Acroterius absentus gen. et sp. nov.

urn:lsid:zoobank.org:act: 4E49A779-9374-40FB-B842-BEECDAD450A4

Figs 1–4, 38

Differential diagnosis

The new species can be distinguished from all other species of Acroterius gen. nov. by the absence of radical apophysis (Figs 1A–C, 3A–B).

Etymology

The species name comes from the Latin adjective ‘ absens ’, meaning ‘absent’, referring to the radical apophysis absent in male palp.

Type material

Holotype CHINA • ♂; Yunnan Province, Baoshan City, Nankang Yakou (National 320 Road); 24.43717° N, 98.46054° E; alt. 2186 m, 27 Oct. 2003; Guo Tang leg.; HNU-Tang031027.

Description

Male (holotype)

MEASUREMENTS AND COLOUR. Total length: 3.61. Carapace 1.34 long, 1.14 wide, cephalothorax yellowish to light brown; clypeus 0.56 high (Fig. 4A–B); abdomen 2.27 long, 0.89 wide. Eye sizes and interdistances:

AME 0.09, ALE 0.12, PME 0.09, PLE 0.11, AME–AME 0.05, PME–PME 0.08, AME–ALE, 0.12,

PME–PLE 0.11, ALE–ALE 0.54, PLE–PLE 0.61, ALE–PLE contiguous.

CHELICERAE. With five promarginal and five retromarginal teeth, promargin with deep depression and with small teeth except proximal two long; proximal second tooth much longer and almost touching upper margin of fang, distal three teeth small (Fig. 2A–B).

LENGTH OF LEGS. I = 7.48 (1.89, 2.48, 2.03, 1.08), II = 5.9 (1.83, 1.92, 1.32, 0.83), III = 4.11 (1.41, 1.16, 0.97, 0.57), IV = 5.52 (1.72, 1.69, 1.49, 0.62). Leg formula I–II–IV–III.

PALP (Figs 1A–D, 3A–B). Paracymbium highly sclerotized, distal part with three projections (Figs 1B, 3B), lateral projection small, triangular; median projection broad, tongue-shaped and ventral projection thumb-like (Figs 1B, 3B); the distal suprategular apophysis robust with pointed end (Figs 1A–C, 3A–B); radical apophysis absent (Figs 1A–C, 3A–B). Embolus originating from distal serrated part of radix, stout, short with pointed end (Figs 1A–C, 3A–B).

Female

Unknown.

Distribution

China (Yunnan Province, Fig. 38).