Sibirocosa koponeni, Omelko, Mikhail M. & Marusik, Yuri M., 2013

Omelko, Mikhail M. & Marusik, Yuri M., 2013, A survey of East Palaearctic Lycosidae (Araneae). 9. A review of Sibirocosa with a description of three new species, Zootaxa 3666 (3), pp. 319-330 : 320-322

Sibirocosa koponeni sp. n.

Figs 1–7 , 10 , 16, 22 , 28, 34 , 45–47 , 61–62

Types. Holotype 3 and paratypes 113 4Ƥ (ZMMU) from Russia, Maritime Province, Krasnoarmeisk District, Ozernoe Plateau, 45°51'05.32"N, 136°39'35.20"E, 1505 m, scree, 21.06.2011 (M.M. Omelko).

Etymology. The specific name is patronym in honor of our friend and colleague, Seppo Koponen, a wellknown Finnish arachnologist who has made important contributions to the taxonomy of Holarctic Lycosidae .

Diagnosis. Males of Sibirocosa koponeni sp. n. are most similar to S. kolymensis , S. sibirica (Kulczyński, 1908) and S. subsolana . It differs from S. kolymensis by the noticeably curved embolus (lacking in S. kolymensis ) and smaller paleal apophysis. The new species can be distinguished with certainty from S. sibirica by the less massive conductor. Finally, S. koponeni sp. n. differs from S. subsolana by the bent external margin of the conductor. Females of the new species are most similar to S. sibirica in the more or less rounded shape of the fovea, but is easily distinguished by the course of the receptacles that turn anteriorly in S. sibirica and posteriorly in S. koponeni sp. n.

Comments. Sibirocosa koponeni sp. n. resembles S. manchurica , which also occurs in the Maritime Province, in its body colouration and habitat preferences. Nevertheless, the structure of the copulatory organs of this new species more closely resemble those of northern species of Sibirocosa , especially the type species of the genus, S. kolymensis .

Description. Male. Total length 5.95–6.00, carapace 3.10–3.35 long, 2.50–2.55 wide. Carapace dark brown without evident pattern. Leg segments brownish with annulations except for yellow tarsus, metatarsus and patella of leg I. Femur I with 3 dorsal, 2 pro- and 2 retrolateral spines; patella with 2 dorsal, 1 pro- and 1 retrolateral spines; tibia with 2 dorsal, 1 pro-, 1 retrolateral and 5 pairs of ventral spines; metatarsus with 2 pro-, 2 retrolateral and 2 pairs of ventral spines. Leg I segments length (small and (large specimen)): 2.65(2.75) +1.20(1.25) +2.50(2.65) +2.70 +1.40(1.45). Abdomen blackish with brown heart mark and 5 pairs of white spots on dorsal surface.

Palp as in Figs 2–7 , 10 , 16, 22 , 28, 34 . Cymbium dark brown with yellow apical third; tip of cymbium with two claws; tegular apophysis flattened in its upper part; palea (Pa) heavily sclerotised; conductor (Co) heavily built, with turned external margin; terminal apophysis small, sharply pointed; embolus (Em) wide and noticeably bent.

Female. Total length 7.00–7.45, carapace 3.00–3.20 long, 2.25–2.40 wide. Carapace dark brown with indistinct light spots near the margin. All leg segments brownish with annulations. Femur I with 3 dorsal, 2 pro- and 2 retrolateral spines; patella with 1 dorsal, 1 prolateral spines; tibia with 1 dorsal, 1 pro-, 1 retrolateral and 5 pairs of ventral spines; metatarsus with 2 pro-, 2 retrolateral and 2 pairs of ventral spines. Leg I segments length (small and (large specimen)): 2.30 (2.70) +1.05 (1.20) +2.05 (2.40) +1.80 (2.05) + 1.05. Abdomen colouration as in male.

Epigyne as in Figs 45–47 . Fovea (Fo) very deep, rectangular, with rounded corners; width/height ratio 1.31– 1.59; septum variable: from well to poor developed; receptacles (Re) short, lying between the epigynal plate and fovea floor (Ff).

Distribution. Type locality only ( Fig. 64 ).

Biology notes. Sibirocosa koponeni sp. n. only inhabits screes in the alpine belt on the eastern part of the Ozernoye plateau. Both adult males and females were found in the second half of June.

Figures

FIGURE 64. Distribution of Siberia and Far Eastern species of Sibirocosa: S. kolymensis (), S. koponeni sp. n. (), S. manchurica (), S. nadolnyi sp. n. (), S. sibirica (), S. subsolana () and S. trilikauskasi sp. n. ().

FIGURES 1 – 7. Male of Sibirocosa koponeni sp. n. 1 — general appearance, dorsal; 2 – 3 — terminal part of palp, ventral and retrolateral; 4 — whole palp, retrolateral; 5 – 6 — tegulum and tegular apophysis, terminal and ventral; 7 — bulbus, ventral. Scale = 0.2 mm if not otherwise indicated.

FIGURES 8 – 14. Male palps of Sibirocosa species. Sibirocosa subsolana (8), S. manchurica (9), S. koponeni sp. n. (10), S. trilikauskasi sp. n. (11 – 13) and S. nadolnyi sp. n. (14). 8 – 10, 13 – 14 — ventral; 11 – 12 — tegulum and tegular apophysis, anterior and ventral. Scale = 0.2 mm.

FIGURES 15 – 26. Embolic division of Sibirocosa species. Sibirocosa kolymensis (15, 21), S. koponeni sp. n. (16, 22), S. manchurica (17, 23), S. sibirica (18, 24), S. subsolana (19, 25) and S. trilikauskasi sp. n. (20, 26). 15 – 20 — ventral; 21 – 26 — anterior. 15, 18, 21, 24 after Marusik et al. (2004). Scale = 0.2 mm. Abbreviations: Co conductor, Em embolus, Pa palea, Ta terminal apophysis.

FIGURES 27 – 38. Embolic division of Sibirocosa species. Sibirocosa kolymensis (27, 33), S. koponeni sp. n. (28, 34), S. manchurica (29, 35), S. sibirica (30, 36), S. subsolana (31, 37) and S. trilikauskasi sp. n. (32, 38). 27 – 32 — retrolateral; 33 – 38 — posterior. 27, 30, 33, 36 after Marusik et al. (2004). Scale = 0.2 mm. Abbreviations: Co conductor, Em embolus, Pa palea, Ta terminal apophysis.

FIGURES 45 – 59. Epigynes of Sibirocosa species. Sibirocosa koponeni sp. n. (45 – 47), S. kolymensis (48 – 49), S. manchurica (50 – 51), S. subsolana (52 – 54), S. sibirica (55 – 56) and S. trilikauskasi (57 – 59). 45 – 46, 48, 50, 52, 55, 57 – 58 — ventral; 47, 49, 51, 54, 56, 59 — dorsal. 49, 51, 56 after Marusik et al. (2004). Scale = 0.2 mm. Abbreviations: Ap apical pocket, Ff floor of fovea, Fo fovea, Re receptacle.

FIGURES 60 – 63. Photographs of Sibirocosa specimens and habitat. Male of Sibirocosa koponeni sp. n. (60, 61), female of S. manchurica (62), type locality of S. manchurica and typical habitat of Sibirocosa (63).