Agroeca tumida, Mu & Jin & Zhang, 2019

Mu, Yannan, Jin, Chi & Zhang, Feng, 2019, A survey of Agroeca Westring, 1861 from China (Araneae: Liocranidae), Zootaxa 4615 (1), pp. 91-112 : 101-104

Agroeca tumida sp. n.

Figs 10 , 11 D–E

Type material. Holotype ♂, CHINA: Gansu Province, Wuwei City, Minqin County, Lian’gucheng National Nature Reserve (38°25.252′N, 102°54.633′E), 1396 m a.s.l., 23 Aug 2017, leg. Xiao Zang.

Etymology. The specific name is a Latin adjective meaning “inflated”. It refers to the inflated patella of the male palp.

Diagnosis. This new species can be distinguished from all other Agroeca species by the inflated male palpal patella with a thumb-shaped apophysis, the wide and sheet-shaped retrolateral tibial apophysis, and the presence of a small tooth at the base of the RTA.

Description. Male. Holotype ( Figs 10 A–D) total length 4.31. Carapace 2.24 long, 1.80 wide; abdomen 2.07 long, 1.47 wide. Carapace white, margin grey; fovea dark red, with distinct radial grooves; cervical groove indistinct. Eye sizes and interdistances: ALE 0.11, PLE 0.12, PME 0.12, AME 0.09, AME–AME 0.04, AME–ALE 0.04, PME–PME 0.08, PME–PLE 0.08. MOA 0.24 long, 0.31 posterior wide, 0.20 anterior wide. Sternum white. Legs white, tibia I with two pairs of ventral spines, tibia II ventral with one thin prolateral spine, two or three long retrolateral spines. Metatarsi I and II with two pairs of ventral spines. Measurements of legs: leg I 6.62 (1.84+0.82 +1.66+1.36+0.94), leg II 5.60 (1.40+0.66+1.47+1.19+0.88), leg III 6.10 (1.66+0.95+1.12+1.51+0.86), leg IV 9.10 (2.25+1.03+2.03+2.64+1.15).

Palp ( Figs 10 E–G, 11D–E) white, tegulum brown; embolus clavate, slightly curved, with broad base; conductor membranous, behind embolus; median apophysis short, wide and smooth, base of median apophysis membranous. Tegulum wide, translucent, with faint sperm duct. Patella inflated, with distal thumb-shaped apophysis retrolaterally, tip of which is bifurcate; RTA long and wide, sheet-shaped, distally granular, with small tooth at base.

Female: unknown.

Distribution. Known only from the type locality ( Fig. 17 ).

Figures

FIGURE 10. Agroeca tumida sp. n. male, A habitus, dorsal view; B same, ventral view; C cephalothorax, ventral view; D cephalothorax, frontal view; E male left palp, prolateral view; F same, ventral view; G same, retrolateral view. Scale bars: 1 mm (A–B); 0.2 mm (C–G).

FIGURE 11. Agroeca nigra sp. n. (A–C) and A. tumida sp. n. (D–E): A male left palp, prolateral view; B same, ventral view; C same, retrolateral view; D male left palp, ventral view; E same, retrolateral view. Scale bars: 0.25 mm (A–E). Abbreviations: C, conductor; E, embolus; PA, patella apophysis; MA, median apophysis; RTA, retrolateral tibial apophysis; SD, sperm duct; ST, subtegulum; T, tegulum.

FIGURE 17. Distribution in China of the Agroeca species treated in this paper.