Sidydrassus saiynovi, Fomichev, 2022

Fomichev, Alexander A., 2022, A survey of the East Palaearctic Gnaphosidae (Araneae). 12. A review of Sidydrassus Esyunin & Tuneva, 2002, Zootaxa 5194 (2), pp. 260-272 : 261-264

Sidydrassus saiynovi sp. n.

Figs 1, 7 , 13–15 , 19–21 , 44

Type. KAZAKHSTAN: Mangystau Oblast: holotype ♂ ( ISEA, 001.8936), Ustyurt Nature Reserve, Mamekkazgan Guard Post, near Karazhar Well , 43°24’52”N, 54°33’48”E, takyr, 70 m, 12– 14.04.2018, A.A. Fomichev .

Etymology. The specific name is a patronym honouring Mr Berik Saiynov (Zhanaozen, Kazakhstan), a research fellow from the Ustyurt Nature Reserve, who helped the author to organize an expedition to Ustyurt Plateau, during which this new species was collected.

Diagnosis. In having the large median apophysis (Ma) without a prolateral bent branch, the male of the new species resembles that of S. tianschanicus , from which it differs in having the RTA of the same length as tibia (vs. twice shorter in S. tianschanicus ), the embolus (Em) bent prolaterad (vs. straight in S. tianschanicus ) and the median apophysis twice as short as the embolus (vs. equal to it in S. tianschanicus ) (cf. Figs 13–15 , 20 and 16–18 , 23 ).

Description. Male. Total length 7.8. Carapace: 3.55 long, 2.45 wide. Colouration. Carapace and sternum yellow-brown. Labium, endites and chelicerae brown. Coxae pale yellow. Legs pale yellow. Palps pale yellow, cymbium brown. Abdomen beige, ventrally lighter. Spinnerets pale yellow. Leg measurements: I: 3.15, 1.65, 2.8, 2.45, 1.7 (11.75). II: 2.95, 1.4, 2.65, 2.35, 1.65 (11.0). III: 2.85, 1.3, 2.25, 2.4, 1.65 (10.45). IV: 3.6, 1.5, 3.0, 3.7, 1.85 (13.65). Leg spination: I: Fe d1-1-0 p0-1-1; Ti v1-2-0; Mt v2-0-0. II: Fe d1-1-0 p0-1-2; Ti v0-2-0; Mt v3-0-0. III: Fe d1-1-1 p0-1-1 r0-1-1; Ti d1-0-0 p2-0-1 r1-0-1 v2-2-2; Mt d1-2-0 p1-1-0 r1-1-0 v2-2-0. IV: Fe d1-1-1 p0-1-1 r0-1-1; Ti d1-0-1 p1-1-1 r2-0-1 v2-2-2; Mt d1-2-0 p1-1-0 r1-1-0 v2-0-2.

Palp as in Figs 13–15 , 19–21 . Tegulum (Te) 1.8 times longer than wide. Sperm duct (Sd) clearly visible in ventral view. Median apophysis (Ma) slightly bent prolaterad. Membrane of median apophysis (Mm) well developed. Triangular membrane between embolus and median apophysis reduced. Conductor (Cn) originates at a 11 o’clock position. Embolus (Em) twice as long as median apophysis, with a thick base (Eb) and prolaterally curved apex.

Female unknown.

Distribution. Known only from the type locality in Ustyurt Plateau ( Fig. 44 ).

Figures

FIGURE 44. Collecting localities of Sidydrassus species. Triangle—S. saiynovi sp. n., circle—S. tianschanicus, square—S. shumakovi, diamond—S. rogue. Black symbols refer to the studied material, white symbols refer to the literature-derived data.

FIGURES 1–12. Habitus (1–6) and left chelicerae (7–12) of Sidydrassus saiynovi sp. n. (1, 7), S. tianschanicus (2, 8), S. shumakovi (3–4, 9–10) and S. rogue (5–6, 11–12). 1–3, 5—male, dorsal; 4, 6—female, dorsal; 7–9, 11—male, posterior; 10, 12—female, posterior. Scale bars: 1–6—2 mm, 7–12—0.2 mm.

FIGURES 13–18. Male palps of Sidydrassus saiynovi sp. n. (13–15) and S. tianschanicus (16–18). 13, 16—ventral; 14, 17—dorsal; 15, 18—retrolateral. Scale bars: 0.2 mm.

FIGURES 19–24. Bulbs of Sidydrassus saiynovi sp. n. (19–21) and S. tianschanicus (22–24). 19, 22—prolateral; 20, 23—ventral; 21, 24—retrolateral. Scale bars: 0.2 mm. Abbreviations: Cn conductor, Eb embolic base, Em embolus, Ma median apophysis, Mm membrane of the median apophysis, Sd sperm duct, Te tegulum, Tm triangular membrane.