Trilacuna jinyun Tong, Zhang & Li 2021, sp. nov.

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).