Atypus yajuni, Zhu & Zhang & Song & Qu, 2006

Zhu, Ming-Sheng, Zhang, Feng, Song, Daxiang & Qu, Ping, 2006, A revision of the genus Atypus in China (Araneae: Atypidae), Zootaxa 1118, pp. 1-42 : 34-36

Atypus yajuni sp. nov.

( Figs 111–121 )

Type material. Holotype male, paratypes 3 females, CHINA: Anhui Province, Huangshan City, 30°00’N, 118°06’E, Mt Guniujiang , 12 July 1983, Y. J. Xu leg. ( MHBU).

Diagnosis. The new species is similar to A. suiningensis in the shapes of palpal organ and female vulva, but males differ in the pointed and incrassate upper distal corner of conductor being not folded downwards ( Figs 119–121 ); females have the receptacula situated at the anterior margin of the atrium, the receptacula stalks are short, lateral patches of pores extending to middle part ( Figs 114–116 ). Males differ from those of A. sinensis by their conductor with a more pointed upper distal corner and a triangular lower corner ( Figs 119–121 ).

Etymology. The specific name is a first name in honor of the collector Prof. Y. J. Xu.

Description.

Male (holotype). Total length (including chelicerae) 10.35. Carapace 3.60 long, 3.51 wide; abdomen 3.78 long, 2.52 wide. Carapace red brown, with black border and dark stripes, with shallow grooves and pits, lateral margins of carapace almost parallel. Eyes tubercle black, eye region occupying more than one­third of width of pars cephalica. Both eye rows recurved, posterior eye row slightly wider than anterior one. Eye diameters: AME 0.23, ALE 0.18, PME 0.13, PLE 0.18. Distances AME–AME 0.15, AME–ALE 0.08, PME–PME 0.60, PME–PLE 0.00. MOA 0.38 long, front width 0.60, back width 0.78. Fovea transverse, occupying about 1/5 of carapace width at that point. Chelicerae red brown, with 11 teeth on promargin and granular texture on pro­ and retrolateral faces. Anterior lobe of pedipalp coxa red brown, with rows of cuspules. Sternum red brown, with black border, 2.21 long and 2.35 wide. Sigilla normal.

Dorsum of abdomen dark brown, with four transverse pale bands behind black­brown dorsal scutum. ALS 0.37 long, PMS 0.61 long, PLS 2.93 long (basal joint 0.41, median 0.54, subapical 0.44, apical 0.44).

Palpal femur with furrow. Legs I, II red brown, legs III, IV yellow brown. Femur I and II with granular texture. Metatarsus IV with four dorsal spines. Leg formula: 4123.

Male palp ( Figs 119–121 ): tegular tubercle distinct, upper distal corner of male conductor pointed, incrassate, not folded downwards.

Female. Total length (including chelicerae) 17.64. Carapace 4.86 long, 4.32 wide; abdomen 8.64 long, 6.03 wide. Carapace yellow brown, similar to that of male. Eye tubercle black. Eye region occupying nearly one­third of width of pars cephalica. Eye diameters: AME 0.21, ALE 0.25, PME 0.23, PLE 0.18. Distances AME–AME 0.28, AME–ALE 0.13, PME–PME 0.78, PME–PLE 0.03. MOA 0.48 long, front width 0.70, back width 1.08. Fovea transverse, occupying about 1/6 of carapace width at that point. Chelicerae red brown, with 15 teeth on promargin. Anterior lobe of pedipalp coxa similar to that of male. Sternum red brown, with darker border, wider than long; sigilla like those of male.

Abdomen oval and dark gray, with pale longitudinal stripe behind orange dorsal tergite. ALS 0.63 long, PMS 0.90 long, PLS 2.87 long (basal joint 0.81, median 0.81, subapical 0.81, apical 0.44).

Legs of similar color to male. Metatarsus IV with 11–12 dorsal spines. Leg formula: 1423.

Vulva ( Figs 114–116 ): genital atrium long; receptacula situated at anterior margin of atrium, almost equal in size, with short stalks; lateral patches of pores extending to the middle.

Variation. Size range of mature females: carapace length 4.50–4.86, width 4.32–4.41, total length 14.49–17.64, n=3.

Habitat. Found in pursewebs attached to the bases of the China fir or pine trees.

Distribution. China: Anhui.

Figures

FIGURES 111–121. Atypus yajuni sp. nov., 111–116, female paratypes. 111, carapace, dorsal view; 112, left chelicera, inner­lateral view; 113, labium and sternum, ventral view; 114–116, vulvae, dorsal view (from Mt Guniujiang, Anhui). 117–121, male holotype. 117, left chelicera, inner­lateral view; 118, labium and sternum, ventral view; 119, left palp, prolateral view (from Mt Guniujiang, Anhui); 120, left palpal bulb, prolateral view; 121, same, retrolateral view. Scale bars: 111–113, 117–118, 1.0mm; 114–116, 119–121, 0.2mm.