Acroterius longiprojectus, Irfan & Bashir & Peng, 2021

Irfan, Muhammad, Bashir, Shahida & Peng, Xianjin, 2021, Acroterius gen. nov. (Araneae: Linyphiidae: Linyphiinae) with twelve new species from Yunnan, China, European Journal of Taxonomy 743, pp. 1-53 : 44

Acroterius longiprojectus gen. et sp. nov.

urn:lsid:zoobank.org:act:5E2F3303-07EE-4A75-9FE8-62EC8372BB8C

Figs 34, 39

Differential diagnosis

The new species resembles Acroterius hamatus gen. et sp. nov. ( Fig. 19A–D) in having long parmula in epigyne ( Fig. 34B–E); it can be distinguished by: the posterior projection of the anterior wall of the epigynal plate longer than wide ( Figs 34B–C), but wider than long in A. hamatus gen. et sp. nov. ( Figs 19A–B, 21A–B). In ventral view, the distal part of parmula is not expanded ( Fig. 34B–C), but distinctly expanded in A. hamatus gen. et sp. nov. ( Fig. 19A–B). The spermathecae are not curved ( Fig. 34E), but the tip is curved, pointing towards the posterior margin of the epigyne in A. hamatus gen. et sp. nov. ( Figs 19D, 21D).

Etymology

The species name comes from the Latin adjective ‘ longus ’ + ‘ projectus ’ meaning ‘long’ + ‘projection’, referring to the long posterior projection of the anterior wall of the epigynal plate in the epigyne.

Type material

Holotype

CHINA • ♀; Yunnan Province, Fugong County, Lumadeng Township, Yakou of old Shibali ; 27.06430° N, 98.75123° E; alt. 3270 m; 13 Aug. 2005; Guo Tang leg.; HNU-Tang–05–06.

Description

Female (holotype)

MEASUREMENTS AND COLOUR. Total length: 3.15. Carapace 1.33 long, 0.97 wide, cephalic region slightly elevated, brown, dorsally with distinct pattern starting from base of posterior eyes extending to proximal part of cephalothorax; fovea, cervical and radial grooves distinct; clypeus 0.26 high ( Fig. 34A);Abdomen 1.83 long, 1.48 wide ( Fig. 34A). Eye sizes and interdistances: AME 0.06, ALE 0.08, PME 0.06, PLE 0.07 AME–AME 0.04, PME–PME 0.06, AME–ALE 0.07, PME–PLE 0.09, ALE–ALE 0.42, PLE–PLE 0.45, ALE–PLE contiguous.

CHELICERAE. With six promarginal and six retromarginal teeth; reteromarginal teeth long and highly sclerotized.

LENGTH OF LEGS. I = 4.66 (1.14, 1.35, 1.2, 0.77), II = 3.78 (0.95, 1.2, 1.11, 0.52), III = 2.45 (0.84, 1.02, 1.11, 0.49), IV = 4.16 (1.17, 1.23, 1.11, 0.65). Leg formula I–IV–II–III.

EPIGYNE. Parmula 0.49 long, 0.27 wide at base ( Fig. 34B–C); posterior projection of anterior wall of epigynal plate longer than wide on either side ( Fig. 34B–C). Spermathecae slender, long, almost touches lateral wall of epigyne on each side ( Fig. 34E).

Male

Unknown.

Distribution

China (Yunnan Province, Fig. 39).