Acroterius parvus, Irfan & Bashir & Peng, 2021

Acroterius parvus View in CoL gen. et sp. nov.

urn:lsid:zoobank.org:act:

Figs 37 View Fig , 39 View Fig

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 View Fig ), but tongue-shaped and longer than the median septum in A. brevis gen. et sp. nov. ( Fig. 8A–B, D View Fig ).

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 . GoogleMaps

Paratype ( 1 ♀)

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

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

Male

Unknown.

Distribution

China ( Yunnan Province, Fig. 39 View Fig ).