Acroterius circinatus, 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 : 20-23

publication ID	https://doi.org/ 10.5852/ejt.2021.743.1293
publication LSID	lsid:zoobank.org:pub:A56D4F5D-FB1D-45C3-943A-EA64C90A3BAD
DOI	https://doi.org/10.5281/zenodo.4665105
persistent identifier	https://treatment.plazi.org/id/826A098B-3362-42BB-95F7-3E3E0C763F04
taxon LSID	lsid:zoobank.org:act:826A098B-3362-42BB-95F7-3E3E0C763F04
treatment provided by	Plazi
scientific name	Acroterius circinatus
status	gen. et sp. nov.

Treatment

Acroterius circinatus View in CoL gen. et sp. nov.

urn:lsid:zoobank.org:act:826A098B-3362-42BB-95F7-3E3E0C763F04

Figs 15–18 View Fig View Fig View Fig View Fig , 39 View Fig

Differential diagnosis

The new species resembles Acroterius brevis gen. et sp. nov. ( Figs 6A–D View Fig , 7A–B View Fig , 8A–D View Fig ) in having a long distal suprategular apophysis and radix with broad circular serrated part, which give rise to the embolus at its distal end in the male palp, parmula with socket on ventral surface and copulatory ducts forming a semicircular loop before joining the spermathecae in epigyne ( Figs 15A–D View Fig , 16A–B View Fig , 17A–D View Fig ); it can be distinguished by the median projection of the distal arm of paracymbium wider than long ( Figs 15B View Fig , 16B View Fig ), but longer than wide in A. brevis gen. et sp. nov. ( Figs 6B View Fig , 7B View Fig ). The embolus basally broad, disk-shaped, robust and almost touches the semicircular serrated part of the radix ( Figs 15A–D View Fig , 16A–B View Fig ), but stout, thread–like and pointing away from the semicircular serrated part of the radix in A. brevis gen. et sp. nov. ( Figs 6A–D View Fig , 7A–B View Fig ). Radical apophysis thumb-shaped, curved ( Figs 15B View Fig , 16B View Fig ), but somewhat triangular in A. brevis gen. et sp. nov. ( Figs 6B View Fig , 7B View Fig ). The spermathecae situated dorso– mesally ( Fig. 17D View Fig ), but situated dorso–laterally in A. brevis gen. et sp. nov. ( Fig. 8D View Fig ).

Etymology

The species name comes from the Latin adjective ‘ circinatus ’, meaning ‘circular’ and referring to the circinate-shaped copulatory ducts in the ventral view of the epigyne.

Type material

Holotype CHINA • ♂; Yunnan Province, Longyang County, Bawan Township, Sancha He , Luoshuidong area ; 24.92597° N, 98.75806° E; alt. 2300 m; 3 Jun. 2005; Charles Griswold leg.; HNU-CGY137 . GoogleMaps

Paratypes (9 ♂♂, 5 ♀♀)

CHINA – Yunnan Province, Longyang County • 7 ♂♂; same collection data as for holotype; HNU-CGY137 GoogleMaps • 2 ♂♂; Bawan Township, Sanchahe, Luoshuidong area ; 24.94755° N, 98.75564° E; alt. 2300 m; 3 Jun. 2005; Heng-mei Yan, Ke-ji Guo and Hong-bin Liang leg.; HNU-GKJ039 GoogleMaps • 3 ♀♀; Bawan Dist., Nankang Yakou ; 24.83178° N, 98.76472° E; alt. 2180 m; 25 May 2005; Charles Griswold and D.H. Kavanaugh leg.; HNU-2005–029A GoogleMaps • 2 ♀♀; Bawan Township, Dasheyao Yakou ; 24.93167° N, 98.75368° E; alt. 2488 m; on top of mountain; 30 May 2005; Heng-mei Yan and Ke-ji Guo leg.; HNU-CGY32 GoogleMaps .

Description

Male (holotype)

MEASUREMENTS AND COLOUR. Total length: 3.25. Carapace 1.56 long, 1.24 wide, cephalic region strongly elevated, yellowish; fovea, cervical and radial grooves distinct; clypeus 0.41 high ( Figs 18A–C View Fig ); abdomen 1.69 long, 1.21 wide ( Fig. 18A–C View Fig ). Eye sizes and interdistances: AME 0.08, ALE 0.09, PME 0.08, PLE 0.09, AME–AME 0.04, PME–PME 0.05, AME–ALE 0.9, PME–PLE 0.12, ALE–ALE 0.44, PLE–PLE 0.48, ALE–PLE contiguous.

CHELICERAE. With five promarginal and five retromarginal teeth.

LENGTH OF LEGS. I = 6.57 (1.71, 2.03, 1.88, 0.95), II = 5.78 (1.62, 1.81, 1.51, 0.84), III = 4.43 (1.29, 1.33, 1.13, 0.68), IV = 5.63 (1.64, 1.68, 1.49, 0.82). Leg formula I–II–IV–III.

PALP ( Figs 15A–D View Fig , 16A–B View Fig ). Paracymbium highly sclerotized, distal part with three projections, lateral projection large, slightly curved, tongue-shaped with blunt end in ventral view; median projection wider than long; ventral projection sclerotized, small with blunt end, strongly overlapping subtegulum ( Figs 15B View Fig , 16B View Fig ); distal suprategular apophysis long, distal part curved and pointing towards tegulum ( Figs 15A–D View Fig , 16A–B View Fig ). Radical apophysis slightly curved with blunt end, protruding upward above base of embolus ( Figs 15A–D View Fig , 16A–B View Fig ); embolic membrane protruding above distal semicircular part, in prolateral view ( Figs 15A View Fig , 16A View Fig ). Embolus highly sclerotized, robust, disk-shaped, almost touching semicircular serrated part of radix with pointed end ( Figs 15A–D View Fig , 16A–B View Fig ).

Female (HNU-CGY137)

MEASUREMENTS AND COLOUR. Total length: 3.38. Carapace 1.42 long, 1.12 wide, yellowish; fovea, cervical and radial grooves distinct; clypeus 0.19 high ( Fig. 18D–F View Fig ); abdomen 1.96 long, 1.61 wide ( Fig. 18D– F View Fig ). Eye sizes and interdistances: AME 0.07, ALE 0.09, PME 0.09, PLE 0.09, AME–AME 0.05, PME– PME 0.06, AME–ALE 0.07, PME–PLE 0.11, ALE–ALE 0.45, PLE–PLE 0.51, ALE–PLE contiguous.

CHELICERAE. With six promarginal and seven retromarginal teeth; reteromarginal teeth gradually decrease in length towards the distal end.

LENGTH OF LEGS. I = 5.32 (1.37, 1.69, 1.32, 0.94), II = 4.75 (1.36, 1.42, 1.15, 0.82), III = 3.43 (1.04, 1.04, 0.79, 0.56), IV = 4.58 (1.26, 1.44, 1.12, 0.76). Leg formula I–II–IV–III.

EPIGYNE. Parmula 0.55 long, 0.24 wide at base ( Fig. 17A–B View Fig ); posterior projection of anterior wall of epigynal plate circular, forming circinate appearance ( Fig. 17A–B View Fig ). Spermathecae slender, situated dorso-mesally near median septum pointing toward lateral walls ( Fig. 17D View Fig ).

Distribution

China (Yunnan Province, Fig. 39 View Fig ).