Acroterius inversus 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 inversus

description: Acroterius inversus gen. et sp. nov.
urn:lsid:zoobank.org:act: 42879150-7E48-4E0F-8C7B-004DDB375847
Figs 22–23, 38
Differential diagnosis
The new species resembles Acroterius camur gen. et sp. nov. (Fig. 13A–D) in having the similar short parmula in epigyne as in A. brevis gen. et sp. nov. and A. longidentatus gen. et sp. nov. (Fig. 22A–D); it can be distinguished by: spermathecae sinuous (Fig. 22D), but hook-shaped in A. camur gen. et sp. nov. (Fig. 13D). Parmula anteriorly rectangular and posteriorly spoon-shaped (Fig. 22A–C), but tongueshaped in A. brevis gen. et sp. nov. (Fig. 8A–C), somewhat triangular in A. camur gen. et sp. nov. (Fig. 13A–C), finger-shaped in A. longidentatus gen. et sp. nov. (Fig. 29A–C).
Etymology
The species name comes from the Latin adjective ‘ inversus ’, meaning ‘inverted’ and referring to the inverted L-shaped spermathecae in the epigyne.
Type material
Holotype CHINA • ♀; Yunnan Province, Lonyang County, Bawan Township, Nankang Yakou; 24.83178° N, 98.76472° E; alt. 2180 m; 25 May 2005; Charles Griswold leg.; HNU-CGY115.
Paratypes (4 ♀♀)
CHINA – Yunnan Province • 2 ♀♀; Lonyang County, Baoshan City, Nankang Yakou (National 320 Road); 24.43717° N, 98.46054° E; alt. 2186 m; 30 Oct. 2003; Guo Tang leg.; HNU-Tang031031 • 1 ♀; Lushui County, Pianma Township, Chanyan He, 9.3 km to Pianma; 25.99363° N, 98.66651° E; alt. 2470 m; mixed broadleaf deciduous and evergreen forest; 13–14 May 2005; Charles Griswold leg.; HNU-CGY105 • 1 ♀; Longling County, Longjiang Township, Xiaoheishan Nature Reserve; 24.82888° N, 98.76001° E; alt. 2020 m; broadleaf forest; 26 May 2005; Charles Griswold leg.; HNU- CGY124.
Description
Female (holotype)
MEASUREMENTS AND COLOUR. Total length: 3.33. Carapace 1.10 long, 1.08 wide, cephalic region slightly elevated, yellowish to light brown; fovea, cervical and radial grooves distinct; clypeus 0.26 high (Fig. 23A–B); abdomen 2.22 long, 1.81 wide (Fig. 23A–B). Eye sizes and interdistances: AME 0.07, ALE 0.09, PME 0.08, PLE 0.07, AME–AME 0.04, PME–PME 0.06, AME–ALE 0.05, PME–PLE 0.11, ALE–ALE 0.44, PLE–PLE 0.48, ALE–PLE contiguous.
CHELICERAE. With six promarginal and six retromarginal teeth.
LENGTH OF LEGS. I = 5.04 (1.41, 1.62, 1.22, 0.79), II = 4.54 (1.37, 1.41, 1.05, 0.71), III = 3.37 (1.12, 0.93, 0.81, 0.51), IV = 4.61 (1.38, 1.42, 1.12, 0.69). Leg formula I–IV–II–III.
EPIGYNE. Posterior median plate extends posteriorly with short parmula with spoon-like deep socket ventrally (Fig. 22A–B); parmula 0.35 long, 0.25 wide at base (Fig. 22A–B); posterior margin of anterior wall of epigynal plate wider than long, with somewhat circle-like projection (Fig. 22A–B); copulatory openings situated inside atrium between anterior wall and posterior median plate (Fig. 22A–B), connected with long, semicircular copulatory ducts joined to spermathecae (Fig. 22D). Spermathecae slender, sinuous, forming almost complete wave (Fig. 22D). Fertilization ducts present laterally on posterior median plate (Fig. 22D).
Male
Unknown.
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 28-31, DOI: 10.5852/ejt.2021.743.1293, http://zenodo.org/record/4664312