Atypus largosaccatus, 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 : 17-19

Atypus largosaccatus sp. nov.

( Figs 39–49 )

Type material. Holotype male, CHINA: Shaanxi Province, Langao County, 32°02’N, 108°09’E, 2 July 2003, C. X. Yuan leg. ( MHBU); paratypes: 1 female, Hubei Province, Lichuan County, 30°18’N, 108°54’E, September 1977, J. Z. Zhao leg.; 2 females, Hubei Province, Mt Wudang , 32°24’N, 110°54’E, August 1979, J. Z. Zhao leg. ( MHBU).

Diagnosis. A. largosaccatus resembles A. flexus sp. nov. in that the first pair of sigilla are remote from the anterior sternal margin, but can be distinguished by the first pair of sigilla being larger than the second pair ( Figs 41, 45 ); and also in males by the strongly incrassate and normally folded upper corner of the conductor ( Fig. 48 ).

Etymology. The specific name is taken from the Latin “larg”+“saccatus”, adjective, and refers to the large receptacula.

Description.

Male (holotype). Total length (including chelicerae) 12.87. Carapace 4.32 long, 4.86 wide; abdomen 5.94 long, 2.88 wide. Carapace dark red brown. Eye tubercle black. Eye region occupying less than one­third of width of pars cephalica. Both eye rows recurved, anterior eye row narrower than posterior one. Eye diameters: AME 0.23, ALE 0.25, PME 0.18, PLE 0.18. Distances AME–AME 0.24, AME–ALE 0.05, PME–PME 0.73, PME– PLE 0.00. MOA 0.48 long, front width 0.70, back width 1.03. Fovea transverse, wide, occupying about 1/5 of carapace width at that point. Chelicerae black brown, with 13 teeth on promargin and granular texture on pro­ and retrolateral faces. Anterior lobe of pedipalp coxa blackish brown, only inner margins with two irregular rows of cuspules. Sternum dark red brown, with black border, 2.97 long and 3.15 wide. First pair of sigilla remote from anterior sternal margin.

Abdomen black brown, with dorsal scutum red brown. ALS 0.53 long, PMS 0.90 long, PLS 2.38 long (basal joint 0.55, median 0.65, subapical 0.68, apical 0.50).

Palpal femur with furrow. Legs black brown, distal half of metatarsus and tarsus yellow brown. Femora I, II with granular texture. Metatarsus IV with 2–3 dorsal spines. Leg formula: 4123.

Male palp ( Figs 46–49 ): conductor short, its upper corner small, strongly swollen and normally folded, lower distal corner triangular.

Female. Total length (including chelicerae) 18.45. Carapace 5.31 long, 5.67 wide; abdomen 9.45 long, 6.84 wide. Carapace yellowish brown, otherwise as in male. Eye region occupying slightly less than one­third of width of pars cephalica. Eye arrangement as in male. Eye diameters: AME 0.22, ALE 0.27, PME 0.20, PLE 0.20. Distances AME– AME 0.24, AME–ALE 0.17, PME–PME 0.75, PME–PLE 0.00. MOA 0.51 long, front width 0.68, back width 1.09. Fovea transverse, occupying about 1/10 of carapace width at that point. Chelicerae reddish brown, with 13 teeth on promargin. Labium wider than long with four cuspules distally. Anterior lobe of pedipalp coxa reddish brown, with many cuspules on inner margins and inner half of ventral sides. Sternum wider than long, first pair of sigilla larger than second pair.

Abdomen purple brown, dorsal tergite orange. ALS 0.50 long, PMS 1.00 long, PLS 3.45 long (basal joint 0.70, median 0.75, subapical 1.00, apical 1.00 long).

Legs yellow brown. Metatarsus IV with 21–24 dorsal spines. Leg formula: 1423.

Vulva ( Figs 42–43 ): atrium short, pore patches small and rounded, receptacula pyriform and equal in size and distance from each other, basal stalks of receptacula thin.

Variation. Size range of mature females: carapace length 5.31–5.40, width 5.67–5.76, total length 18.45–18.99, n=3.

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

Distribution. China: Shaanxi, Hubei.

Remarks. Although males and females were not collected from the same locality, they are considered conspecific because the first pair of sigilla are remote from the anterior margin of the sternum in both males and females. Their collecting localities are actually close to each other.

Figures

FIGURES 39–49. Atypus largosaccatus sp. nov., 39–43, female paratypes. 39, carapace, dorsal view; 40, left chelicera, inner­lateral view; 41, labium and sternum, ventral view; 42–43, vulvae, dorsal view (42, from Lichuan, Hubei; 43, from Mt Wudang, Hubei). 44–49, male holotype. 44, left chelicera, inner­lateral view; 45, labium and sternum, ventral view; 46, male left palp, prolateral view (from Langao, Shaanxi); 47, left palpal bulb, prolateral view; 48, same, retrolateral view; 49, same, dorsal view. Scale bars: 39–41, 44–45, 1.0mm; 42–43, 46–49, 0.2mm.