Acroterius brevis Irfan & Bashir & Peng 2021, gen. et sp. nov.
Creators: name: Irfan, Muhammad
name: Bashir, Shahida
name: Peng, Xianjin
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Linyphiidae
Acroterius
Acroterius brevis

description: Acroterius brevis gen. et sp. nov.
urn:lsid:zoobank.org:act: F041D21F-15E7-4C22-895A-4AF2565105D4
Figs 5–9, 38
Differential diagnosis
The new species resembles A. camur gen. et sp. nov. in distal arm of paracymbium with three projection (Figs 6B, 7B, 10B, 11B), but can be distinguished from A. camur gen. et sp. nov. and all other Acroterius gen. nov. species by the ventral view, radical apophysis triangular and reaches to base of embolus (Figs 6D, 7A), but thumb-shaped and extends above embolus in A. camur gen. et sp. nov. (Figs 10D 12A). Spermathecae L-shaped, present near posterior median plate (Fig. 8A–B), but hook-shaped and separated by one and half-length of spermathecae in A. camur gen. et sp. nov. (Fig. 13A–B). Parmula 0.47 long (Fig. 8D), but 0.21 long in A. camur gen. et sp. nov. (Fig. 13D).
Etymology
The species name comes from the Latin adjective ‘ brevis ’ meaning ‘short’, referring to the short radical apophysis in male palp.
Type material
Holotype CHINA • ♂; Yunnan Province, Fugong County, Lumadeng Township, Yaping Village, Shibali; 27.16515° N, 98.77975° E; alt. 2527 m; 1 May 2004; Guang-xu Peng leg.; HNU-20040501–1.
Paratypes (2 ♀♀)
CHINA • 1 ♀, same collection data as for holotype; HNU-20040501–2 • 1 ♀; Yunnan Province, Fugong County, Yaping, 3 km to Shibali; 27.1775° N, 98.7550° E; alt. 2527 m; 4 May 2004; Heng-mei Yan and Guang-xu Peng leg.; HNU-20040504.
Description
Male (holotype)
MEASUREMENTS AND COLOUR. Total length: 2.66. Carapace 1.40 long, 1.14 wide, cephalothorax dark brown; clypeus 0.56 high (Fig. 9A–B); abdomen 2.03 long, 1.60 wide. Eye sizes and interdistances: AME 0.08, ALE 0.09, PME 0.08, PLE 0.07, AME–AME 0.03, PME–PME 0.06, AME–ALE 0.08, PME–PLE 0.07, ALE–ALE 0.45, PLE–PLE 0.49.
CHELICERAE. With four promarginal and four retromarginal teeth; proximal teeth of reteromargin much longer than distal one.
LENGTH OF LEGS. I = 4.89 (1.63, 1.47, 1.16, 0.63), II = 3.74 (1.11, 1.31, 0.83, 0.49), III = 3.17 (0.88, 0.96, 0.82, 0.51), IV = 4.35 (1.26, 1.26, 1.17, 0.66). Leg formula I–IV–II–III.
PALP (Figs 6A–D, 7A–B). Paracymbium highly sclerotized, distal arm with three projections; lateral projection large, curved, beak-shaped; median projection tongue-shaped; ventral projection sclerotized, thumb-shaped with blunt end, overlapping subtegulum (Figs 6B, 7B); distal suprategular apophysis long, robust with distal pointed end (in ventral view) (Figs 6B–D, 7B). Radix with small radical apophysis
with pointed end (Figs 6A–D, 7A–B); radical apophysis somewhat triangular with blunt end (Figs 6A, 7A). Embolus stout, short with pointed end (Figs 6A–D, 7A–B).
Female (HNU-20040501–2, Fig. 9C–D)
MEASUREMENTS AND COLOUR. Total length: 2.97. Carapace 0.94 long, 0.83 wide, cephalothorax dark brown; fovea, cervical and radial grooves distinct; clypeus 0.27 high (Fig. 9C–D); abdomen 1.8 long, 1.05 wide. Eye sizes and interdistances: AME 0.06, ALE 0.09, PME 0.08, PLE 0.07, AME–AME 0.06, PME–PME 0.07, AME–ALE 0.07, PME–PLE 0.07, ALE–ALE 0.41, PLE–PLE 0.45, ALE–PLE contiguous.
LENGTH OF LEGS. I = 4.40 (1.23, 1.39, 1.03, 0.75), II = 3.92 (1.15, 1.28, 0.91, 0.58), III = 3.07 (0.94, 0.93, 0.71, 0.49), IV = 4.11 (1.13, 1.35, 0.96, 0.67). Leg formula I–IV–II–III. Tm I and Tm IV present. Patella of each leg with two spines. Tibial dorsal spine formula: 2–2–2–2.
EPIGYNE. Parmula 0.47 long, 0.41 wide at base (Fig. 8A–C); the posterior margin of the anterior wall of epigynal plate with a beak-shaped projection on each side (Fig. 8A–C). Spermathecae slender, L-shaped (Fig. 8D).
Distribution
China (Yunnan Province, Fig. 38).
description: Published as part of Irfan, Muhammad, Bashir, Shahida & Peng, Xianjin, 2021, Acroterius gen. nov. (Araneae: Linyphiidae: Linyphiinae) with twelve new species from Yunnan, China, pp. 1-53 in European Journal of Taxonomy 743 on pages 8-14, DOI: 10.5852/ejt.2021.743.1293, http://zenodo.org/record/4664312