Acroterius parvus, Irfan & Bashir & Peng, 2021

Irfan, Muhammad, Bashir, Shahida & Peng, Xianjin, 2021, Acroterius gen. nov. (Araneae: Linyphiidae: Linyphiinae) with twelve new species from Yunnan, China, European Journal of Taxonomy 743, pp. 1-53 : 48-50

Acroterius parvus gen. et sp. nov.

urn:lsid:zoobank.org:act:959DFFDC-D4A9-41C5-B099-B7AA5047F2D8

Figs 37 , 39

Differential diagnosis

The new species resembles Acroterius brevis gen. et sp. nov. in having similar hook-shaped spermathecae; it can be distinguished by the triangular parmula, shorter than the median septum in the new species ( Fig. 37A, D ), but tongue-shaped and longer than the median septum in A. brevis gen. et sp. nov. ( Fig. 8A–B, D ).

Etymology

The species name comes from the Latin adjective ‘ parvus ’, meaning ‘small’, referring to the small parmula of the epigyne.

Type material

Holotype CHINA • ♀; Yunnan Province, Gongshan County, Bingzhongluo Township, Chukuai ; 27.97928° N, 98.47389° E; alt. 3725 m; 19 Aug. 2006; Peng Hu leg.; HNU-Hu060819 .

Paratype (1 ♀)

CHINA • 1 ♀; same collection data as for holotype; HNU-Hu060819 .

Description

Female (holotype)

MEASUREMENTS AND COLOUR. Total length: 4.15. Carapace 1.60 long, 2.90 wide, cephalic region slightly elevated, brown, dorsally with dark brown longitudinal band starting from base of posterior eyes extending to proximal part of cephalothorax; fovea, cervical and radial grooves distinct; clypeus 0.41 high ( Fig. 37E–F ); abdomen 2.55 long, 2.35 wide. Eye sizes and interdistances: AME 0.13, ALE 0.1, PME 0.09, PLE 0.12, AME–AME 0.06, PME–PME 0.08, AME–ALE 0.07, PME–PLE 0.12, ALE–ALE 0.51, PLE–PLE 0.62, ALE–PLE 0.03.

CHELICERAE. With six promarginal and six retromarginal teeth; reteromarginal teeth long and highly sclerotized.

LENGTH OF LEGS. I = 7.25 (1.97, 2.24, 1.83, 1.21), II = 6.48 (1.87, 1.89, 1.69, 1.03), III = 4.63 (1.52, 1.34, 1.16, 0.61), IV = 6.02 (1.75, 1.84, 1.54, 0.89). Leg formula I–II–IV–III.

EPIGYNE. Posterior median plate extends posteriorly with small triangular parmula, wider than long ( Fig. 37A–B ); parmula 0.26 long, 0.26 wide at base ( Fig. 37A–B ); posterior projection of anterior wall of epigynal plate circular in ventral view, somewhat triangular in lateral view on each side ( Fig. 37A–B ). Spermathecae slender, distal part slightly curved and pointing towards fertilization ducts ( Fig. 37D ).

Male

Unknown.

Distribution

China (Yunnan Province, Fig. 39 ).

Figures

Fig. 37. Acroterius parvus gen. et sp. nov., ♀, holotype (HNU-Hu060819). A–B. Epigyne, ventral view. C. Epigyne, lateral view. D. Vulva, dorsal view. E. Habitus, dorsal view. F. Habitus, ventral view.

Fig. 39. Map indicating the type localities of Acroterius circinatus sp. nov. (), A. longidentatus sp. nov. (), A. longimultus sp. nov. (), A. longiprojectus sp. nov. (), A. ovatus sp. nov. () and A. parvus sp. nov. ().

Fig. 8. Acroterius brevis gen. et sp. nov., ♀, paratype (HNU-20040501–2). A–B. Epigyne, ventral view. C. Epigyne, lateral view. D. Vulva, dorsal view.