Rhiostoma Benson, 1860

Northwest of Lai Châu city, on the way going to Paso, Lai Châu Province (north Vietnam).

Holotype NHMUK 20160307 (Fig. 1A), paratype ANSP 467381 (1 shell).

Pterocyclos Benson, 1832

Abor Hills; Pongping; Rami Lampang [region in Arunachal Pradesh State, India].

Syntype NHMUK 1903.7.1.3104 (3 shells; Fig. 1B, C) from Abor Hills; NHMUK 1903.7.1.3046 (2 shells) from Pongping, Abor; NHMUK 1903.7.1.3050 (3 shells) from Rami Lambang, Abor.

Godwin-Austen’s description was based on three lots of specimens. The original description includes an illustration and one set of measurements. The original description stated “Type no. 3104 Brit. Mus.” There are three specimens from Godwin-Austen type collection that relate to this registration number. The specimen figured in the original description which corresponds to the measurements given is figured herein (Fig. 1B).

Cyclotus Swainson, 1840

N. Borneo [North Borneo].

Syntype NHMUK 1905.4.14.4 (1 shell; Fig. 1D).

The original description did not include an illustration and only one set of shell measurements was given. The author stated “sometime zigzag”, which implied that this taxon was based on more than one specimen. The NHM collections contain a lot comprised of a single specimen purchased from Sowerby and Fulton with a label stating “Type” and with a collection locality written on the original label, this specimen is figured herein.

Cyclotus Swainson, 1840

Amboyna [Ambon Island, Maluku Province, Indonesia].

Lectotype (design. n.) NHMUK 20170352/1 (Fig. 1E), paralectotypes NHMUK 20170352/2–3 (2 shells; Fig. 1F).

The original description lacked mention of an operculum and did not include an illustration, and only one set of shell measurements was given. Pfeiffer (1854a) re-published the description and figured the species which no operculum. There is a lot of four shells from the Cuming collection with two Pfeiffer handwritten labels. The larger label states “C. Amboinensis Pfr.”, “The operculum shows that…” and the collection locality from “Isle of Lobok”. We presume that this lot contains a subsequently introduced specimen that has an operculum. Therefore, the specimen with an operculum attached (NHMUK 20070352/4) is excluded from the type series. The remaining three shells have no operculum and the smaller label states “Cycl. Amboinense Pfr.” and gives the collection locality as “Amboyana”. The specimen that most closely matches with the measurements given in the original description and the illustration in Pfeiffer (1854a) is here designated as the lectotype to stabilise the name.

Pearsonia Kobelt, 1902

ad Bhamo cum praecedente [Bhamo District, Kachin State, Myanmar].

Syntype NHMUK 1906.5.5.77 (3 shells; Fig. 1G, H).

The species description was clearly based on more than one specimen, but an illustration was not included in the original description. Later, the species was figured in Hanley and Theobald (1872). The figured specimen with red wool inside the aperture is illustrated in Figure 1G.

Pterocyclos Benson, 1832

Les environs de Touranne (Cochinchine) [Da Nang City, Vietnam].

Syntype NHMUK 1854.7.24.365 (2 shells; Fig. 1I, J).

The original description included one set of measurements. Later, Eydoux and Souleyet (1852) re-published the description and figured this species. Gray (1855: 19) made a list of type specimens of molluscs described by the late M Souleyet and housed in the NHM collections. There are two specimens with an original label stating the species name and collection locality. The specimen that closely matches the figure in Eydoux and Souleyet (1852) and is closest to the measurements given in the original description is illustrated in Figure 1I.

Pterocyclos Benson, 1832

Loeboek, Bangko [region in Bangko, Merangin Regency, Jambi Province, Indonesia].

Syntype NHMUK 1906.7.21.1 (5 adults + 1 juvenile; Fig. 1K, L).

The original description is clearly based on more than one specimen, but only one set of measurements and illustrations were given. The NHM type collections contain a lot of six shells with the label stating the taxon name, collection locality, and “Type”. The specimen figured in the original description, which is closest to the shell dimensions given in the original description, is illustrated in Figure 1K.

Figure 1. 

A Holotype of Rhiostoma abletti B, C syntype of Pterocyclos aborensis D syntype of Cyclotus amabilis E, F Cyclotus amboinensis E lectotype and F paralectotype G, H syntype of Pearsonia andersoni I, J syntype of Pterocyclos anguliferus K, L syntype of Pterocyclos aspesrus.

Pearsonia Kobelt, 1902

Khasi Hills, Assam [Khasi Hills, Meghalaya State, India].

Syntype NHMUK 1901.4.25.45–46 (2 shells; Fig. 2A, B).

The original description did not include an illustration, and only one set of shell measurements was given. There are two shells in the NHM collection with Fulton’s handwritten label stating “TYPE (larger)”. The larger specimen corresponds to the measurements given in the original description and is illustrated in Figure 2A.

Pearsonia Kobelt, 1902

Shan Hills, east of the town of Ava [Shan Hills, Kyaukse District, Mandalay Region, Myanmar].

Syntype NHMUK 1903.7.1.4198 (1 shell; Fig. 2C).

The species was clearly based on two specimens, one dead and one alive. The original description did not include an illustration and only one set of measurements was given. Subsequently, Hanley and Theobald (1875) figured a specimen of this species. The single specimen in the NHM from the Godwin-Austen collection, ex. WT Blanford collection and figured in Hanley and Theobald (1875) is figured herein.

Cyclotus Swainson, 1840

Ise of Batchian [Bacan Islands, north Maluku Province, Indonesia].

Syntype NHMUK 20170364 (1 adult + 1 juvenile; Fig. 2D).

The original description by Pfeiffer includes an illustration and one set of shell measurements. The type lot in the NHM collections was collected by “Mr. Wallace” and is from the Cuming collection as stated in the original description. It has an original label in Pfeiffer’s handwritings giving the species name and collection locality. The adult specimen that closely matches the measurements and the illustration shown in the original description is figured herein.

Crossopoma Martens, 1891

Borneo.

Holotype NHMUK 1878.1.30.1 (Fig. 2E).

Smith clearly stated that this taxon was described based on a single specimen from the GB Sowerby I collection. The species description included an illustration and a set of shell dimensions. The NHM collections contain a type lot that has an original label stating “Type”, subsequently re-written as “Holotype”. Therefore, we recognise this single shell as the holotype fixed by monotypy.

Pearsonia Kobelt, 1902

Kimeky Hills near Waltair (Vizagapatam), northern division of the Madras Presidency [Visakhapatnam District, Andhra Pradesh State, India].

Syntype NHMUK 1906.1.1.942 (1 shell; Fig. 2F).

The species description was based on more than one specimen. The original description did not include an illustration, and only one set of measurements was given. Hanley and Theobald (1875) subsequently figured this species. There is a specimen in the NHM from the Blanford collection figured in Hanley and Theobald (1875) that closely matches the dimensions given in the original description, it is figured herein.

Pearsonia Kobelt, 1902

Bhamo valle Iravadi Regno Burmanico [Ayeyarwady Valley, Bhamo District, Kachin State, Myanmar].

Syntype NHMUK 1888.12.4.1964 (1 shell; Fig. 2G).

The original description did not include an illustration, and only one set of measurements was given. Gude (1921: 116, 117, fig. 20) re-published the description and figured a type specimen from Theobald’s collection. There is one shell in the NHM collection purchased from W Theobald, with an original label stating “type” and the collection locality “Bhamo”. The specimen figured herein closely matches the measurements given in the original description.

Pterocyclos Benson, 1832

Ceylon [Sri Lanka].

Syntype NHMUK 20170365 (3 shells; Fig. 2H, I).

The species was described based on specimens from the Cuming collection. The original description did not include illustrations, and only one set of measurements was given. Reeve (1863) re-described and illustrated a single specimen from the Cuming collection. There are three specimens from the Cuming collection in the NHM type lot with an original label in Pfeiffer’s handwriting stating the species name and collection locality. The specimen figured in Reeve (1863) closely matches the measurements given in the original description is illustrated here in Figure 2H.

Cyclotus Swainson, 1840

Sarawak, Borneo [Sarawak, Malaysia].

Syntype NHMUK 20170353 (3 shells; Fig. 2J, K).

This species was described based on material from the Cuming collection, and only one set of shell measurements was given. Later, Reeve (1863) re-described the species and illustrated a shell from the Cuming collection. There are three specimens in the NHM collections with an original label stating “Rev C. I. f. 18a–b”. The specimen figured herein (Fig. 2J) is closest to the illustration in Reeve (1863) and the shell dimensions given in the original description.

Pearsonia Kobelt, 1902

Bhamo [Bhamo District, Kachin State, Myanmar].

Syntype NHMUK 1888.12.4.1961 (1 shell; Fig. 2L).

The original description did not include an illustration, and only one set of measurements was given. Gude (1921: 117, 118, fig. 21) re-published the description and figured a shell from Theobald’s collection. There is one shell in the NHM collection purchased from W Theobald, with an original label stating “type” and the collection locality “Bhamo”. This specimen closely matches the measurements given in the original description and is figured herein.

Figure 2. 

A, B Syntype of Pearsonia assamenseis C syntype of Pearsonia avana D syntype of Cyclotus batchianensis E holotype of Crossopoma bathyrhaphe F syntype of Pearsonia beddomei G syntype of Pearsonia bhamoensis H, I syntype of Pterocyclos bifrons J, K syntype of Cyclotus birostris L syntype of Pearsonia bitubifera.

Cyclotus Swainson, 1840

Molu Hills [Gunung Mulu National Park, Miri Division, Sarawak, Malaysia].

Syntype NHMUK 1891.3.17.35 (1 shell; Fig. 3A).

This species was described from the Hungerford collection. An illustration and a set of shell dimensions were given in the original description. Godwin-Austen (1889) does not explicitly indicate the number of specimens he has available to him in the original description. There is a single shell in the NHM collections from the R Hungerford collection with an original label stating “Type”, the species name, and collection locality. This specimen closely matches with the illustration and the shell measurements given in the original description, and it is figured herein.

Rhiostoma Benson, 1860

Near Kina Balu [Mount Kinabalu, Sabah, Malaysia]; Palawan [Palawan Islands, Province of Palawan, Mimaropa Region, Philippines].

Syntypes NHMUK 1894.5.23.1 from near Kina Balu (1 shell; Fig. 3B), NHMUK 1895.12.5.34 from Palawan (1 shell; Fig. 3C).

The original description gives a set of shell measurements and figures of two specimens, so this species is clearly based on more than one specimen. There is a type lot (two shells) with differing registration numbers, one specimen NHMUK 1894.5.23.1 is from R Hungerford ex. Mr. Boxall from Kina Balu and the NHM registration book states “Type”. The other shell, NHMUK 1895.12.5.34, in the same box was collected by Mr. Whitehead from Palawan and agrees well with Godwin-Austen (1893: fig. 1b, c). These two shells form part of the type series and are considered as syntypes.

Pterocyclos Benson, 1832

Brahmakund, eastern Assam [Parshuram Kund, Lohit District, Arunachal Pradesh State, India].

Syntype NHMUK 1903.7.1.713 (3 shells; Fig. 3D, E).

Godwin-Austen clearly stated that the original description was based on a lot of three shells “Type No. 713 B.M.”. The NHM type collections contain a lot of three shells from the Godwin-Austen collection and original label states “TYPE”. The specimen with red wool inside the aperture that corresponds to the illustrations and measurements given in the original description, and it is figured herein (Fig. 3D).

Scabrina Blanford, 1863

Nuwara–Eliya [Nuwara Eliya District, Central Province, Sri Lanka].

Holotype NHMUK 1903.7.17.3 (Fig. 3F).

Sykes clearly stated that this taxon was described based on a single specimen collected by Mrs. Broun. The original description included an illustration and a set of shell measurements. The NHM collections contain a Sykes type lot that has an original label stating “Type”, and so we recognise this single illustrated specimen as the holotype fixed by monotypy.

Scabrina Blanford, 1863

ad Akaouktong, prope ripas fluminis Irawadi [Akauk Taung (Hill), Padaung Township, Pyay District, Bago Region, Myanmar].

Syntype NHMUK 1954.6.2.1542–1544 (3 shells; Fig. 3G, H).

The original description did not include an illustration or state the number of specimens examined and there is no information concerning the operculum, however one set of shell measurements were given. Later, Pfeiffer (1860b) and Reeve (1861) re-published the description and figured the species from specimens in the Benson collection. There is a type lot in the NHM ex. Hawkins collection containing three shells (1 with and 2 without periostracum). The specimen without periostracum that most closely matches with the measurements given in the original description and the illustrations in Pfeiffer (1860b: pl. 37, figs 25–27) and Reeve (1861: pl. 20, species 104) is figured herein (Fig. 3G).

Rhiostoma Benson, 1860

Battambang, Cambodje [Battambang Province, Cambodia].

Syntype NHMUK 1893.2.4.766 (1 shell; Fig. 3I).

The original description includes an illustration and one set of shell measurements is given. However, the species description was not clearly based on a single specimen. Only one shell was found in the NHM collections with an original label stating “Type” and giving the reference of the original description and collection locality. This figured specimen exactly matches with the illustration and shell measurements given in the original description.

Pterocyclos Benson, 1832

South Celebes, 2000–4000 feet [South Sulawesi Province, Indonesia].

Syntype NHMUK 1896.5.1.3 (2 shells; Fig. 3J, K).

There are two specimens in the type lot with original labels in Smith’s handwriting stating “Type”. The original description gives one set of measurements and illustrates one specimen. The specimen that corresponds to the illustrations in Smith (1896b: figs 4–6) and the given shell measurements in the original description and has a red spot on the last whorl is figured herein (Fig. 3J).

Figure 3. 

A Syntype of Cyclotus boxalli B, C syntype of Rhiostoma boxalli D, E syntype of Pterocyclos brahmakundensis F holotype of Scabrina brounae G, H syntype of Scabrina calyx I syntype of Rhiostoma cambodjense J, K syntype of Pterocyclos celebensis L holotype of Rhiostoma christae.

Cyclotus Swainson, 1840

Hong Kong, China.

Syntype NHMUK 198040 (3 shells; Fig. 4A, B).

The original description did not include an illustration, and one set of shell measurements was given. Later, Reeve (1862) re-published the description and figured a shell from the Cuming collection. There is one lot from the Cuming collection containing three specimens collected by Mr. Fortune with an original label in Pfeiffer’s handwriting stating the species name and collection locality. The specimen that most closely matches the measurements given in the original description and the illustration in Reeve (1862) is figured herein (Fig. 4A).

Rhiostoma Benson, 1860

Near the road No. 6 to Chieng Ngan, Son La Province (north Vietnam).

Holotype NHMUK 20160306 (Fig. 3L), paratype ANSP 467386 (1 shell).

Rhiostoma Benson, 1860

Bukit Chuping, Perlis, Malaysia.

Lectotype (design. n.) NHMUK 1938.10.25.1 (Fig. 4C), paralectotypes NMW 1955.158.01101 (3 shells) and NMW.Z 1981.118.02703 (1 shell).

The original description was clearly based on more than one specimen, and included an illustration and one set of shell measurements. There is only one specimen in the NHM type collections with Tomlin’s hand written label stating “Type” and the collection locality. This specimen exactly matches with the illustration (not full adult stage) and the measurements given in the original description and is here designated as the lectotype to stabilise the name. The other two lots of Tomlin collections in the NMW with the label stating “paratype” are therefore considered as paralectotypes.

Cyclotus Swainson, 1840

Cochinchina [south of Vietnam].

Probable syntype NHMUK 20170354 (1 shell; Fig. 4D).

This species was described from specimens in the Cuming collection and only one set of shell measurements was given in the original description. The NHM collections contains a lot of a single shell from the Cuming collection with an original label, probably in Pfeiffer’s handwriting, stating the species name, however this has subsequently been overwritten. Reeve (1863) illustrated a single specimen from the Cuming collection. This single specimen closely matches the illustration in Reeve (1863) but is slightly larger than the shell dimensions given in the original description. Therefore, we consider this specimen to be a probable syntype.

Pterocyclos Benson, 1832

Anaamullays.

Lectotype (designated by Raheem et al. 2014), NHMUK 1912.04. 16.669/1 (Fig. 4E), paralectotypes NHMUK 1912.04.16.669/2 (2 shells), SMF 130504 (4 shells).

One lot of four specimens SMF 130504/4 in Möllendorff ex. Beddome collection from “Anamullay–Berge” and labelled “Cotypen” are considered as paralectotypes.

Cyclotus Swainson, 1840

Borneo.

Syntype NHMUK 20170355 (1 shell; Fig. 4F).

The species description by Pfeiffer did not indicate the number of available specimens and did not include an illustration. Only one set of shell measurements was given in the original description. Reeve (1861) re-published the description and figured one specimen from the Cuming collection. The NHM collections contain a lot containing one shell with Pfeiffer’s handwritten label giving the species name and collection locality. This figured shell matches well with the measurements given in the original description and the figure in Reeve (1861).

Pterocyclos Benson, 1832

Niah Hills [Niah National Park, Miri Division, Srawak, Malaysia].

Syntype NHMUK 1889.12.7.17 (1 shell; Fig. 4G).

The original description included an illustration and one set of shell measurements. Only one specimen is housed in the NHM type collections, with an original label stating “Type”. This shell closely matches the illustration and the measurements given in the original description.

Pterocyclos Benson, 1832

insula Ceylon [Sri Lanka].

Lectotype (designated by Raheem et al. 2014) NHMUK 20110220/1 (Fig. 4H).

Rhiostoma Benson, 1860

Juxta Phitsanulok, in sylvis humidis et densis [Phitsanulok Province, Thailand].

Syntype NHMUK 1902.1.24.14–16 (3 shells; Fig. 4I, J).

This species was described from specimens collected by Mr. WM. Daly from Thailand. The original description included an illustration and a set of shell dimensions. The NHM collections contain a lot of three specimens collected by Mr. Daly and have an original label stating the species name and collection locality. The specimen which is identical to the illustration, particularly in respect to the breathing device, and the shell measurements given in the original description is figured herein (Fig. 4I).

Cyclotus Swainson, 1840

Salomon’s Islands [Solomon Islands].

Syntype NHMUK 20170356 (2 shells; Fig. 4K, L).

This species was described from material in the Cuming collection, and the original description included only one set of shell dimensions. Reeve (1863) re-described the species and illustrated a shell from the Cuming collection. The NHM collections contain a lot of two specimens from the Cuming collection with Pfeiffer’s hand written label giving the species name and collection locality. The specimen that corresponds to the shell measurements in the original description and the illustration in Reeve (1863) is figured herein (Fig. 4K).

Figure 4. 

A, B Syntype of Cyclotus chinensis C lectotype of Rhiostoma chupingense D probable syntype of Cyclotus cochinchinensis E lectotype of Pterocyclos comatus F syntype of Cyclotus confluens G syntype of Pterocyclos cucullus H lectotype of Pterocyclos cumingi I, J syntype of Rhiostoma dalyi K, L syntype of Cyclotus daucinus.

Cyclotus Swainson, 1840

Kelantan, Malay Peninsula [Kelantan, Malaysia].

Syntype NHMUK 20170357 (3 shells; Fig. 5A, B).

The species description does not include an illustration, but later, Sykes (1902b) cited the species name and illustrated a shell of this taxon. The NHM collections contain a lot of three specimens from the Sykes collection. There is a specimen that exactly matches with the illustration in regard to the brownish zigzag streaks on the last whorl, and with the shell measurements given in the original description plus it has “Type” written on the shell. It is figured herein (Fig. 5A).

Pterocyclos Benson, 1832

Tam Sumano, Patthalung, Thailand (7°35'183"N, 99°52'80"E).

Holotype CUMZ 4595. Paratypes CUMZ 4588 (11 specimens in ethanol), NHMUK 20150078 (2 shells, Fig. 5C).

Cyclotus Swainson, 1840

Demerara.

Syntype NHMUK 20170358 (2 shells; Fig. 5D, E).

The original description and illustration in Sowerby I (1843a) as well as those in Pfeiffer (1849) and Reeve (1863) are particularly accurate, both showing the varices on the last whorl, which suggests that these figures are from the same specimen. The NHM collections contain a lot of two shells from the Cuming collection with original labels stating the taxon name and collection locality. The specimen that corresponds to the illustrations in Sowerby I (1843a), Pfeiffer (1849) and Reeve (1863) is figured herein (Fig. 5D).

Crossopoma Martens, 1891

Engano [Engano Island, north Bengkulu Regency, Bengkulu Province, Indonesia].

Syntype NHMUK 1898.12.5.40–41 (2 shells; Fig. 5F, G).

The original description included an illustration and a set of shell measurements. The species description was based on more than one specimen. There are two shells in the NHM type collections with an original label stating “Type lot”, taxon name, and collection locality. The specimen that matches well with the illustration and the shell dimensions given in the original description is figured herein (Fig. 5F).

Cyclotus Swainson, 1840

Borneo.

Syntype NHMUK 20170351 (3 shells; Fig. 5H, I).

This species was described based on specimens from the Cuming collection, and was not illustrated in the original description. Reeve (1863) re-published the description and figured a specimen from the Cuming collection. The NHM collections contain a lot of three shells from the Cuming collection with a label in Pfeiffer’s hand written label stating the taxon name and collection locality. The specimen which closely matches the illustration in Reeve (1863) and the shell measurements given in the original description is figured herein (Fig. 5H).

Pearsonia Kobelt, 1902

In montibus Pulney dictis, Indiae meridionalis [Pulney Mountains, south India].

Lectotype (designated by Raheem et al. 2014) NHMUK 1906.05.05.79/1 (Fig. 5J).

Figure 5. 

A, B Syntype of Cyclotus dautzenbergi C paratype of Pterocyclos diluvium D, E syntype of Cyclotus discoideus F, G syntype of Crossopoma enganoense H, I syntype of Cyclotus euryomphalus J lectotype of Pearsonia fairbanki K, L syntype of Cyclotus fortunei.

Pterocyclos Benson, 1832

Thayet Myo, Pegu [Thayet District, Magway Division, Myanmar].

Syntype NHMUK 1906.4.4.79 (1 shell; Fig. 6A).

The original description did not clearly state how many specimens were available to the author, although only one set of measurements was given. The NHM collections contain a lot comprising one specimen and an original label stating that the specimens were figured in the Conchologia Indica. This specimen matches well with the figures in Hanley and Theobald (1875: pl. 5, fig. 9, pl. 134, fig. 1), and the measurements given in the original description.

Cyclotus Swainson, 1840

Shanghi, China [Shanghai Municipality, China].

Syntype NHMUK 1980121 (1 adult + 1 juvenile; Fig. 5K, L).

This species was described from specimens in the Cuming collection and only one set of shell measurements was given in the original description. Pfeiffer (1854a) re-published the description and figured a specimen from the Cuming collection. The NHM collections contain a lot of two specimens with a label stating “Type”. The adult specimen that matches well with the illustrations in Pfeiffer (1854a) and Reeve (1863), and the shell dimensions given in the original description, is figured herein (Fig. 5K).

Pterocyclos Benson, 1832

Bukit Chintamanis, Pahang, Malaysia (03°26.798'N, 102°00.987'E).

Holotype CUMZ 4594. Paratypes CUMZ 4581 (18 specimens in ethanol), 4571 (29 shells), NHMUK 20150077 (2 shells, Fig. 6B).

Cyclotus Swainson, 1840

Niah Hills [Niah, Srawak, Malaysia].

Holotype NHMUK 1889.12.7.9 (Fig. 6C).

Godwin-Austen clearly stated this taxon was described based on only a single specimen collected by A Everett. The original description included an illustration and a set of measurements. The NHM collections contain a Godwin-Austen type lot with an original label stating “Type”, and so we recognise this illustrated shell as the holotype fixed by monotypy.

Cyclotus Swainson, 1840

Hainan [Hainan Province, China].

Syntype NHMUK 1878.1.28.19 (3 shells; Fig. 6D, E).

Adams’s description was based on specimens collected by Mr. Swinhoe from Hainan. The original description gives both a set of shell measurements and an illustration of a specimen. The NHM collections contain a lot of three specimens from the H Adams collection with an original label stating the taxon name and collection locality. The specimen marked with an “x” on the shell matches well with the shell dimensions and illustration given in the original description and it is figured herein (Fig. 6D).

Rhiostoma Benson, 1860

Camboja [Cambodia].

Syntype NHMUK 20170371 (2 shells; Fig. 6F, G).

This species was described based on material in the Cuming collection, and Pfeiffer provided an illustration and a set of measurements. The NHM type lot contains two shells collected by H Mouhot and is from the Cuming collection. It has an original label in Pfeiffer’s handwriting giving the taxon name, the collector as “Mr. Mouhot” and collection locality. The specimen that most closely matches the illustration and shell measurements given in Pfeiffers (1862) description is figured herein (Fig. 6F).

Cyclotus Swainson, 1840

Krabi, south Thailand [Krabi Province, Thailand].

Holotype NHMUK 20180248 (Fig. 6H).

The shell characters of an expanded apertural lip and a small accessory breathing device (sutural tube) located in the suture closest to the aperture suggest that it is a member of the genus Cyclotus. It is very closely resembles the widespread species Cyclotus setosus (Möllendorff, 1894) in the southern Thailand.

Scabrina Blanford, 1863

Mya Leit Doung, near Ava [Myaleit Mountains, Pyinoolwin and Kyaukse Townships, Pyinoolwin and Kyaukse Districts, Mandalay Region, Myanmar].

Syntype NHMUK 1906.4.4.88 (5 adults + 2 juveniles; Fig. 6I, J).

The original description did not include an illustration, and only one set of shell measurements was given. Subsequently, Hanley and Theobald (1872) figured a specimen of this species. There is a specimen in the NHM collections from the Blanford collection which was figured in Hanley and Theobald (1872) and matches well with the dimensions given in the original description, and it is figured herein (Fig. 6I).

Pearsonia Kobelt, 1902

Thanh area, Dien Khanh District, Khanh Hao Province, Vietnam.

Holotype NHMUK 20160302 (Fig. 6K).

Cyclotus Swainson, 1840

Molu Hills, Borneo [Gunung Mulu, Sarawak, Malaysia].

Holotype NHMUK 1891.3.17.33 (Fig. 6L).

Godwin-Austen clearly stated that this taxon was described based on only one specimen from the R Hungerford collection. There is one specimen in the NHM collections that has an original label stating “Type”. We recognise this specimen as the holotype fixed by monotypy.

Figure 6. 

A Syntype of Pterocyclos feddeni B paratype of Pterocyclos frednaggsi C holotype of Cyclotus gwendolenae D, E syntype of Cyclotus hainanensis F, G syntype of Rhiostoma hainesi H holotype of Cyclotus harryleei I, J syntype of Scabrina hispidula K holotype of Pearsonia huberi L holotype of Cyclotus hungerfordi.

Scabrina Blanford, 1863

Damotha, prope Moulmein [Dhammatat Cave, Mawlamyine Township, Mawlamyine District, Mon State, Myanmar].

Possible syntype NHMUK 20170363 (1 shell; Fig. 7A).

The species description included an illustration and one set of shell measurements. There is a shell in the NHM collections from the Blanford collection, with an original label stating “figd. Conch. Ind. 143, f. 8, 9” and the collection locality “Damatha, Molmein”. This specimen matches with the shell dimensions given in the original description but lacks an operculum. Therefore, we consider this lot to be a possible syntype.

Pterocyclos Benson, 1832

Shan State [Myanmar].

Lectotype (design. n.) NHMUK 1888.12.4.1967 (Fig. 7B).

The species description was very brief and only one set of measurements was given. The NHM collections contain a mixed-species lot consisting of two specimens with an original label stating “Type”. The specimen that matches with the figures in Hanley and Theobald (1870: pl. 5, figs 6, 7), the measurements (width 29.6 mm) given in the original description and marked with an “x” is here designated as the lectotype to stabilise the name.

The other shell, NHMUK 1888.12.4.1977, differs from the lectotype in having a smaller shell width (23.6 mm), shallow suture without a canal-like structure and an expanded apertural lip without a canal-like accessory respiratory structure. We considered this shell as a distinct species, and so it excludes it from the type series.

Cyclotus Swainson, 1840

Borneo.

Syntype NHMUK 1891.3.17.34 (1 shell; Fig. 7C).

The original description gave the measurements for only one shell and did not include an illustration. The NHM collections contain a lot of one specimen from the R Hungerford collection with an original label stating “Type” and giving the collection locality as “Borneo”. This specimen matches well with the original description and shell dimensions given.

Pearsonia Kobelt, 1902

Abor Hills and Ponging [in the area of Arunachal Pradesh State, India].

Syntype NHMUK 1903.7.1.3105 from Abor Hill (2 shells; Fig. 7D), NHMUK 1903.7.1.3047 from Ponging (2 shells; Fig. 7E).

Godwin-Austen’s description clearly indicated that the type series was from two collection localities “Abor Hills” and “Pongping”, and he provided illustrations of two shells from each different specimen lot. These two specimen lots were listed as being housed in the NHM collections. These two type lots have an original label in Godwin-Austen’s handwriting stating species name, collection locality and giving his own catalogue numbers. The figured specimen (Godwin-Austen 1915: figs 4, 4a) labelled as “Type”, is figured herein (Fig. 7D). Another figured shell (Godwin-Austen 1915: figs 5, 5a) labelled as “Typic.” is also figured herein (Fig. 7E). In addition, the original description states ‘Two specimens to Indian Museum’.

Cyclotus Swainson, 1840

In insula Labuan [Federal Territory of Labuan, Malaysia].

Syntype NHMUK 20170369 (3 shells; Fig. 7F, G).

The species was described based on material from the Cuming collection. The original description did not include an illustration and only one set of shell dimensions was given. Pfeiffer (1869) re-published the description and illustrated a specimen. The NHM collections contain a lot of three shells from the Cuming collection with a label stated “Type”. The specimen that closely matches with the shell measurements, the illustration in Pfeiffer (1869) and has an “X” written on the shell, is figured herein (Fig. 7F).

Pterocyclos Benson, 1832

Gomanton Hill, N. Borneo [Gomantong Hill, Sandakan Division, Sabah, Malaysia].

Syntype NHMUK 1892.7.20.85–87 (3 shells; Fig. 7H, I).

Smith based this taxon on more than one specimen since the author states “most of the specimens”. The original description includes an illustration but no shell measurements are given. The type lot in the NHM collections contain three specimens with an original label in Smith’s handwriting. The specimen that most closely matches the illustrations in the original description is figured herein (Fig. 7H).

Cyclotus Swainson, 1840

Nusa Penida [Nusa Penida Island, Klungkung Regency, Bali Province, Indonesia].

Holotype RMNH.MOL 57140, paratypes RMNH.MOL58921 (25 shells), NHMUK 20000249 (1 shell; Fig. 7J)

Cyclotus Swainson, 1840

Mount Ophir, Malacca [Gunung Ledang National Park, Tangkak District, Johor, Malaysia].

Syntype NHMUK 20170359 (1 adult + 2 juveniles; Fig. 7K, L).

The species description did not include an illustration, and only one set of shell measurements were given. Reeve (1863) re-published the description and illustrated an adult specimen from the Cuming collection. The NHM collections contain a lot of three shells collected by FW Lindstedt from the Cuming collection with a label in Pfeiffer’s handwritten stating the taxon name and collection locality. The adult specimen matches well with the shell dimensions given in the original description, the illustration in Reeve (1863), and is figured herein (Fig. 7K).

Figure 7. 

A Possible syntype of Scabrina inglisianus B lectotype of Pterocyclos insignis C syntype of Cyclotus iris D, E syntype of Pearsonia kempi F, G syntype of Cyclotus labuanensis H, I syntype of Pterocyclos latilabrum J paratype of Cyclotus lepidotus K, L syntype of Cyclotus lindstedti.

Cyclotus Swainson, 1840

Rinjani Peak, 2,500 ft [at 2500 ft., Gunung Rinjani, Lombok Island, west Nusa Tenggara Province, Indonesia].

Lectotype (design. n.) NHMUK 1897.3.13.59 (Fig. 8A).

The species description was not explicitly based on one specimen, but only a single shell was illustrated and just one set of shell measurements was given in the original description. The NHM type lot contains one specimen with an original label in Smith’s handwriting and a label stating “Type”, subsequently changed to “Holotype”. This is not a valid holotype designation (ICZN 1999: Art. 73.1 and Recommendation 73F). This specimen matches well with the illustration and the shell measurements given in the original description, and is designated here as the lectotype to stabilise the name.

Cyclotus Swainson, 1840

In insula Labuan [Federal Territory of Labuan, Malaysia].

Syntype NHMUK 20170350 (3 shells; Fig. 8B, C).

This species was described based on specimens collected by H Low from the Cuming collection. In the original description, only one set of shell measurements was given. In 1869, Pfeiffer re-described and illustrated a single specimen from the Cuming collection. The NHM collections contain a lot of three shells from the Cuming collection with Pfeiffer’s handwritten label stating the taxon name, collector and collection locality. The specimen that matches well with the shell dimensions in the original description and the illustrations in Pfeiffer (1869) is figured herein (Fig. 8B).

Pearsonia Kobelt, 1902

Luyor, Abor Hills [in the area of Arunachal Pradesh State, India].

Syntype NHMUK 1903.7.1.3530 (1 shell; Fig. 8D).

Godwin-Austen’s description was not clearly based on only one specimen. The original description included an illustration and one set of measurements were given. The author stated that one lot of the type series was housed in the NHM collections. The specimen NHMUK 1903.7.1.3530 has a label in Godwin-Austen’s handwriting stating “Type” and exactly matches the measurements and illustrations given in the original description.

Myxostoma Troschel, 1847

In insula Poulo-Condor [Con Son Island, Ba Ria–Vung Tau Province, Vietnam].

Lectotype NHMUK 1893.2.4.501 (Fig. 8E), paralectotype NHMUK 1893.2.4.502–503 (2 shells; Fig. 8F).

The original description by Morelet (1862: 478) did not give an illustration of the species, although a set of shell dimensions was provided. The NHM register show that a lot of three specimens was purchased from Fulton from the A Morelet collection. The original label states the taxon name and gives the collection locality as “C. breve Martyn–lychnus Moret. I. Pulo Condor”. The words “All too small for types” was added at a later date, however, our measurements of all specimens are close to those shell dimensions given in the original description (width 36 mm, height 25 mm). The specimen that matches well with the shell dimensions given in the original description is here designated as the lectotype to stablise the name.

Rhiostoma Benson, 1860

Sungei Siput, Perak [Sungai Siput, Kuala Kangsar District, Perak, Malaysia].

Lectotype (design. n.) NHMUK 1939.4.13.23 (Fig. 8G).

The original description does not clearly state how many specimens were available to the author. Laidlaw’s use of the term “Type specimen in my collection” does not constitute a valid holotype designation (ICZN 1999: Art. 73.1.1, 73.2 and Recommendation 73F). The NHM collections hold a lot containing one specimen, NHMUK 1939.4.13.23, with a label in Laidlaw’s handwriting stating the taxon name, collection locality and “From type series”. It has subsequent been incorrectly labeled as a “Paratype”. To avoid the assumption of the existence of a holotype (ICZN 1999: Recommendation 73F), this specimen is here designated as the lectotype to stabilise the name.

Pterocyclos Benson, 1832

Dafla Hills, Assam [India].

Syntype NHMUK 1903.7.1.1491 (1 shell; Fig. 8H).

This species was clearly described based on more than one specimen since the author stated “largest example”. The NHM collections contain a lot containing a single specimen with an original label in Godwin-Austen’s handwriting stating “Type”. This specimen matches well with the illustration and the measurements given in the original description.

Pterocyclos Benson, 1832

Naga Hills [Assam, Arunachal Pradesh and Nagaland states, India].

Syntype RBINS 524550 (1 shell; Fig. 8I), NHMUK 1911.10.12.20–21 (2 shells; Fig. 8J).

A unique name bearing type was not explicitly designated and the species description was not clearly based on one specimen. The original description included a single illustration and one set of shell measurements. The RBINS collections contain a lot with one specimen from the collection of P Dautzenberg with an original label stating “Type” and “fig.”. This specimen matches well with the shell measurements given in the original description and is figured herein (Fig. 8I). The NHM collections also contain another lot of two specimens with an original label stated “co-types”, and are also considered to be syntypes.

Figure 8. 

A Lectotype of Cyclotus lombockensis B, C syntype of Cyclotus lowianus D syntype of Pearsonia luyorensis E, F Myxostoma lychnus E lectotype and F paralectotype G lectotype of Cyclotus macalpinewoodsi H syntype of Pterocyclos magnus I, J syntype of Pterocyclos marionae K, L syntype of Cyclotus mindaiensis.

Pearsonia Kobelt, 1902

in montibus Naga dictis, ad latus meridionale province Assam, haud procul a Golaghat [Naga Hills, Golaghat District, southern of Assam State, India].

Syntype NHMUK 1888.12.4.1957 (1 shell; Fig. 9A) from Gholaghta, Assam.

This taxon was first published in Hanley and Theobald (1870), who attributed the name to WT Blanford as a manuscript name. However, Hanley and Theobald (1870: 3) did not provide any description or definition of the taxon, only a figure was provided, which does not meet the requirements of the ICZN (1999: Art. 12.2). Therefore, this taxon name was not made available. Pfeiffer (1876: 386) mentioned the taxon name without further description or definition, and so again the was not made available. Blanford (1877) published a complete description of this taxon under the same name and so making it available. Therefore, the type series is made up of the specimens sent by Blanford and cited and figured in Hanley and Theobald (1870: pl. 5, fig. 1), along with the specimens mentioned by Blanford (1870). Coan and Kabat (2012: 326) could not trace the specimen figured in Hanley and Theobald (1870: pl. 5, fig. 1). However, the NHM collections hold a lot containing a single shell from the WT Blanford collection with a handwritten label stating the taxon name, and the collection locality “Gholaghat, Assam”. This specimen matches well with the original description and the set of shell dimensions, and is considered as the syntype and figured herein.

Cyclotus Swainson, 1840

Mindai (Amontai district) [Amuntai, Hulu Sungai Utara, South Kalimantan Province, Indonesia].

Syntype NHMUK 1881.6.6.18–21 (3 adults + 1 juvenile; Fig. 8K, L).

In the original description, Bock illustrates two specimens (an adult and a juvenile), although only one set of shell measurements were given. There are four specimens in the NHM type lot from the Bock collection with an original label stating “Types”. The adult specimen, marked with an “x” matches well with the shell dimensions and illustration given in the original description (Bock 1881: fig. 8) and is figured herein (Fig. 8K).

Pearsonia Kobelt, 1902

Jeku, Abor Hills and Sibbum, Abor Hills [Doje Jeku and Sibbum Villages, west Siang District, Arunachal Pradesh State, India].

Lectotype (design. n.) NHMUK 1903.7.1.3145/1 (Fig. 9B) from Sibbum, Abor Hills, paralectotypes NHMUK 1903.7.1.3145/2–3 (2 shells; Fig. 9C), NHMUK 1903.7.1.3147 from Sibbum, Abor Hills (2 shells).

Godwin-Austen (1915) clearly states that this taxon was based on at least four lots of specimens from two different localities. The original description included illustrations and one set of measurements. In addition, Godwin-Austen (1915) stated that two lots were housed in the Indian Museum, and the other two lots were housed in the NHM. The specimen lot NHMUK 1903.7.1.3145 consisting of three shells has a label in Godwin-Austen’s handwriting stating “Typical”, and gives the collection locality “Sibbum”, and one of the specimens closely matches the original description. This specimen is here designated as the lectotype to stabilise the name.

The paralectotypes are the two remianing shells, NHMUK 1903.7.1.3145/2–3, from the same lot as the lectotype, the two specimens in lot NHMUK 1903.7.1.3147, and the remianing two specimen lots (nos. 6142 and 6143) housed in the Zoological Survey of India (formerly the Indian Museum) as indicated by the author. Following this lectotype designation, the type locality of this species is restricted to “Sibbum, Abor Hills” (ICZN 1999: Art. 76.2).

Cyclotus Swainson, 1840

Under decayed leaves at Calauang in Luzon [Calauan, Laguna Province, Philippines].

Syntype NHMUK 1842.5.10.790–798 (6 adults + 3 juveniles; Fig. 9D, E).

The species name was made available in volume 1 of the Thesaurus Conchyliorum, (Sowerby I 1843a; for date of publication see Petit (2009)). The original description includes an illustration, and the author clearly stated the taxon was described based on specimens collected by H Cuming. The NHM collections contain a lot of nine shells that have a label stating the type collection locality ‘Calauang, Luzon’. The NHM registration records show that this lot was purchased from the H Cuming collection. The specimen that closely matches with the original description and illustration in Sowerby I (1843a) is figured herein (Fig. 9D).

Pearsonia Kobelt, 1902

Maokokchung, Naga Hills [Mokokchung District, Nagaland State, India].

Lectotype (design. n.) NHMUK 1903.7.1.2783 (Fig. 9F), paralectotypes NHMUK 1912.4.16.644 (3 shells; Fig. 9G).

The original description did not contain any illustrations, and only one set of measurements was given. Godwin-Austen stated that the type series was from the Beddome collection. The NHM collections contain two lots that are considered to constitute the type series. Lot NHMUK 1903.7.1.2783 consists of a single specimen, collected by Muspratt, from the Godwin-Austen collection and has original labels giving the species name “nagaensis”, type collection locality and stating “TYPE”. This specimen is here designated as the lectotype to stabilise the name.

The paralectotypes consist of a lot of three shells, NHMUK 1912.4.16.644, from the Beddome collection, collected by Muspratt, with an original label stating the species name “nagaense”, type collection locality, the reference of the original description and is marked as “PARATYPES”.

Cyclotus Swainson, 1840

Banguran [Bunguran Islands, Riau Islands Province, Indonesia].

Syntype NHMUK 1894.2.1.43–44 (2 shells; Fig. 9H, I), NHMUK 1894.2.2.3–4 (2 juveniles).

The original description included an illustration and one set of shell measurements. The NHM collections contain a lot of four shells collected by A Everett from Smith’s collection with an original label stating taxon name, type collection locality, and “Type”. The specimen that matches well with the illustration and shell dimensions given in the original description is figured herein (Fig. 9H).

Pearsonia Kobelt, 1902

near Dihiri Parbat, on the outer sandstone range [Hari Parbat, Srinagar District, Jammu and Kashmir State, India].

Lectotype (design. n.) NHMUK 1903.7.1.2775/1 (Fig. 9J) and paralectotype NHMUK 1903.7.1.2775/2 (1 shell; Fig. 9K).

The species description clearly stated that the taxon was based on two specimens from Dihiri Parbat. An illustration and one set of measurements were given in the original description. The NHM type collection contains one lot, consisting of two shells with Godwin-Austen’s handwritten label stating “Type”. The specimen figured in the original description that is closest to the given measurements is here designated as the lectotype to stabilise the name.

Godwin-Austen (1915: 497, 498) also recognised two varieties as “var.” and “var. large”. Nevertheless, these two varietal names have never been made available. There are two lots of specimens labeled as “var.” and “var. large” housed in the NHM general collections, NHMUK 1903.7.1.3531 (3 shells) and NHMUK 1903.7.1.3089 (4 shells) respectively. They are excluded from the type series of this nominal species (ICZN 1999: Art. 72.4.1).

Figure 9. 

A Syntype of Pearsonia mastersi B, C Pearsonia minima B lectotype and C paralectotype D, E syntype of Cylotus mucronatus F, G Pearsonia nagaensis F lectotype and G paralectotype H, I syntype of Cyclotus natunensis J, K Pearsonia nevilli J lectotype and K paralectotype L syntype of Cyclotus niasensis.

Pterocyclos Benson, 1832

Niah Hills [Niah National Park, Miri Division, Sarawak, Malaysia].

Syntype NHMUK 1889.12.7.16 (1 shell; Fig. 10B), NHMUK 1890.7.15.2 (1 shell; Fig. 10C).

Godwin-Austen described this species based on material from A Everett. The NHM collections contain a lot of two shells from the A Everett collection with an original label stating “Type”. The specimen which corresponds to the illustrations and shell dimensions given in the original description, and marked with an “X”, is figured herein (Fig. 10B).

Godwin-Austen also described a varietal form “var. depressa” from “Molu Hills” based on specimens collected by Mr. Boxall, ex. R Hungerford collection. The type series of the taxa could not be traced in the NHM collections.

Cyclotus Swainson, 1840

Nias Island, Sumatra [Nias Island, north Sumatra Province, Indonesia].

Syntype NHMUK 1907.5.3.131–133 (3 shells; Figs 9L, 10A).

The original description included an illustration and gave one set of shell measurements. There are three specimens in the type lot with an original label in Fulton’s handwriting stating “Type”. The specimen that has a small label stating “Type.” glued on top of the shell matches well with the measurements and figures given in the original description, is figured herein (Fig. 9L).

Pearsonia Kobelt, 1902

Abor Hills [region in Arunachal Pradesh State, India].

Syntype NHMUK 1903.7.1.3081 (3 adults + 2 juveniles; Fig. 10D, E).

The author indicated that five specimens were examined, and the original description included an illustration and one set of measurements. The NHM type collections contain a lot of five specimens with a label in Godwin-Austen’s handwritingstating “Type”. The specimen with red wool inside the aperture, illustrated in the original description and very close to the given measurements, is figured herein (Fig. 10D). The other two specimens housed in the Zoological Survey of India (no. 3081) are also considered as syntypes.

Cyclotus Swainson, 1840

Unknown.

Possible syntype NHMUK 20170360 (4 shells; Fig. 10F, G).

The original description was published by Sowerby I in 1843 and included and illustation. Later, Pfeiffer (1849) and Reeve (1862) re-published the description and figured this species based on material from the Cuming collection. The NHM collections contain a lot of four shells from the Cuming collection with original labels giving only the taxon name. However, the collection locality “Flores (Martens in litt.)” has been subsequently added. The specimens in the Cuming collection matches well with the illustration in the original description, especially in regard to the dark brown reticulated pattern and dark spiral band on the periphery of last whorl. However, Sowerby I (1843a) did not explicitly state that the species description was based on specimens from the Cuming collection. Therefore, we consider this lot to be possible syntypes.

Cyclotus Swainson, 1840

Unknown.

Lectotype (design. n.) NHMUK 20170361/1 (Fig. 10H), paralectotypes NHMUK 20170361/2–3 (2 shells; Fig. 10I).

Reeve (1863) erroneously replaced the previously available name “pterocycloides Pfeiffer, 1855” with “anomalus Reeve, 1863”. This unnecessary substitution is therefore made available with it own authorship and date and is considered to be a junior objective synonym (ICZN 1999: Arts. 19.1, 33.2, 50.5 and 60.1).

Pfeiffer (1855a) stated that this species was described based on specimens from the Cuming collection. The original description did not include an illustration or collection locality, and only one set of shell measurements were given. The type lotcontains four specimens of the same species, however an original label records that this is a mixed lot containing three specimens from the Cuming collection and 1 specimen with an operculum presented by GB Sowerby I. Specimen NHMUK 20170361/1 has no operculum, is without collection locality but has an original label in Pfeiffer’s handwriting stating “Cyclost. pterocycloides Pfr.”. This specimen, that matches with the description and shell measurements given in the original description, and the illustration in Reeve (1863), is here designated as the lectotype to stabilise the name. The other two shells, NHMUK 20170361/2–3, from the Cuming collection lot therefore become the paralectotypes.

The remaining a single shell with an operculum, NHMUK 1886.9.10.1, which was presented by GB Sowerby I and has the collection locality “Borneo”is excluded from the type series.

Figure 10. 

A Syntype of Cyclotus niasensis B, C syntype of Pterocyclos niahensis D, E syntype of Pearsonia oakesi F, G possible syntypes of Cyclotus politus H, I Cyclotus pterocycloides H lectotype and I paralectotype J, K syntype of Pearsonia putaoensis.

Pterocyclos Benson, 1832

Pooree (=Puri) [Puri District, Odisha State, India] and Chandbally [region in Odisha State, India].

Possible syntype NHMUK 1912.4.16.658 (1 shell; Fig. 11A) from Puri, Orissa.

The author clearly indicated that this taxon was described based on material from Pooree (=Puri) and Chandbally. The original description does not include any illustrations or shell measurements, and the species description is very brief, simply indicating that this taxon is a “dwarf form with raised spire…”. The NHM collections contain a lot containing one shell from the Beddome collection with an original label stating collection locality as “Puri, Orissa”. Since this lot was registered as “Nev. Hnd. List. p. 260”, we consider this shell to be a possible syntype.

Pearsonia Kobelt, 1902

Putao, Upper Burma [Putao District, Kachin State, Myanmar].

Syntype NHMUK 1903.7.1.3598 (3 shells; Fig. 10J, K).

The original description included an illustration, one set of measurements, and Godwin-Austen (1915) indicated that he examined three specimens. The NHM type collections contain a lot of three specimens with a label in Godwin-Austen’s handwriting stating “Type”. The specimen closest to the given measurements and illustrations in the original description is figured herein (Fig. 10J).

Cyclotus Swainson, 1840

South Celebes, at 2000 feet [south Sulawesi Province, Indonesia].

Syntype NHMUK 1896.4.30.1 (1 shell; Fig. 11B), NHMUK 1896.5.1.1–2 (2 shells; Fig. 11C).

There are three specimens in the NHM type lot with a label in Smith’s handwriting stating the species name and collection locality. One specimen has a small label “Type” attached under the shell. This specimen matches well to the illustration and shell dimensions given in the original description and is figured herein (Fig. 11B).

Cyclotus Swainson, 1840

Siam [Thailand].

Syntype NHMUK 1856.7.21.1 (5 adults + 3 juveniles; Fig. 11D, E).

Martens (1860) states that this species was described based on material in the British Museum [= NHM] collected by JC Bowring from Siam. The original description did not include an illustration and only one set of shell measurements was given. The NHM collections contain a lot of eight specimens with an original label stating “typical specimens”, and with the collection locality “Siam”. The NHM registration book shows that this specimen lot was purchased from JC Bowring. The specimen that matches most closely with the shell measurements in the original description is figured herein (Fig. 11D).

Rhiostoma Benson, 1860

Camboja [Cambodia].

Syntype NHMUK 20130214 (4 shells; Fig. 11F, G).

This species was described based on specimens collected by H Mouhot from the Cuming collection. The original description included an illustration and one set of shell measurements. There are four specimens in the NHM collections from the Cuming collection with an original label in Pfeiffer’s handwriting stating the taxon name, collector and collection locality. The specimen that closely matches the illustration ans has a small label stating “Type” glued inside the umbilicus is figured herein (Fig. 10F).

Cyclotus Swainson, 1840

probably in Borneo.

Syntype NHMUK 1893.2.4.1547–1549 (3 shells; Fig. 11H, I).

The original description did not include an illustration and only one set of shell measurements was given. There are three specimens in the NHM collections purchased from A Morelet with the original label stating “type of spiniferum on left”, and with the collection locality “Borneo”. The specimen with an attached operculum, that most closely matched with the measurements given in the original description, and is marked with “X” under the shell, is figured herein (Fig. 10H).

Pterocyclos Benson, 1832

Abor Hills [region in Arunachal Pradesh State, India].

Holotype NHMUK 1903.7.1.3082 (Fig. 11J).

The original description clearly stated that this taxon was described based on only one specimen. The NHM collections contain a lot consisting of a single specimen with a label in Godwin-Austen’s handwriting stating “Type”. This specimen matches well with the illustrations and measurements given in the original description, and so we consider this specimen as the holotype fixed by monotypy.

Figure 11. 

A Possible syntype Pterocyclos rupestris puriensis B, C syntype of Cyclotus pyrostoma D, E syntype of Cyclotus siamensis F, G syntype of Rhiostoma simplicilabre H, I syntype of Cyclotus spiniferus J holotype of Pterocyclos spiramentum K, L syntype of Cyclotus suluanus.

Cyclotus Swainson, 1840

Ise of Batchian [Bacan Islands, North Maluku Province, Indonesia].

Syntype NHMUK 20170362 (1 shell; Fig. 12A).

The original description did not include an illustration and only one set of shell measurements was given. Pfeiffer (1861) stated that this taxon was described from a specimen collected by AR Wallace in the Cuming collection. Later Reeve (1863) re-published the description and figured a specimen from the Cuming collection. The NHM collections contain a lot consisting of only one specimen from the Cuming collection with a label in Pfeiffer’s handwriting stating the species name and collection locality, however this has been subsequently overwritten. This shell matches well with the measurements given in the original description and the illustration in Reeve (1863).

Cyclotus Swainson, 1840

Sulu [Sulu Province, Philippines].

Syntype NHMUK 1891.3.17.966–967 (2 shells; Fig. 11K, L).

The species description was clearly based on two specimens collected by R Hungerford and housed in the British Museum [= NHM]. The original description included an illustration and gave one set of shell measurements. The NHM collections contain a lot of two specimens with a label stating “Types”. The specimen that matches well with the illustration and shell dimensions given in the original description is figured herein (Fig. 10K).

The manuscript name “Cyclotus suluanus m.” was first mentioned in Möllendorff (1890: 270) and then cited as “Cyclotus suluanus Möllf., MS.” in Cooke (1892). However, these two treatments do not make this name available since they lacked description or indication as is required by the ICZN (1999: Art. 12). Smith (1894) published a complete description and illustration of this taxon, where the name was made available and therefore Smith is given authorship.

Cyclotus Swainson, 1840

Taiwan, Formosa.

Lectotype (designated by Hwang 2014: 4, fig. 1a) NHMUK 1871.1.20.9/1 from Formosa (Fig. 12B), paralectotypes NHMUK 1871.1.20.9/2–8 from Formosa (7 shells; Fig. 12C), NHMUK 1878.1.28.22 from Taiwan, Formosa (3 shells).

Rhiostoma Benson, 1860

Khao Sabap, Siam [Plieu National Park, Khlung District, Chanthaburi Province, Thailand].

Holotype NMW 1955.158.24924, paratypes NHMUK 1949.6.7.1 (2 shells; Fig. 12D), NHMUK 20170372 JE Cooper coll. Acc. no. 2150 (1 juvenile).

The original description included an illustration, one set of shell measurements, and was clearly based on more than one specimen. The author indicated that the ‘Type’ was kept in the JR le B Tomlin collection and ‘Paratypes’ were housed in the NHM collections. The holotype was clearly designated and is housed in the JR le B Tomlin collection (later transferred to the NMW in Cardiff). The NHM collections contain two lots, consisting of three shells in total, both containing an original label stating “Paratype”. The collection locality matches with the original description. Therefore, we consider these specimens as paratypes.

Cyclotus Swainson, 1840

Russel-Canda, Madras [in the area of Chennai District, Tamil Nadu State, India].

Syntype NHMUK 20030588 (3 shells; Fig. 12E, F).

The original description by Pfeiffer includes the illustration of a shell and gives one set of shell measurements. The type lot in the NHM collections was collected by “Dr. Trail” and is from the Cuming collection as stated in the original description. It has an original label in Pfeiffer’s handwriting giving the species name and collection locality. The largest specimen, marked with an “x” which most closely matches the measurements and the illustration shown in the original description is figured herein (Fig. 12E).

In montibus Travancoricis haud procul a Tinnevelly [Hills between Kerala State and Tinnevelly District, Tamil Nadu State, India].

Holotype NHMUK 1912.04.16.646/1 (Fig. 12G) fixed by monotypy.

Cyclotus Swainson, 1840

Trusan Island [Terusan Island, Sabah, Malaysia].

Syntype NHMUK 1889.12.7.22 (1 shell; Fig. 12H).

The species description was clearly based on more than one specimen. The original description included an illustration of a single specimen and gave two sets of shell measurements. The NHM collections contain a lot consisting of a single shell with an original label stating “type”. This shell matches with the illustration and the shell sizes correspond well with the measurements of the specimen cited as “Size of shell drawn”, in the original description.

Cyclotus Swainson, 1840

unknown.

Syntype NHMUK 20170370 (3 shells; Fig. 12I, J).

The original description did not include an illustration or collection locality. Pfeiffer stated that this species was described based on material from the Cuming collection, and only one set of shell dimensions was given. Later, Reeve (1863) re-published the description and figured a specimen from the Cuming collection. A specimen lot containg three shells from the Cuming collection with an original label in Pfeiffer’s handwriting giving the species name is housed in the NHM collections. The specimen that most closely matches the measurements given in the original description and the illustration in Reeve (1863) is figured herein (Fig. 12I).

Scabrina Blanford, 1863

Vanbu, Tonkin [Van Ban District, Lao Cai Province, Vietnam].

Lectotype (design. n.) NHMUK 1896.1.25.7 (Fig. 12K), paralectotype NHMUK 1896.1.25.8 (1 shell; Fig. 12L).

The original description included only one set of shell measurements; however, the species description was not explicitly based on one specimen. There are two shells in the NHM type lot with an original label stating “Types”, subsequently changed to read “holotype red spot”. The shell that matches the measurements given in the original description is here designated as the lectotype to stabilise the name.

Figure 12. 

A Syntype of Cyclotus subflammulatus B, C Cyclotus taivanus B lectotype and C paralectotype D paratype of Rhiostoma tomlini E, F syntype of Cyclotus trailli G holotype of Pearsonia travancornica H syntype of Cyclotus trusanensis I, J syntype of Cyclotus tubuliferus K, L Scabrina vanbuensis K lectotype and L paralectotype.

Cyclotus Swainson, 1840

Jampea Island [Pulau Jampea, Selayar Islands Regency, south Sulawesi Province, Indonesia].

Syntype NHMUK 1896.5.16.46–51 (5 adults + 1 juvenile; Fig. 13A, B).

Smith stated in the introduction to his paper that he had received specimens from A Everett. There are six specimens in the NHM type lot with original labels in Smith’s handwriting. The original description gives one set of measurements and an illustration of one specimen. The specimen that corresponds to the figure and measurements given in the original description, and with a red spot on the shell is figured herein (Fig. 13A).

Cyclotus Swainson, 1840

Unknown.

Possible syntype NHMUK 20160354 (3 shells; Fig. 13C, D).

The original description of this species included an illustration. Later, Pfeiffer (1853b) and Reeve (1863) re-published the description and figured this species based on material in the Cuming collection. The NHM collections contain a lot of three shells from the Cuming collection with original labels giving the taxon name and citing the illustration “f. 312, 313”. The specimen in the Cuming collection matches well with the illustration in the original description, Pfeiffer (1853b) and Reeve (1863). However, Sowerby I did not clearly state that the species description was based on specimens from the Cuming collection. Therefore, we consider this lot to be possible syntypes.