Trilacuna jinyun Tong, Zhang & Li, 2021

Huang, Ying, Bian, Dong-Ju, Tong, Yan-Feng, Zhang, Zhi-Sheng & Li, Shu-Qiang, 2021, Two new species of the genus Trilacuna (Araneae: Oonopidae) from Jinyun Mountain of Chongqing, China, European Journal of Taxonomy 748, pp. 1-14 : 3-8

Trilacuna jinyun Tong, Zhang & Li sp. nov.

urn:lsid:zoobank.org:act:7B177C33-6884-40B3-BB08-A61DFACE5190

Figs 1–3 , 4A–B, E–F , 8

Differential diagnosis

This new species is similar to Trilacuna simianshan Tong & Li, 2018 , but males can be distinguished by the large flag like protrusion and the broad dorsal branch of embolus system ( Fig. 2E, F, H ), and females by the rectangular shaped structure of endogyne ( Fig. 4F ). Males of T. simianshan have a rectangular projection and narrow dorsal branch of embolus system, and females have a cone-shaped structure of endogyne ( Tong et al. 2018: figs 3a–f, 5i).

Etymology

The specific name is a noun in apposition and refers to the type locality.

Material examined

Holotype CHINA • ♂; Chongqing Municipality, Beibei District, Jinyun Mountain , Caijiagou ; 12 Oct. 2008; Zhisheng Zhang et al. leg.; SYNU-291 .

Paratypes CHINA • 4 ♀♀; same collection data as for holotype; SYNU-292 to 295 • 1 ♂; Jinyun Mountain , Canal Protection Station; 4 Dec. 2010; Zhong Li and Zongxu Li leg.; SWUC-T-OO-01-1 • 3 ♀♀; Jinyun Mountain ; 12 Apr. 2010; Luyu Wang leg.; SWUC-T-OO-01-2 to 4 .

Description

Male (holotype)

BODY. Yellow; habitus as in Fig. 1A–C ; body length 2.39. Carapace ( Fig. 1D, F–G ): 1.23 long, 0.97 wide; sides granulate; lateral margin rebordered.

EYES ( Fig. 1A, G ). Well developed, arranged in a compact group; ALE, PME and PLE subequal; ALE– PLE separated by less than ALE radius, PME touching each other; posterior row recurved from above, procurved from front.

CLYPEUS ( Fig. 1G ). Sinuous in frontal view, ALE separated from edge of carapace by about 1.8 times their diameter.

MOUTHPARTS ( Fig. 1E, G ). Chelicerae straight; labium rectangular, anterior margin deeply incised; endites slender, distally strongly curved branched.

STERNUM ( Fig. 1E ). With radial furrows between coxae I–II, II–III, III–IV; surface medially strongly rugose.

ABDOMEN ( Fig. 1A–C ). Abdomen 1.30 long, 0.92 wide; booklung covers ovoid, surface smooth; dorsal scutum not fused to epigastric scutum; apodemes present, posterior spiracles connected by a shallow groove; sperm pore oval, situated between anterior spiracles.

LEG SPINATION (all spines longer than segment width). Legs I–II: tibia: v2-2-2-2-0, metatarsus: v2-2-0.

PALP ( Figs 2 , 4A–B ). Orange; 0.67 long (0.21, 0.12, 0.17, 0.17); femur greatly swollen (width/length = 0.67); bulb oval, tapering apically; embolus system ( Fig. 2C–H ) with a broad dorsal branch (db), a very

narrow thread-like ventral branch (vb), and a broad anterior branch (ab) in prolateral view, a flag like protrusion (flp) in dorsal view, and a circular projection (cp) in retrolateral view.

Female (SYNU-292)

Same as male except as noted; slightly larger than male. Body: length 2.44; habitus as in Fig. 3A– C . Carapace: 1.02 long, 0.89 wide. Endites: unmodified. Abdomen: 1.53 long, 0.98 wide. Epigaster ( Figs 3B , 4E ): middle part of posterior margin of epigastric scutum (pe) much extended posteriorly, with sclerotized recurved arches (sar) between posterior spiracles (psp). Endogyne ( Fig. 4F ): with a rectangular shaped structure (rss), at the posterior end of the rectangular shaped structure is a slender line-like structure (sls) extending anteriorly; with two lateral apodemes (ap).

Distribution

China (Chongqing) ( Fig. 8 ).

Figures

Fig. 1. Trilacuna jinyun Tong, Zhang & Li sp. nov., holotype, ♂ (SYNU-291). A–C. Habitus in dorsal, ventral, and lateral views. D–G. Prosoma in dorsal, ventral, lateral, and anterior views. Abbreviations: ehb = elevated hair base; ldi = labium deep incision; sdb = strongly curved distal branch. Scale bars: 0.4 mm.

Fig. 2. Trilacuna jinyun Tong, Zhang & Li sp. nov., left male palp, SEM, holotype, ♂ (SYNU-291). A–B, G. Prolateral, retrolateral, and dorsal views. C–D. Palpal bulb in prolateral and retrolateral views. E–F, H. Distal part of palpal bulb in prolateral, retrolateral, and dorsal views. Abbreviations: ab = anterior branch; cp = circular projection; db = dorsal branch; flp = flag like protrusion; vb = ventral branch.

Fig. 3. Trilacuna jinyun Tong, Zhang & Li sp. nov., paratype, ♀ (SYNU-292). A–C. Habitus in dorsal, ventral, and lateral views. D–G. Prosoma in dorsal, ventral, lateral, and anterior views. Abbreviations: ehb = elevated hair base; ldi = labium deep incision. Scale bars: 0.4 mm.

Fig. 4. A–B. Trilacuna jinyun Tong, Zhang & Li sp. nov., holotype, ♂ (SYNU-291). C–D. T. jiuchi Tong, Zhang & Li, sp. nov., holotype, ♂ (SYNU-300). E–F. T. jinyun sp. nov., paratype, ♀ (SYNU- 292). G–H. T. jiuchi sp. nov., paratype, ♀ (SYNU-303). A, C. Left palp, prolateral view. B, D. Left palp, retrolateral view. E, G. Epigaster, ventral view. F, H. Endogyne, dorsal view. Abbreviations: ap = apodeme; as = anterior sclerite; pe = posterior extension; psp = posterior spiracle; rss = rectangular shaped structure; sar = sclerotized, recurved arches; sls = slender line-like structure; tba = transverse bars; tsc = transverse sclerite; wss = worm-shaped structure. Scale bars: 0.2 mm.

Fig. 8. The type locality of the two new species, Jinyun Mountain, Chongqing.