Sidydrassus Esyunin & Tuneva, 2002

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

Sidydrassus Esyunin & Tuneva, 2002

Type species: Drassus shumakovi Spassky, 1934 from Kalmykia ( Russia) .

Diagnosis. The genus is most similar to Drassodes Westring, 1851 in having straight and pointed RTA, oval tegulum with well visible sinusoidal sperm duct, thick and straight embolus and membranous conductor in males and dual receptacles in females. The males of Sidydrassus can be distinguished from those of Drassodes by the thick embolus and the large median apophysis (vs. filamentous embolus and small median apophysis in Drassodes ). The females of Sidydrassus differ from those of Drassodes in having cross-inclined epigynal fovea (vs. rounded in Drassodes ). The males of Sidydrassus are also similar to those of Talanites Simon, 1893 in having non filamentous embolus and large median apophysis, but can be separated from it by having long and straight RTA (vs. short and curved in Talanites ), medially situated embolus (vs. prolaterally situated embolus in the type species, T. fervidus Simon, 1893 ) and elongated distal part of the cymbium (vs. short and rounded in Talanites ).

Description. Total length: male 6.9–10.5, female 7.8–11.0. Carapace length: male 3.1–4.6, female 3.5–4.0; width: male 2.15–3.1; female 2.45–2.9. Carapace yellow-brown or light brown. Sternum yellow-brown to yellow. Chelicerae brown. Legs yellow to yellow-brown. Abdomen beige or cream-coloured. Spinnerets yellow or yellowbeige. Chelicera with three promarginal teeth ( Figs 7–12 ). Male palp. Femur 2–2.5 times longer than patella. Patella slightly shorter than tibia. Retrolateral tibial apophysis as long as tibia or 2–4 times shorter. Cymbium drop-shaped, longer than tibia. Tibia and cymbium bear several strong spines. Tegulum 1.5–1.8 times longer than wide. Sperm duct C-shaped or sinusoidal. Median apophysis well-developed. Conductor membranous, translucent. Embolic base thick. Embolus short, with a slightly curved tip. Epigyne. Fovea cross-inclined, slit-shaped or wide and round. Median plate in form of an inverted triangle or pentagonal. Receptacles dual: the anterior one spherical, the posterior one flattened.

Composition. Sidydrassus rogue , S. saiynovi sp. n., S. shumakovi and S. tianschanicus .

Distribution. The southern part of Russian Plain, the Caucasus, Iran and Central Asia.

Figures

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.