Research Article |
Corresponding author: Chao Zhang ( opiliones@163.com ) Academic editor: Gonzalo Giribet
© 2018 Chao Zhang, Jochen Martens.
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:
Zhang C, Martens J (2018) Rediscovery of Lobonychium palpiplus Roewer, 1938 (Opiliones, Laniatores, Epedanidae) in Sabah, Malaysia. ZooKeys 785: 29-40. https://doi.org/10.3897/zookeys.785.26389
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Lobonychium palpiplus Roewer, 1938, originally reported from Indonesian Borneo, is redescribed based on the specimens from Malaysia. The genitalia of this species are described for the first time and a new genital terminology is proposed. The rediscovery expands the known distribution of the species to Malaysian Borneo.
Arachnida , harvestmen, genitalia, functional morphology, taxonomy, Indonesia
The monotypic epedanid genus Lobonychium Roewer, 1938 was previously known from three specimens of the nominate species L. palpiplus Roewer, 1938, collected in the area of Pontianak (Kalimantan Barat, Indonesia, island of Borneo). The species is peculiar in having seven ventral and medial setiferous tubercles on the femur of the pedipalp and basal lobes on the claw of tarsi III and IV. The types are deposited in the Naturmuseum Senckenberg, Sektion Arachnologie, Frankfurt am Main, Germany. Except for the original description, the genus and species have not been mentioned in the literature during the past eighty years.
In February 2017, the senior author was able to re-examine the type specimens. Moreover, Malaysian Borneo, to the north of the type locality, was visited in October 2015 and May 2017 and several specimens (male and female) of L. palpiplus were collected. The newly discovered Lobonychium specimens are redescribed and illustrated.
The functional morphology of the male genitalia has been elaborated in some Laniatores families, e.g., Assamiidae Sørensen, 1884; Biantidae Thorell, 1889; Fissiphalliidae Martens, 1988; Phalangodidae Simon, 1879; Podoctidae Roewer, 1912; Stygnommatidae Roewer, 1923; Zalmoxidae Sørensen, 1886, etc. (
Taxonomic methods follow the outline proposed by
Lobonychium Roewer, 1938: 125.
Lobonychium palpiplus Roewer, 1938, by monotypy.
The name Lobonychium is derived from the Greek λοβός, meaning lobe of the ear, and the Latinized Greek onyx (genitive onychos), meaning claw.
Body, including ocularium, unarmed. Basichelicerite and tibia II elongate. Basichelicerite dorsally with conspicuous granules. Femur of pedipalp ventrally with a row of seven setiferous tubercles. Distitarsus I with two tarsomeres, distitarsus II with three. Double claws of tarsi III–IV with basal lobes, untoothed; no scopula. Ventral plate of penis forming a heart-shaped stereoscopic structure (ventral view, Fig.
Tibia II in male distended at distal portion, but normal in female.
Within the subfamily Epedaninae, Lobonychium is morphologically similar to Epedanidus Roewer, 1943, Metepedanulus Roewer, 1913, and Zepedanulus Roewer, 1927 in having an unarmed body. Besides, Lobonychium and Caletorellus Roewer, 1938 have characteristic basal lobes or medial branches on double claws of tarsi III–IV (
The type locality is at or near the city of Pontianak (Fig.
Lobonychium palpiplus Roewer, 1938: 125, fig. 44.
Male lectotype (SMF-5376-1201), here designated, labeled: “Lobonychium palpiplus, male lectotype (SMF-5376-1201), designated by Chao Zhang [handwritten]”.
All types (lectotype and two paralectotypes) from Pontianak [00°01'S, 109°20'E], Borneo (West Kalimantan, Indonesia), deposited in the Senckenberg Museum Frankfurt, Germany, labeled: “Arachn. Coll. Roewer – Lfd. No. 5376, Opil: Epedaninae No. 16, Lobonychium palpiplus Rwr [abbreviation for Roewer], 2♂1♀, Borneo: Pontianak, Typus, Roewer det. 1935” (Fig.
Additional material examined. 1♂ (MHBU-Opi-20151208m) and 2♀, (MHBU-Opi-20151208f, MHBU-Opi-2015120801f), Malaysia: Sabah, Trus Madi Mountain, about 1103 m alt. 05°25.637'N, 116°25.984'E, October 9, 2015, Z. Z. Gao leg.; 1♀, Malaysia: Sabah, Trus Madi Mountain, about 1081 m alt. 05°26.111'N, 116°27.237'E, October 10, 2015, Z. Z. Gao leg.; 1♀, Malaysia: Sabah, Trus Madi Mountain, about 760 m alt. 05°27.598'N, 116°26.936'E, October 12, 2015, Z. Z. Gao leg.; 1♀, Malaysia: Sabah, Kalabakan, about 330 m alt. 04°32.522'N, 117°10.020'E, October 18, 2015, Z. Z. Gao leg.; 2♀, Malaysia: Sabah, Trus Madi Mountain, about 1121 m alt. 05°26.529'N, 116°27.309'E, May 1, 2017, C. Jin leg.; 1♂1♀, Malaysia: Sabah, Trus Madi Mountain, about 1081 m alt. 05°26.111'N, 116°27.237'E, May 3, 2017, C. Jin leg.
Male (MHBU-Opi-20151208m) habitus as in Figs
Lobonychium palpiplus Roewer, 1938, male (MHBU-Opi-20151208m) (1–6), female (MHBU-Opi-20151208f) (7) 1 Body, lateral view 2 Left chelicera, medial view 3 Same, ectal view 4 Cheliceral fingers, frontal view 5 Basal segment of left chelicera, dorsal view 6 Left pedipalp, medial view 7 Right pedipalp, medial view. Scale bars: 1mm (1, 6–7); 0.5 mm (2–3, 5); 0.25 mm (4).
Dorsum (Figs
Lobonychium palpiplus Roewer, 1938, male (MHBU-Opi-20151208m) (8–16), female (MHBU-Opi-20151208f) (17–22) 8 Body, dorsal view 9 Same, ventral view 10 Right tarsus I, retrolateral view 11 Distal segment of right tarsus III, retrolateral view 12–15 Patellae and tibiae of left legs, prolateral view 12 Leg I 13 Leg II 14 Leg III 15 Leg IV 16 Basal segment of right chelicera, dorsal view 17 Body, dorsal view 18 Right chelicera, ectal view 19 Cheliceral fingers, frontal view 20 Basal segment of left chelicera, ectal view 21 Patella and tibia of left leg II, prolateral view 22 Ovipositor, ventral view. Scale bars: 1 mm (8–9, 12–15, 17, 21); 0.5 mm (10, 16, 18, 20); 0.25 mm (11, 19, 22).
Venter (Fig.
Chelicerae (Figs
Pedipalpi (Fig.
Legs (Figs
Penis (Figs
Lobonychium palpiplus Roewer, 1938 (MHBU-Opi-20151208m) 23 Penis, ventral view 24 Same, dorsal view 25 Same, lateral view 26 Distal part of penis, lateral view 27 cross-section through glans and truncus at the marked point 28 Distal part of penis (expanded), ventral view 29 Same, dorsal view 30 Same, lateral view. Abbreviations: CE capsula externa (follis) CI capsula interna G glans S stylus VF ventral frame. Scale bars: 0.25 mm.
Female (MHBU-Opi-20151208f) (Figs
Lobonychium palpiplus Roewer, 1938 Photographs of male (MHBU-Opi-20151208m) and female (MHBU-Opi-20151208f) 31 Male body and parts of appendages, dorsal view 32 Female body and parts of appendages, dorsal view 33 Same, lateral view 34 Same, ventral view. Scale bars: 1 mm (Fig.
Ovipositor (Fig.
Male (female): body 1.89 (2.74) long, 1.36 (1.64) wide at widest portion, scutum 1.69 (1.76) long. Ocularium 0.19 (0.20) long, 0.37 (0.35) wide. Proximal article of chelicera 0.69 (0.62) long, 0.24 (0.23) wide; second 0.89 (0.98) long, 0.26 (0.26) wide; distal 0.40 (0.44) long, 0.09 (0.08) wide. Pedipalp claw 0.64 (0.63) long. Penis 0.88 long. Measurements of pedipalp and legs as in Tables
Pedipalp and leg measurements (mm) of Lobonychium palpiplus Roewer, 1938, male, length/width.
Trochanter | Femur | Patella | Tibia | Metatarsus | Tarsus | Total | |
---|---|---|---|---|---|---|---|
Pedipalp | 0.32/0.28 | 1.47/0.20 | 0.97/0.19 | 0.77/0.18 | 0.71/0.14 | 4.24 | |
Leg I | 0.35/0.18 | 1.72/0.14 | 0.46/0.18 | 1.38/0.11 | 2.21/0.05 | 1.33/0.03 | 7.45 |
Leg II | 0.36/0.18 | 3.34/0.10 | 0.66/0.18 | 2.99/0.17 | 3.75/0.05 | 2.80/0.04 | 13.90 |
Leg III | 0.37/0.24 | 2.20/0.15 | 0.64/0.25 | 1.23/0.17 | 2.63/0.10 | 1.24/0.07 | 8.31 |
Leg IV | 0.37/0.24 | 2.90/0.15 | 0.61/0.25 | 1.52/0.17 | 3.56/0.10 | 1.44/0.07 | 10.40 |
Pedipalp and leg measurements (mm) of Lobonychium palpiplus Roewer, 1938, female, length/width.
Trochanter | Femur | Patella | Tibia | Metatarsus | Tarsus | Total | |
---|---|---|---|---|---|---|---|
Pedipalp | 0.45/0.31 | 1.49/0.18 | 1.10/0.22 | 0.91/0.19 | 0.89/0.12 | 4.84 | |
Leg I | 0.37/0.19 | 1.62/0.10 | 0.48/0.18 | 1.36/0.10 | 2.20/0.06 | 1.34/0.04 | 7.37 |
Leg II | 0.39/0.20 | 3.18/0.10 | 0.62/0.18 | 3.01/0.10 | 3.72/0.06 | 2.73/0.04 | 13.65 |
Leg III | 0.42/0.26 | 2.13/0.12 | 0.54/0.26 | 1.28/0.16 | 2.54/0.09 | 1.10/0.06 | 8.01 |
Leg IV | 0.42/0.26 | 2.88/0.12 | 0.54/0.26 | 1.61/0.16 | 3.41/0.09 | 1.43/0.06 | 10.29 |
The specimens were collected by leaf litter sieving in dark moist places under dense forest canopy.
The collection examined contains ten specimens, two males and eight females. The male (MHBU-Opi-20151208m) and the female (MHBU-Opi-20151208f) described here are asymmetrical in the position of granules on the left (Figs
Numbers of tarsomeres of on legs of Lobonychium palpiplus Roewer, 1938. L left, R right tarsus. Only one number is given when the specimen is symmetrical.
Specimen number (n=10) | Sex | Leg I | Leg II | Leg III | Leg IV |
---|---|---|---|---|---|
1 | male | 7 | L19, R 21 | 7 | 7 |
2 | female | 7 | L19, R 20 | 7 | 7 |
3, 4 | male and female | 7 | 19 | 7 | 7 |
5, 6 | females | 7 | 22 | 7 | 7 |
7, 8 | females | 7 | 18 | 7 | 7 |
9 | female | 7 | L18, R 21 | 6 | 7 |
10 | female | 7 | 21 | 7 | 7 |
Indonesia (Pontianak), Malaysia (Trus Madi Mountain, Kalabakan).
The three type specimens have not been dissected and are in good condition, with all appendages attached. The original description of the types by
Additionally, the localities of the new records from Malaysia are at most about 120 km apart. The distance between the recorded type locality (Indonesian part of Borneo) and the new localities (Malaysian part) is nearly 1000 km (Fig.
According to the drawings presented by
We thank Peter Jäger, Julia Altmann, Lukas Keine, and Lea Wolter for their very kind attention during one of the author’s (CZ) visit to the SMF. Many thanks are due to Zhizhong Gao and Chi Jin for collecting the specimens. This work was supported by the National Natural Science Foundation of China (No. 31471956), and the researcher alumni network Senckenberg, Frankfurt am Main, Germany (FANS). Adriano B. Kury and Gonzalo Giribet provided insightful criticism to the draft. Chris Glasby kindly checked the English style and wording. We heartily thank them for their valuable help.