Ambanus trisaccatus, 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 : 26-27

Ambanus trisaccatus spec. nov.

Figs 13–18

Type material: Holotype male and female paratype, Heshan Station, Changbai Mountain Nature Reserve, Jilin Province, 11 August 2004, Z. S. Zhang & D. Li leg. ( MHBU).

Etymology: The specific name is a Latin adjective, composed by ‘ tri- ’ and ‘ saccatus ’. The former means three and the latter means saccate, referring to the presence of the third saccate depression besides the pair of normal copulatory ducts separated from each other.

Diagnosis: Similar to A. pseudonariceus spec . nov. ( Figs 1–6 ), but dishtinguished by the presence of a small patellar apophysis, the scattered trichobothria on the retrolateral surface of cymbium, the different shapes of conductor anterior branches of male palp and the epigynal atrium with three pits, the copulatory ducts with three vesicles and the small spermathecal heads of female.

Description: Male (holotype) ( Fig. 13 ). Total length 8.26; prosoma 4.28 long, 2.86 wide; opisthosoma 4.28 long, 2.65 wide. Eye sizes and interdistances: AME 0.10, ALE 0.18, PME 0.13, PLE 0.15; AME–AME 0.10, AME–ALE 0.08, PME–PME 0.15, PME–PLE 0.20, ALE–PLE 0.08. MOA 0.40 long, front width 0.30, back width 0.38. Clypeus height 0.20. Leg formula: 4123.

Leg measurements: femur patella+tibia metatarsus tarsus total Male palp ( Figs 16–18 ) with a small patellar apophysis. RTA normal. Lateral tibial apophysis small, with a depressed apex ( Fig. 18 ). Cymbial furrow short (about one third of the length of cymbium). Six trichobothria present on retrolateral cymbium ( Fig. 18 ). Embolus thin and long, originating prolaterally ( Figs 16–17 ). Conductor bifid, each branch grooved. Tip of embolus located on back branch ( Fig. 17 ). Conductor dorsal apophysis present ( Fig. 17 ). Median apophysis reduced, with blunt apex ( Figs 17–18 ).

Female: Total length 10.20; prosoma 5.20 long, 3.37 wide; opisthosoma 5.41 long, 3.37 wide. Eye sizes and interdistances: AME 0.13, ALE 0.20, PME 0.18, PLE 0.18; AME–AME 0.10, AME–ALE 0.10, PME– PME 0.18, PME–PLE 0.25, ALE–PLE 0.10. MOA 0.50 long, front width 0.35, back width 0.50. Clypeus height 0.30.

Leg measurements:

femur patella+tibia metatarsus tarsus total In addition to epigynal atria situated close to epigastric furrow, there is another similar, anteriorly situated depression ( Fig. 14 ). Copulatory ducts broad, originating posteriorly and extending medially between spermathecae ( Fig. 15 ). Spermathecae long, slender, longitudinally extending, highly convolved, and widely separated. Spermathecal heads originated from the anterior apex of spermathecae ( Fig. 15 ).

Distribution: China (Jilin).

Figures

FIGURES 13 – 18. Ambanus trisaccatus spec. nov. 13 Male body, dorsal view. 14 Female epigyne, ventral view. 15 Same, dorsal view. 16 Left male palp, prolateral view. 17 Same, ventral view. 18 Same, retrolateral view. Scale bars: 13, 1.0 mm; 14 – 18, 0.2 mm. C = conductor; CDA = conductor dorsal apophysis.

FIGURES 1 – 6. Ambanus pseudonariceus spec. nov. 1 Male body, dorsal view. 2 Female epigyne, ventral view. 3 Same, dorsal view. 4 Left male palp, prolateral view. 5 Same, ventral view. 6 Same, retrolateral view. Scale bars: 1, 1.0 mm; 2 – 6, 0.2 mm. A = atrium; C = conductor; CD = copulatory duct; CDA = conductor dorsal apophysis; CF = cymbial furrow; E = embolus; FD = fertilization duct; H = hood; LTA = lateral tibial apophysis; MA = medial apophysis; RTA = retrolateral tibial apophysis; S = spermathecae; SH = spermathecal head; ST = subtegulum; T = tegulum; Tr = trichobothrium; TS = tegular sclerite.