Trilacuna difeng Wang, Tong, Bian, and Li 2021
- Dataset
- Two new species of the genus Trilacuna from Chongqing Municipality, China (Araneae, Oonopidae)
- Rank
- SPECIES
- Published in
- Wang, Ying, Tong, Yanfeng, Bian, Dongju, Li, Shuqiang (2021): Two new species of the genus Trilacuna from Chongqing Municipality, China (Araneae, Oonopidae). Zootaxa 4927 (3): 431-443, DOI: 10.11646/zootaxa.4927.3.6
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Arachnida
- order
- Araneae
- family
- Oonopidae
- genus
- Trilacuna
- species
- Trilacuna difeng
description
Description. Male (holotype, SYNU- 264). Body yellow, chelicerae and sternum lighter. Habitus as in Fig. 1 A, C, E. Body length 1.97; carapace 0.93 long, 0.76 wide; abdomen 1.03 long, 0.68 wide. Carapace sides granulate; lateral margin rebordered. Six eyes, 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 (Fig. 1 B, I). Clypeus sinuous in frontal view, anterior lateral eyes separated from edge of carapace by about 1.4 times their diameter. Mouthparts: chelicerae straight, proximal region with one hair with elevated hair base; labium rectangular, anterior margin deeply incised (Fig. 1 D); endites slender, distally strongly branched (Fig. 1 D). Sternum with radial furrows between coxae I-II, II-III, III-IV; surface medially strongly reticulated (Fig. 1 D). Abdomen (Fig. 1 G, H): booklung covers ovoid, surface smooth; dorsal scutum not fused to epigastric scutum; apodemes present, posterior spiracles not connected; sperm pore oval, situated between anterior and posterior spiracles. Leg spination (all spines longer than segment width): legs I-II: tibia: v 2 - 2 - 2 - 2 - 0, metatarsus: v 2 - 2 - 0. Palp (Figs 2 A – D, 3): orange; 0.62 long (0.19, 0.14, 0.14, 0.15); femur greatly swollen (width / length = 0.68); bulb oval, tapering apically; embolus system (Fig. 3 E, F, H) with a broad sickle-shaped branch (ssb) in prolateral view, a median branch (mb) in dorsal view, and a lateral curved branch (lb) in retrolateral view. Female (SYNU- 267): Same as male except as noted. Habitus as in Fig. 4 A, C, E; slightly larger than male. Body length 2.02, carapace 0.91 long, 0.76 wide, abdomen 1.15 long, 0.72 wide. Endites: unmodified. Epigastric area (Figs 4 G, 5 A): surface without external features. Endogyne (Fig. 5 B): with narrow, transverse sclerite (tsc), an anterior stick-shaped sclerite (as), and a posterior large globular structure (glo); transverse bar (tba) with two lateral apodemes (ap).
description
Figs 1, 2 A – D, 3, 4, 5 A – B, 9
diagnosis
Diagnosis. This new species is similar to Trilacuna gongshan Tong, Zhang & Li, 2019, but males can be distinguished by the broad sickle-shaped branch of embolus system (Fig. 3 E, H), and females by the large globular structure of the endogyne (Fig. 5 B). T. gongshan males have three long, tooth-like lobes of embolus system, and females have a very small globular structure of endogyne (Tong et al. 2019: figs 11 B, D, 24 H).
distribution
Distribution. Known only from the type locality (Fig. 9).
etymology
Etymology. The specific name is a noun in apposition from the type locality.
materials_examined
Type material. Holotype: Male (SYNU- 264), Difeng National Park (26 º 10 ' 45.93 '' N, 105 º 28 ' 44.886 '' E, elevation 1438 m), Fengjie County, Chongqing Municipality, China, 23 October 2014, S. Lyu and Y. Tong leg. Paratypes: 2 males (SYNU- 265 – 266) and 3 females (SYNU- 267 – 269), same data as holotype. Other materials examined: 1 male (SYNU- 270) and 3 females (SYNU- 271 – 273), same data as holotype.