Research Article |
Corresponding author: Chi-Feng Lee ( chifeng@tari.gov.tw ) Academic editor: Astrid Eben
© 2018 Chi-Feng Lee.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Lee C-F (2018) The genus Paleosepharia Laboissière, 1936 in Taiwan: review and nomenclatural changes (Coleoptera, Chrysomelidae, Galerucinae). ZooKeys 744: 19-41. https://doi.org/10.3897/zookeys.744.22970
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Taxonomic study of species of the genus Monolepta Chevrolat, 1836 with subscutellar incised ridges in males and occurring in Taiwan resulted in the transfer of all species to Paleosepharia Laboissière, 1936: P. amiana (Chûjô, 1962), comb. n., P. formosana (Chûjô, 1935), comb. n., P. nantouensis (Kimoto, 1996) comb. n., and P. yasumatsui (Kimoto, 1969), comb. n. The position of M. excavata Chûjô, 1938 in Paleosepharia is confirmed. Lectotypes are designated for M. excavata Chûjô, 1938 and M. formosana Chûjô, 1935. Generic characters of Paleosepharia are re-evaluated in the context of these nomenclatural changes.
Food plants, leaf beetles, new combination, taxonomic revision
Members of the genus Paleosepharia Laboissière resemble those of Monolepta Chevrolat, but both genera can be separated externally by specific structures of the elytral epipleuron and the sexually dimorphic elytra. The epipleuron is abbreviated or suddenly narrowed before the middle, and subscutellar bulges or incised ridges are absent from the elytra in both sexes of Monolepta. In contrast the epipleuron continues to the apex, and subscutellar bulges or incised ridges are present on the elytra in males of Paleosepharia (
Among the 30 species of Monolepta described from Taiwan so far (
The abdomens of adults were separated from the forebody and boiled in 10 % KOH solution, followed by washing in distilled water to prepare genitalia for illustrations. The genitalia were then dissected from the abdomen, mounted on slides in glycerin, and studied and drawn using a Leica M165 stereomicroscope. For detailed examinations a Nikon ECLIPSE 50i microscope was used.
At least three pairs from each species were examined to delimit variability of diagnostic characters. For species collected from more than one locality, at least one pair from each locality was examined. Length was measured from the anterior margin of the eye to the elytral apex, and width at the greatest width of the elytra.
Specimens studied herein are deposited at the following institutes and collections:
Exact label data are cited for all type specimens of described species; a double slash (//) divides the data on different labels and a single slash (/) divides the data in different rows. Other comments and remarks are in square brackets: [p] – preceding data are printed, [h] – preceding data are handwritten, [w] – white label, [y] – yellow label, [b] – blue label, and [r] – red label.
Monolepta
amiana
Chûjô, 1962: 136 (Taitung);
Depository of the single female holotype is unknown.
Other material examined (n = 82). Pingtung: 1♀ (
Members of Paleosepharia amiana are similar to those of P. excavata, P. formosana, and P. yasumatsui with black stripes along the outer margins of yellow elytra. However, this species is easily recognized by the presence of only one transverse black band on the elytra (two transverse bands in others). The aedeagus of male P. amiana is similar to that of P. nantouensis in possessing a relatively narrow penis (more than 6.5 times longer than wide; less than 6.0 times in other species), acute apex of tectum (bifurcate apex in other species), and one pair of elongate and apically curved spiculae (lacking such spiculae in other species). It differs by the broader tectum (broader than penis; narrower than penis in P. nantouensis) and different sizes of the two pairs of hooked spiculae (same sizes in P. nantouensis).
Males. Length 6.0–6.5 mm, width 3.3–3.4 mm. General color reddish brown (Fig.
Diagnostic characters of Paleosepharia amiana (Chûjô). A Antenna, male B Antenna, female C Penis, dorsal view D Penis, lateral view E Penis, ventral view F Endophallic spiculae G Abdominal ventrite VIII H Bursa sclerites, left sclerite in lateral view, right sclerite in dorsal view I Spermatheca J Gonocoxae.
Females. Length 5.6–6.5 mm, width 3.3–3.5 mm. Similar to male (Fig.
Melastomataceae: Blastus cochinchinensis Lour.; Sapindaceae: Koelreuteria henryi Dummer; Fagaceae: Castanopsis formosana (Skan) Hayata (
Endemic to Taiwan.
Monolepta
excavata
Chûjô, 1938 (Taiwan: Ilan, Nantou, Hualien): 144;
Paleosepharia
excavata
:
Paleosepharia
polychroma
Laboissière, 1938: 8 (China: Jiangsu, Jiangxi);
Monolepta excavata. Lecotype ♂ (
Paleosepharia polychroma. The syntypes at the Institute Royal des Sciences Naturelles de Belgique, Bruxelles, and the Naturhistoriska Riksmuseet, Stockholm were not studied. Paleosephariapolychroma could be a distinct species because of slight difference of color patterns on the elytra between both species. Correctly assessing the status of this species requires further study.
(n = 72). Chiayi: 1♂ (
Adults of Paleosepharia excavata are similar to those of P. formosana and P. yasumatsui in possessing two transverse black bands on yellow elytra, but this species is easily recognized by its slender, indistinctly margined transverse black bands (broad and distinctly margined bands in others). Males of these species are also similar in possessing a broader penis (less than 6.0 times longer than wide; more than 6.5 times in other species), bifurcate apex of tectum (acute apex in other species), and lacking a pair of elongate and apically curved spiculae (such spiculae present in other species). Males of P. excavata differ in possessing a shallow notch in the apex of the tectum (deep notch in apex of tectum in P. yasumatsui), recurved apex of penis (not recurved in P. yasumatsui), short hooked spiculae 1/2 lengths of longer spiculae (1/6 lengths of longer spiculae in P. formosana, 4/5 lengths of longer spiculae in P. yasumatsui).
Males. Length 4.8–6.1 mm, width 2.5–3.0 mm. General color reddish brown (Fig.
Diagnostic characters of Paleosepharia excavata (Chûjô). A Antenna, male B Antenna, female C Penis, dorsal view D Penis, lateral view E Penis, ventral view F Endophallic spiculae, hooked spiculae removed at right side G Abdominal ventrite VIII H Bursa sclerites, left sclerite in lateral view, right sclerite in dorsal view I Spermatheca J Gonocoxae.
Females. Length 5.4–6.3 mm, width 2.8–3.3 mm. Similar to male (Fig.
Betulaceae: Alnus formosana (Burkill ex Forbes & Hemsl.) Makino (
Taiwan, China.
Monolepta
formosana
Chûjô, 1935: 172 (Taipei, Nantou);
Lectotype ♂ (
(n = 90). Hsinchu: 1♀ (
Adults of Paleosephariaformosana are similar to those of P. yasumatsui in possessing two broad, well-defined transverse black bands on the elytra. However, males of P. yasumatsui are easily separated from those of P. formosana by the absence of anterior transverse black bands near the suture (present in P. formosana), and presence of clusters of stout setae behind the scutellum (lacking stout setae in P. formosana). Females of P. yasumatsui are similar to those of P. formosana but differ by their straight lateral margins of the elytra and continuously arcuate posterior black stripes (rounded elytra and independently arcuate black stripes in P. formosana). Males of P. formosana, P. excavata, and P. yasumatsui are similar in possessing a broad penis (less than 6.0 times longer than wide; more than 6.5 times in other species), bifurcate apex of tectum (acute apex in other species), lacking a pair of elongate, apically curved spiculae (such spiculae present in other species). They differ in possessing a shallow notch of the apex of the tectum (deep notch in P. yasumatsui), recurved apex of the penis (not recurved in P. yasumatsui), short hooked spiculae 1/6 the lengths of longer spiculae (1/2 length of longer spiculae in P. excavata, 4/5 length of longer spiculae in P. yasumatsui).
Males. Length 5.6–6.3 mm, width 3.2–3.5 mm. General color reddish brown (Fig.
Diagnostic characters of Paleosepharia formosana (Chûjô). A Antenna, male B Antenna, female C Penis, dorsal view D Penis, lateral view E Penis, ventral view F Endophallic spiculae G Abdominal ventrite VIII H Bursa sclerites, left sclerite in lateral view, right sclerite in dorsal view I Spermatheca J Gonocoxae.
Females. Length 5.7–6.7 mm, width 3.4–3.6 mm. Similar to male (Fig.
Saxifragaceae: Itea parviflora Hemsl.; Hamamelidaceae: Liquidambar formosana Hance; Myrsinaceae: Ardisia sieboldii Miq (
Endemic to Taiwan.
Monolepta
nantouensis
Kimoto, 1996: 38;
Paratype 1♀ (
(n = 22). Hsinchu: 2♀♀ (
Males. Length 4.7–5.2 mm, width 2.4–2.6 mm. General color yellowish brown (Fig.
Diagnostic characters of Paleosepharia nantouensis (Kimoto). A Antenna, male B Antenna, female C Penis, dorsal view D Penis, lateral view E Penis, ventral view F Endophallic spiculae G Abdominal ventrite VIII H Bursa sclerites, left sclerite in lateral view, right sclerite in dorsal view I Spermatheca J Gonocoxae.
Females. Length 5.3–6.3 mm, width 2.6–3.3 mm. Similar to males (Fig.
Fagaceae: Castanopsis carlesii (Hemsl.) Hayata (
Endemic to Taiwan.
Monolepta
yasumatsui
Kimoto, 1969: 51 (Nantou, Ilan);
Holotype ♂ (
(n = 68). Hsinchu: 1♂, 1♀ (
Adults of P. yasumatsui are similar to those of P. formosana in possessing two broad, distinctly margined transverse black bands on the elytra. However, males of P. yasumatsui are easily separated from those of P. formosana by the absence of an anterior, transverse black band near the suture (present in P. formosana), and presence of clusters of stout setae behind the scutellum (lacking stout setae in P. formosana). Females of P. yasumatsui are similar to those of P. formosana but differ in the straight lateral margin of the elytra and continuously arcuate, posterior black stripes (rounded elytra and separated arcuate black stripes in P. formosana). Males of P. formosana, P. excavata, and P. yasumatsui are similar in possessing a broader penis (less than 6.0 times longer than wide; more than 6.5 times in other species), bifurcate apex of tectum (acute apex in other species), and lacking a pair of elongate, apically curved spiculae (such spiculae present in other species). Males of P. yasumatsui differ in having a deep notch at the apex of the tectum (shallow notch at apex of tectum in other species), curved apex of penis (recurved in other species), short, hooked spiculae 4/5 sizes of long spiculae (1/2 sizes of long spiculae in P. excavata, 1/6 sizes of long spiculae in P. formosana).
Males. Length 5.2–6.0 mm, width 2.7–3.3 mm. General color reddish brown (Fig.
Diagnostic characters of Paleosepharia yasumatsui (Kimoto). A Antenna, male B Antenna, female C Penis, dorsal view D Penis, lateral view E Penis, ventral view F Endophallic spiculae, hooked spiculae removed at right side G Abdominal ventrite VIII H Bursa sclerites, left sclerite in lateral view, right sclerite in dorsal view I Spermatheca J Gonocoxae.
Females. Length 4.6–5.7 mm, width 2.6–3.1 mm. Similar to male (Fig.
Saxifragaceae: Itea parviflora Hemsl.; Betulaceae: Alnus formosana (Burkill ex Forbes & Hemsl.) Makino; Symplocaceae: Symplocos wikstroemiifolia Hayata (
Endemic to Taiwan.
1 | Elytra black, with one pair of inwardly curved white stripes (Fig. |
P. nantouensis |
– | Elytra yellow, with black stripes along outer margins and transverse black bands | 2 |
2 | Only one transverse black band on elytra (Fig. |
P. amiana |
– | Two transverse black bands on elytra | 3 |
3 | Transverse black bands on elytra slender and weakly margined; tibiae reddish brown (Fig. |
P. excavata |
– | Transverse black bands on elytra broad and distinctly margined; tibiae black | 4 |
4 | Anterior transverse black bands reduced near suture, cluster of stout setae behind scutellum present in males (Fig. |
P. yasumatsui |
– | Anterior transverse black bands connected and lacking cluster of stout setae behind scutellum in males (Fig. |
P. formosana |
All species considered in this study definitely belong within Paleosepharia. This conclusion is based on the presence of subscutellar incised ridges on the elytra in males and the continuous elytral epipleurae and truncate apices. In males, the aedeagi of all species possess one paired cluster of short, basally hooked setae and one pair of elongate rows of slender and apically tapering lateral setae. Additionally, they possess two pairs of strongly sclerotized spiculae as
I am grateful to the Taiwan Chrysomelid Research Team (TCRT) for assistance in collecting material, including Hou-Jay Chen, Jung-Chang Chen, Yi-Ting Chung, Bo-Xin Guo, Hsueh Lee, Wen-Chuan Liao, Mei-Hua Tsou, and Su-Fang Yu. I especially thank Chi-Lung Lee, and Hsing-Tzung Cheng for photos of specimens, and Chih-Kai Yang for identification of host plants. This study was supported by the Ministry of Science and Technology MOST 105-2313-B-055-001-MY2. I am grateful to Prof. Christopher Carlton (Louisiana State Arthropod Museum, USA) for reviewing the manuscript.