Acroterius longidentatus, 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 : 37-39

Acroterius longidentatus gen. et sp. nov.

urn:lsid:zoobank.org:act:F372CAB7-6C3F-403D-809D-4FDA72FB7B10

Figs 29 , 39

Differential diagnosis

The new species resembles Acroterius brevis gen. et sp. nov. ( Fig. 8A–D ) in having a similar short parmula as in A. camur gen. et sp. nov. and A. longidentatus gen. et sp. nov. and the C-shaped distal part of spermathecae in epigyne ( Fig. 29A–D ); it can be distinguished by: the posterior projection of the anterior wall of the epigynal plate C-shaped in ventral view, somewhat triangular in lateral view and retained below the lateral margin of anterior wall of the epigyne in the new species ( Fig. 29A–C ), but beak-shaped in ventral view, protruding above the lateral margin in A. brevis gen. et sp. nov. ( Fig. 8A–C ). The spermathecae are situated near the median septum ( Fig. 29D ), but situated away from the median septum in A. brevis gen. et sp. nov. ( Fig. 8D ). Parmula finger-shaped ( Fig. 29A–C ), but tongue-shaped in A. brevis gen. et sp. nov. ( Fig. 8A–C ), anteriorly rectangular and posteriorly spoon-shaped in A. inversus gen. et sp. nov. ( Fig. 22A–C ) and somewhat triangular in A. camur gen. et sp. nov. ( Fig. 13A–C ).

Etymology

The species name comes from the Latin adjective ‘ longus ’ + ‘ dentatus ’, meaning ‘long’ + ‘teeth’ and referring to the long and highly sclerotized teeth on the retrolateral margin of the chelicerae in the female.

Type material

Holotype CHINA • ♀; Yunnan Province, Longling County, Longjiang Township, Xiaoheishan Nature Reserve ; 24.82888° N, 98.76001° E; alt. 2020 m; broadleaf forest; 28 May 2005; Charles Griswold and D.H. Kavanaugh leg.; HNU-2002–033A .

Paratypes (5 ♀♀)

CHINA – Yunnan Province • 4 ♀♀; same collection data as for holotype; HNU-2002–033A • 1 ♀; Longling County, Longjiang Township, Xiaoheishan Nature Reserve ; 24.83671° N, 98.76185° E; alt. 2067 m; hand collecting; 28 May 2005; Heng-mei Yan and Guo Ke-ji leg.; HNU-GKJ029 .

Description

Female (holotype)

MEASUREMENTS AND COLOUR. Total length: 3.73. Carapace 1.27 long, 1.18 wide, cephalic region slightly elevated, yellowish brown, with distinct pattern starting from the base of posterior median eyes; fovea, cervical and radial grooves distinct; clypeus 0.27 high ( Fig. 29E–F ); abdomen 2.47 long, 1.81 wide. Eye sizes and interdistances: AME 0.07, ALE 0.11, PME 0.08, PLE 0.08, AME–AME 0.05, PME–PME 0.08, AME–ALE 0.11, PME–PLE 0.09, ALE–ALE 0.51, PLE–PLE 0.55, ALE–PLE contiguous.

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

LENGTH OF LEGS. I = 6.13 (1.67, 1.95, 1.55, 0.96), II = 5.50 (1.45, 1.75, 1.51, 0.79), III = 3.50 (0.98, 1.07, 0.91, 0.54), IV = 5.02 (1.23, 1.61, 1.36, 0.82). Leg formula I–II–IV–III.

EPIGYNE. Parmula 0.36 long, 0.23 wide at base ( Fig. 29B ); the posterior projection of anterior wall of epigynal plate circular in ventral view; somewhat triangular and retained below lateral wall of epigynal plate in lateral view ( Fig. 29A–C ). Spermathecae slender, distal part C-shaped and situated near median septum ( Fig. 29D ).

Male

Unknown.

Distribution

China (Yunnan Province, Fig. 39 ).

Figures

Fig. 29. Acroterius longidentatus gen. et sp. nov., ♀, holotype (HNU-2002–033A). A–B. Epigyne, ventral view. C. Epigyne, lateral view. D. Vulva, dorsal view. E. Habitus, dorsal view. F. Habitus, ventral view.

Fig. 39. Map indicating the type localities of Acroterius circinatus sp. nov. (), A. longidentatus sp. nov. (), A. longimultus sp. nov. (), A. longiprojectus sp. nov. (), A. ovatus sp. nov. () and A. parvus sp. nov. ().

Fig. 8. Acroterius brevis gen. et sp. nov., ♀, paratype (HNU-20040501–2). A–B. Epigyne, ventral view. C. Epigyne, lateral view. D. Vulva, dorsal view.

Fig. 22. Acroterius inversus gen. et sp. nov., ♀, holotype (HNU-CGY115). A–B. Epigyne, ventral view. C. Epigyne, lateral view. D. Vulva, dorsal view.

Fig. 13. Acroterius camur gen. et sp. nov., ♀, paratype (HNU-DHK–2002–038). A–B. Epigyne, ventral view. C. Epigyne, lateral view. D. Vulva, dorsal view.