Myrmarachne yinae Wang, Mi & Peng sp. nov.

urn:lsid:zoobank.org:act: A7D47CA2-0093-4219-802A-6D98FF0496A9

Figs 10–11, 56

Diagnosis

The female of Myrmarachne yinae sp. nov. can be easily distinguished from other congeners by the epigyne having a pair of wing-shaped dorsolateral plates and an upwards opened hood (Fig. 11A–C), whereas similar plates being absent and with downwards or laterally opened hood in others (Metzner 2023). The male closely resembles that of M. concava Zhu, Zhang, Zhang & Chen, 2005 in palpal structure, but it can be distinguished by the RTA, which is curved into a pointed tip directed towards the dorsal side in retrolateral view (Fig. 10C), whereas straight and acutely narrowed to a pointed tip directed upward in M. concava (Zhu et al. 2005: fig. 10f).

Etymology

The specific name is a patronym in honor of the late Prof. Changmin Yin, one of the pioneers of spider taxonomy of China; noun (name) in genitive case.

Type material

Holotype

CHINA • ♀; Guizhou, Suiyang County, Kuankuoshui National Nature Reserve, Zhubaotai; 28°12.71′ N, 107°10.01′ E; 1513 m a.s.l.; 26 Jul. 2015; C. Wang et al. leg.; TRU-JS 0114.

Paratypes

CHINA • 2 ♀♀, 1 ♂; same collection data as for holotype; TRU-JS 0115–0117 • 2 ♀♀; Yinjiang County, Ziwei Township, Fanjing Mountain National Nature Reserve, Huguosi; 27°54.54′ N, 108°46.57′ E; 1655 m a.s.l.; 9 May 2020; X.Q. Mi et al. leg.; TRU-JS 0118–0119 • 2 ♂♂; same collection data as for preceding; 21 Jul. 2021; TRU-JS 0120–0121 .

Description

Female (holotype)

MEASUREMENTS. Total length 6.18. Carapace 2.64 long, 1.37 wide. Abdomen 3.42 long, 1.53 wide. Eye sizes and interdistances: AME 0.47, ALE 0.24, PLE 0.24, AERW 1.36, PERW 1.42, EFL 1.03. Legs: I 4.83 (1.45, 0.78, 1.45, 0.75, 0.40), II 3.82 (1.13, 0.63, 1.01, 0.65, 0.40), III 4.41 (1.25, 0.58, 1.05, 1.08, 0.45), IV 6.46 (1.88, 0.75, 1.75, 1.58, 0.50).

HABITUS. Carapace dark brown except yellow-brown on cervical groove area, cephalic region elevated, square, covered with gray-white, thin setae (Fig. 11D–E). Chelicerae with six teeth on both retromargin and promargin (Fig. 11H). Sternum narrow, about 2.5 times as long as wide (Fig. 11F). Legs yellow to red-brown, with two, six, and two pairs of macrosetae on venter of patellae, tibiae, and metatarsi I, respectively (Fig. 11D). Abdomen elongated, constricted anteromedially, dorsum with alternate transverse dark brown and yellow bands; venter pale yellow (Fig. 11D–F).

EPIGYNE. With small, upward opened, cup-shaped posterior hood, and a pair of wing-shaped, sclerotized dorsolateral plates; atrium broad, sub-trapezoidal, with a pair of lateral ridges and two pairs of wrinkles; copulatory openings posterolaterally located, slit-shaped; sclerotized portions of copulatory ducts broadened, curved and with a pair of accessory glands at proximal portions, and then extended anteriorly, and coiled with five spirals at terminus; spermathecae tube-shaped; fertilization ducts slender, extended anterolaterally (Fig. 11A–C).

Male (paratype, TRU-JS 0117)

MEASUREMENTS. Total length 4.89. Carapace 2.16 long, 1.33 wide. Abdomen 2.51 long, 1.05 wide. Eye sizes and interdistances: AME 0.42, ALE 0.22, PLE 0.22, AERW 1.27, PERW 1.31, EFL 1.02. Legs: I 4.94 (1.48, 0.75, 1.45, 0.78, 0.48), II 3.91 (1.13, 0.60, 1.10, 0.68, 0.40), III 4.35 (1.25, 0.55, 1.05, 1.00, 0.50), IV 5.96 (1.70, 0.70, 1.63, 1.43, 0.50).

HABITUS. Similar to that of female except paler in color, and with more well-developed chelicerae (Fig. 11G).

PALP. Tibia longer than wide, with lamellar flange fused with RTA basally; RTA twisted, curved, and extended towards dorsal side distally in retrolateral view; cymbium setose, with cluster of dense, dark setae dorsomedially, and sub-triangular, baso-retrolateral apophysis in ventral view; bulb oval; embolus long, coiled with about two spirals, distal portion flagelliform (Fig. 10).

Distribution

China (Guizhou) (Fig. 56).