Acroterius longimultus 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 longimultus

description: Acroterius longimultus gen. et sp. nov.
urn:lsid:zoobank.org:act: A79B8C4E-1540-4031-A067-7F12809D5B95
Figs 30–33, 39
Differential diagnosis
The new species resembles Acroterius latus gen. et sp. nov. (Figs 24A–D, 26A–B) in having the distal arm of the paracymbium with two projections in the male palp and the long parmula with a median incision in the epigyne (Figs 31A–B, 32A–D); it can be distinguished by: the distal suprategular apophysis long, sword-shaped, protruding beyond the apex of cymbium in retrolateral view (Figs 30B, 31B), but short, retained below the apex of cymbium in A. latus gen. et sp. nov. (Figs 24B, 26B). The dorsal projection of the embolic plate almost touches the base of the cymbium in prolateral view (Figs 30A, 31A), but doesn’t touch the base of the cymbium in A. latus gen. et sp. nov. (Figs 24A, 26A). The lateral projection of the distal arm of the paracymbium is tongue-shaped, away from the posterior margin of the tibia (Figs 30B, D, 31B), but finger-shaped, almost touching the posterior margin of the tibia in A. latus gen. et sp. nov. (Figs 24B, D, 26B). The posterior projection of the anterior wall of the epigynal plate is longer than wide, protruding beyond the epigastric furrow (Fig.32A–B), but wider than long, not protruding beyond the epigastric furrow in A. latus gen. et sp. nov. (Fig. 27A–B). The distal part of spermathecae inverted L-shaped (Fig. 32D), but hook-shaped in A. latus gen. et sp. nov. (Fig. 27D).
Etymology
The species name comes from the Latin adjective ‘ longus ’ + ‘ multus ’, meaning ‘long’ + ‘much’ and referring to the very long distal suprategular apophysis in the 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 leg.; HNU-20040501–1.
Paratypes (1 ♂, 1 ♀)
CHINA • 1 ♂, 1 ♀; same collection data as for holotype; HNU-20040501–2.
Description
Male (holotype)
MEASUREMENTS. Total length: 3.18. Carapace 1.53 long, 1.23 wide, cephalic region slightly elevated, brown; fovea, cervical and radial grooves distinct; clypeus 0.21 high (Fig. 33A–B); abdomen 1.65 long, 1.19 wide (Fig. 33A–B). Eye sizes and interdistances: AME 0.07, ALE 0.08, PME 0.07, PLE 0.09, AME–AME 0.04, PME–PME 0.07, AME–ALE 0.08, PME–PLE 0.08, ALE–ALE 0.44, PLE–PLE 0.51.
CHELICERAE. With five promarginal and five retromarginal teeth; teeth of reteromargin almost equal in length.
LENGTH OF LEGS. I = 5.56 (1.39, 1.61, 1.63, 0.93), II = 4.80 (1.32, 1.43, 1.28, 0.77), III = 3.87 (1.21, 1.08, 1.04, 0.54), IV = 5.45 (1.39, 1.73, 1.61, 0.72). Leg formula I–IV–II–III.
PALP (Figs 30A–D, 31A–B). Paracymbium highly sclerotized, distal arm with three projections; lateral projection large, curved, beak-shaped with pointed end in retrolateral view; median projection tongueshaped, wider than long; ventral projection sclerotized, tip curved with blunt end, strongly overlapping subtegulum (Figs 30B, 31B); distal suprategular apophysis much longer than that of all other species in this genus, sword-shaped, protruding above cymbium (Figs 30A–D, 31A–B). Radical apophysis longer than wide, finger-shaped with broad blunt end, pointing towards distal margin of radix in ventral view (Figs 30A–D, 31A–B). Dorsal projection of embolic plate with broad, round end, curved and almost touching base of cymbium in prolateral view (Figs 30A, 31A). Embolus stout, short with pointed end (Figs 30A–C, 31A–B).
Female (HNU-20040501–02)
MEASUREMENTS. Total length: 2.67. Carapace 1.13 long, 0.91 wide, cephalic region slightly elevated, yellowish brown, with longitudinal band starting from base of posterior lateral eyes extending to middorsal; fovea, cervical and radial grooves distinct; Clypeus 0.24 high (Fig. 33D–E); abdomen 1.54 long, 1.16 wide. Eye sizes and interdistances: AME 0.06, ALE 0.08, PME 0.06, PLE 0.07, AME–AME 0.04, PME–PME 0.05, AME–ALE 0.06, PME–PLE 0.09, ALE–ALE 0.39, PLE–PLE 0.42, ALE–PLE contiguous.
CHELICERAE. With five promarginal and five retromarginal teeth. LENGTH OF LEGS. I = 3.88 (1.19, 1.31, 0.86, 0.52), II = 3.74 (1.15, 1.08, 0.88, 0.63), III = 2.62 (0.8, 0.84, 0.61, 0.37), IV = 3.37 (0.93, 1.03, 0.86, 0.55). Leg formula I–II–IV–III.
EPIGYNE. Lateral margin of parmula wave-like on each side (Fig. 32A–C); parmula 0.45 long, 0.15 wide at base (Fig. 32A–C); posterior projection of anterior wall of epigynal plate longer than wide and protruding beyond epigastric furrow (Fig. 32A–B). Spermathecae slender, inverted L-shaped (Fig. 32D).
Distribution
China (Yunnan Province, Fig. 39).
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 39-43, DOI: 10.5852/ejt.2021.743.1293, http://zenodo.org/record/4664312