Ambanus triangulatus, Zhang, Zhi-Sheng, Zhu, Ming-Sheng & Song, Da-Xiang, 2007

Zhang, Zhi-Sheng, Zhu, Ming-Sheng & Song, Da-Xiang, 2007, Three new species of the genus Ambanus Ovtchinnikov, 1999 from China (Araneae: Amaurobiidae: Coelotinae), Zootaxa 1425, pp. 21-28 : 24-26

Ambanus triangulatus spec. nov.

Figs 7–12

Type material: Holotype male, 1 male and 1 female paratypes from Changbai Mountain Nature Reserve, Jilin Province, China, 9 August 2004, Z. S. Zhang & D. Li leg. ( MHBU); 4 female paratypes from Heshan Station, Changbai Mountain Nature Reserve, Jilin Province, China, 11 August 2004, Z. S. Zhang & D. Li leg. ( MHBU); female paratype from Mt. Changbai, Jilin Province, China, 26 July 1987 ( MHBU).

Etymology: The specific name is a Latin adjective, referring to the triangular shape of the spermathecae.

Diagnosis: Resembling A. paiki ( Ovtchinnikov 1999: 66, figs 12–15), but distinguished by the small and simple conductor, the relative small atrium, the triangular shaped spermathecae, and the posteriorly originated spermathecal heads.

Description: Male (holotype) ( Fig. 7 ). Total length 7.85; prosoma 4.18 long, 2.75 wide; opisthosoma 3.98 long, 2.45 wide. Eye sizes and interdistances: AME 0.08, ALE 0.18, PME 0.13, PLE 0.15; AME–AME 0.13, AME–ALE 0.08, PME–PME 0.13, PME–PLE 0.20, ALE–PLE 0.08. MOA 0.40 long, front width 0.28, back width 0.38. Clypeus height 0.25. Leg formula: 4123.

Leg measurements:

femur patella+tibia metatarsus tarsus total Male palp ( Figs 10–12 ) without patellar apophysis. RTA and lateral tibial apophysis present ( Fig. 12 ). Cymbial furrow distinct, its length about one third of cymbium length. Five trichobothria located close to the apex of cymbial furrow ( Fig. 12 ). Embolus long and strong ( Figs 10–11 ). Conductor simple, with a deep groove. Conductor dorsal apophysis small ( Figs 11–12 ). Median apophysis reduced to a small and less sclerotized apophysis ( Figs 11–12 ).

Female (one of the paratypes): Total length 8.36; prosoma 4.18 long, 2.86 wide; opisthosoma 4.49 long, 2.75 wide. Eye sizes and interdistances: AME 0.13, ALE 0.18, PME 0.13, PME 0.15; AME–AME 0.10, AME–ALE 0.08, PME–PME 0.15, PME–PLE 0.25. MOA 0.43 long, front width 0.35, back width 0.43. Clypeus height 0.25.

Leg measurements:

Epigyne with a relatively small atrium ( Fig. 8 ). Copulatory ducts saccate, extending anteriorly ( Fig. 9 ). Spermathecae triangular in shape. Spermathecal bases small, widely separated. Spermathecal stalks broad, with tiny spermathecal heads ( Fig. 9 ).

Variation: Body length ranges, males 7.65–7.85, females 6.83–9.59. Distribution: China (Jilin).

Figures

FIGURES 7 – 12. Ambanus triangulatus spec. nov. 7 Male body, dorsal view. 8 Female epigyne, ventral view. 9 Same, dorsal view. 10 Left male palp, prolateral view. 11 Same, ventral view. 12 Same, retrolateral view. Scale bars: 7, 1.0 mm; 8 – 12, 0.2 mm. C = conductor; CDA = conductor dorsal apophysis.