Sidydrassus rogue Tuneva, 2004

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 : 269-270

Sidydrassus rogue Tuneva, 2004

Figs 5–6, 11–12 , 31–36 , 40–41 , 44

S. rogue Tuneva, 2004: 326 , figs 17–21 (♂).

Material examined. MONGOLIA: Khovd Aimag: 1♂ ( ISEA, 001.8943), 46 km S from Altai Village, Bodonchyin-Gol River valley , 45°46’N, 92°10’E, cliff on the river bank, 1270 m, 07– 08.05.2012, A.A. Fomichev ; 1♀ ( ISEA, 001.8944), same locality, 45°45’N, 92°11’E, stony desert, 1300 m, 07– 08.05.2012, A.A. Fomichev .

Diagnosis. The male of S. rogue differs from all the congeners in having a strongly reduced RTA, which is 4 times shorter than tibia (vs. as long as tibia or twice shorter than tibia in other species) (cf. Figs 31–33 and 13–15, 16–18 , 25–27 ). The female of S. rogue is very similar to that of S. tianschanicus , but can easily be distinguished by epigynal proportions: viz., in S. rogue the epigynal fovea is 1.7 times longer than wide and the anterior receptacles (Ar) are significantly larger than the posterior ones (Pr) (vs. epigynal fovea is 2.1 times longer than wide and the anterior and posterior receptacles are equal in size in S. tianschanicus ) (cf. Figs 40–41 and 42–43 ).

Description. Male. Total length 8.0. Carapace: 3.4 long, 2.25 wide. Colouration. Carapace yellow-brown. Chelicerae and labium brown. Endites light brown. Sternum yellow-brown. Coxae yellow. Palps yellow-brown. Legs yellow. Mt–Ta of legs I–II light brown. Abdomen and spinnerets yellow-beige. Leg measurements: I: 3.05, 1.6, 2.8, 2.35, 1.65 (11.45). II: 2.75, 1.45, 2.3, 2.05, 1.5 (10.05). III: 2.55, 1.2, 1.95, 2.1, 1.4 (9.2). IV: 3.4, 1.4, 2.8, 3.4, 1.6 (12.6). Leg spination: I: Fe d1-0-1 p0-1-1; Ti v2-2-0; Mt v2-0-0. II: Fe d1-0-1 p0-1-1; Ti p0-0-1 v0-2-0; Mt v2-0-0. III: Fe d1-1-1 p0-1-1 r0-1-1; Ti d1-0-0 p1-1-1 r1-1-1 v1-2-2; Mt d0-2-0 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 31–36 . Tegulum (Te) 1.6 times longer than wide. Sperm duct (Sd) well visible in ventral view. Median apophysis (Ma) small, two times shorter than the embolus (Em). Membrane of median apophysis (Mm) and triangular membrane (Tm) well-developed. Conductor (Cn) originates at a 12:30 o’clock position. Embolic apex slightly bent prolaterad.

Female. Total length 7.8. Carapace: 3.5 long, 2.45 wide. Colouration. Carapace yellow-brown. Chelicerae and labium light brown. Endites and sternum yellow-brown. Coxae yellow. Legs and palps yellow, darker distally. Abdomen grey-beige. Spinnerets yellow. Leg measurements: I: 3.05, 1.55, 2.55, 2.15, 1.55 (10.85). II: 2.85, 1.45, 2.35, 2.1, 1.5 (10.25). III: 2.75, 1.25, 2.1, 2.2, 1.4 (9.7). IV: 3.65, 1.5, 3.1, 3.65, 1.65 (13.55). Leg spination: I: Fe d1-0-1 p0-0-1; Ti v1-2-0; Mt v2-0-0. II: Fe d1-1-0 p0-1-2; Ti p0-0-1 v0-2-0; Mt v2-0-0. III: Fe d1-1-1 p0-1-1 r0-1- 1; Ti d1-0-0 p1-1-1 r1-1-1 v1-2-2; Mt d0-2-0 p1-1-0 r1-1-0 v2-0-2. IV: Fe d1-1-1 p1-0-0 r0-1-1; Ti d1-0-1 p1-1-1 r2-0-1 v1-2-2; Mt d1-2-0 p1-1-0 r1-1-0 v2-0-2.

Epigyne as in Figs 40–41 . Fovea (Fo) cross-inclined, very wide, with thin lateral margins. Median plate (Mp) inverted triangle-shaped, almost smooth. Anterior receptacles (Ar) diverging, separated by 0.35 times of their diameter. Posterior receptacles (Pr) nearly rectangular, without pronounced heads.

Comments. The male of this species is well-described by Tuneva (2004). Here, I have also provided a description of the previously unknown female (see above).

Distribution. Previously, the species was known only from the type locality near Zaisan Lake in East Kazakhstan Oblast. The new record from western Mongolia represents the easternmost records of this species ( Fig. 44 ). It is likely that it occurs also in Xinjiang Province of China.

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 31–36. Male palp (31–33) and bulb (34–36) of Sidydrassus rogue. 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.

FIGURES 37–43. Epigynes of Sidydrassus shumakovi (37–39), S. rogue (40–41) and S. tianschanicus (42–43). 37—intact, ventral; 38, 40—macerated, ventral; 39, 41—macerated, dorsal; 42—ventral; 43—dorsal; 42–43—after Song et al. (2004). Scale bars: 0.2 mm. Abbreviations: Ar anterior receptacle, Cp copulatory opening, Fo fovea, Lm lateral margin of the fovea, Mp median plate, Pr posterior receptacle, Rh head of the posterior receptacle.

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 25–30. Male palp (25–27) and bulb (28–30) of Sidydrassus shumakovi. 25, 29—ventral; 26—dorsal; 27, 30—retrolateral; 28—prolateral. Scale bars: 0.2 mm. Abbreviations: Cn conductor, Eb embolic base, Em embolus, Lb prolateral branch of the median apophysis, Ma median apophysis, Mm membrane of the median apophysis, Sd sperm duct, Te tegulum, Tm triangular membrane.