Acroterius latus 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 latus

description: Acroterius latus gen. et sp. nov.
urn:lsid:zoobank.org:act: 896C3469-C7F5-4931-ADBF-B423F6513F4A
Figs 24–28, 38
Differential diagnosis
The new species resembles Acroterius longimultus gen. et sp. nov. (Figs 30A–D, 31A–B) in having the distal arm of paracymbium with two projections in the male palp and the long parmula with a median incision in the epigyne (Figs 24A–D, 26A–B); it can be distinguished by: the distal suprategular apophysis short, retained below the apex of cymbium in retrolateral view (Fig. 24B), but long, swordshaped, protruding beyond the apex of cymbium in A. longimultus gen. et sp. nov. (Fig. 30B). The dorsal projection of embolic plate doesn’t touch the base of cymbium in prolateral view (Figs 24A, 26A), but almost touches the base of cymbium in A. longimultus gen. et sp. nov. (Figs 30A, 31A). The lateral projection of the distal arm of the paracymbium is finger-shaped, almost touches the posterior margin of the tibia (Figs 24B, D, 26B), but is tongue-shaped and away from the posterior margin of the tibia in A. longimultus gen. et sp. nov. (Figs 30B, D, 31B). The posterior projection of the anterior wall of the epigynal plate is wider than long and doesn’t protrude beyond the epigastric furrow (Fig. 27A–B), but is longer than wide and protruding beyond the epigastric furrow in A. longimultus gen. et sp. nov. (Fig. 32A–B). The distal part of the spermathecae is hook-shaped (Fig. 27D), but inverted L-shaped in A. longimultus gen. et sp. nov. (Fig. 32D).
Etymology
The species name comes from the Latin adjective ‘ latus ’ meaning ‘broad’, referring to the radical apophysis with a broad distal end in the male palp.
Type material
Holotype CHINA • ♂; Yunnan Province, Lonyang County, Bawan Distr., Nankang Yakou; 24.83178° N, 98.76472° E; alt. 2180 m; 25 May 2005; Charles Griswold and D.H. Kavanaugh leg.; HNU-CGY123.
Paratypes (3 ♀♀)
CHINA – Yunnan Province • 1 ♀; same collection data as for holotype; HNU-CGY123 • 1 ♀; Fugong County, 2 km down Shibali; 27.16284° N, 98.78989° E; alt. 2420 m; 2 May 2004; Guang–xu Peng leg.; HNU-20040502 • 1 ♀; Fugong County, Lishadi Township, Shibali; 27.10520° N, 98.77980° E; alt. 2530 m; 10 Aug. 2005; Guo Tang leg.; HNU-Tang–05–02.
Description
Male (holotype)
MEASUREMENTS AND COLOUR. Total length: 3.55. Carapace 1.84 long, 1.47 wide, cephalic region slightly elevated, dark brown, with longitudinal band starting from base of posterior lateral eyes extending to base of cephalothorax followed by fovea, cervical and radial grooves distinct; clypeus 0.34 high (Fig. 28A–B); abdomen 1.71 long, 1.29 wide. Eye sizes and interdistances: AME 0.06, ALE 0.09, PME 0.07, PLE 0.07, AME–AME 0.07, PME–PME 0.09, AME–ALE 0.11, PME–PLE 0.13, ALE–ALE 0.51, PLE–PLE 0.55, ALE–PLE contiguous.
CHELICERAE. With six promarginal and five retromarginal teeth; distal three teeth of promargin very small (Fig. 25B).
LENGTH OF LEGS. I = 6.59 (1.79, 1.99, 1.67, 1.14), II = 4.88 (1.66, 1.69, 1.32, 1), III = 3.95 (1.34, 1.39, 0.76, 0.46), IV=5.98 (1.74, 1.82, 1.46, 0.96). Leg formula I–IV–II–III.
PALP (Figs 24A–D, 26A–B). Paracymbium highly sclerotized, distal arm with two projections (Figs 24B, 26B), lateral projection finger-like in ventral view and almost touches posterior margin of paracymbium in retrolateral view; ventral projection thumb-like with blunt end; distal suprategular apophysis slightly protruding above cymbium in ventral view (Figs 24D, 26B). Radical apophysis relatively large, tongueshaped, slightly curved with blunt end in ventral view (Figs 24A–D, 26A–B). Embolus stout, short with pointed end (Figs 24A–C, 26A–B).
Female (HNU-CGY123)
MEASUREMENTS AND COLOUR. Total length: 3.03. Carapace 1.26 long, 1.01 wide, cephalic region slightly elevated, dark brown, with a longitudinal band starting from base of posterior lateral eyes extending to base of cephalothorax; fovea, cervical and radial grooves distinct; clypeus 0.25 high (Fig. 28C–D);
abdomen 1.75 long, 1.33 wide. Eye sizes and interdistances: AME 0.07, ALE 0.09, PME 0.07, PLE 0.08, AME–AME 0.05, PME–PME 0.10, AME–ALE 0.08, PME–PLE 0.07, ALE–ALE 0.43, PLE–PLE 0.47, ALE–PLE contiguous.
CHELICERAE. In dorsal view, chelicerae with depression at proximal end slightly below reteromargin with six promarginal and seven retromarginal teeth; reteromarginal teeth gradually decreasing in length towards base of fang (Fig. 25A–B).
LENGTH OF LEGS. I = 4.30 (1.29, 1.48, 0.89, 0.64), II = 4.05 (1.26, 1.34, 0.86, 0.59), III = 2.27 (1.02, 1.06, 0.69, 0.52), IV = 4.39 (1.23, 1.34, 1.03, 0.79). Leg formula I–IV–II–III.
EPIGYNE. Parmula 0.45 long, 0.14 wide at base (Fig. 27A–B); posterior projection of anterior wall of epigynal plate margin of epigyne wider than long, not protruding beyond epigastric furrow (Fig. 27A– B). Spermathecae slender, distal part of spermathecae hook-shaped, slightly curved, pointing towards lateral wall of epigyne (Fig. 27D).
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 31-34, DOI: 10.5852/ejt.2021.743.1293, http://zenodo.org/record/4664312