Xysticus tenuiapicalis sp. nov. (Araneae: Thomisidae) is described based on males from Central Anatolian Region in Turkey.
Thomisidae, commonly called crab spiders, is a big spider family comprising 177 genera and 2,146 species worldwide, of which 82 species of 14 genera are known in Turkey. The largest genus of this family, Xysticus C. L. Koch, 1835 currently contains 359 species and is distributed throughout the world. Among them, 45 species are known to Turkish fauna (Demir 2008; Demir et al. 2006, 2008a–c, 2009a, b, 2010a, b; Logunov 2006; Logunov & Demir 2006; Topçu & Demir 2004; Topçu et al. 2005; Platnick 2011). In the present study, a new species from Turkey is described.
MATERIALS AND METHODS
Most of the specimens were collected in Central Anatolian Region of Turkey by pit-fall trapping and hand collecting. All illustrations were made with a Nikon SMZ-U stereomicroscope with drawing tube. All measurements are in millimeters. Abbreviations used in the text and in the figure are as follows: ALE, anterior lateral eyes; AME, anterior median eyes; ap, apical; d, dorsal; MOA, median ocular area; MOA-L, length of MOA; MOA-WA, anterior width of MOA; MOA-WP, posterior width of MOA; PLE, posterior lateral eyes; PME, posterior median eyes; VTA, ventral tibial apophysis; pr, prolateral; rt, retrolateral; v, ventral; NUAM, Arachnology Museum of the Niğde University, Niğde, Turkey. Terminology of genitalia and system of leg spination follow Ono (1988).
XYSTICUS TENUIAPICALIS SP. NOV.
Type Material
Holotype. One male, (NUAM), TURKEY: Nevşeshir, Derinkuyu, Til village, 20 March 2005, leg. H. Demir. Paratypes: 1 male, (NUAM), Ankara, Kızılcahamam, 13 June 2003, leg. H. Demir; 1 male, (NUAM), Aksaray, Ihlara valley, 19 March 2005, leg. O. Seyyar.
Description
Measurements of Holotype. Carapace: 1.95 long, 1.92 wide. Abdomen: 2.02 long, 1.70 wide. Clypeus 0.25 long, chelicera 0.65 long. Eye sizes and inter distances: AME 0.12, ALE 0.15, PME 0.10, PLE 0.16; MOA-WA 0.75, MOA-WP 0.90, MOA-L 0.45, AME-AME 0.32, AME-ALE 0.16, PME-PME 0.30, PME-PLE 0.15. Lengths of legs [total length (femur+patella+tibia+metatarsus+tarsus)]: I 6.30 (2.00+0.80+1.35+1.25+0.90), II 6.10 (2.00+0.75+1.25+1.20+0.90), III 3.65 (1.25+0.50+0.75+0.55+0.60), IV 3.85 (1.25+0.40+0.85+0.75+0.60).
Male. Carapace dark red-brown with V-shaped yellow median band. Ocular area yellow. Sternum yellow with red-brown spots. Labium and maxillae light brown. Chelicerae dark red-brown with yellowish dots. Femora, patellae and proximal parts of tibia I and II dark red-brown, other parts yellow. Femora and patellae III and IV light brown, tibiae, metatarsi and tarsi yellow. Dorsum of abdomen light brown with white stripes on sides and anteriorly, venter of abdomen grey brown. Spinnerets and branchial opercula light brown. Leg I spination: femur d. 1-1-2-1, p. 1-2-22-1, tibia v. 2-1-2-2-2ap., metatarsus p. 2-2-2-2ap., v. 1-2-2-2ap.
Palpus. Bulb much longer than wide, with 2 tegular apophyses; the median one uncinate, the apical one thorn-like shaped. Embolus long, thick and filiform, winding around tegulum and tutaculum. Tutaculum long. Tibia with ventral and retrolateral apophyses: the retrolateral apophysis obtuse; the ventral apophysis as in Figs. 1A, B.
Fig. 1.
Xysticus tenuiapicalis sp. nov. (A, B) left male palp; (A) ventral view; (B) retrolateral view. Scale bar: 0.1 mm.
Female. Unknown.
Diagnosis
Xysticus tenuiapicalis sp. nov. is closely related to X. lanio C. L. Koch, 1835, X. pseudolanio Wunderlich, 1995, X. ukrainicus Utotchkin, 1968 and X. slovacus Svaton, Pekar & Pridavka, 2000. The males of X. tenuiapicalis sp. nov. can be distinguished easily from X. lanio (cf. Esyunin & Efimik 1995: Figs. 12–13; Utotchkin 1968: Figs. 66– 67), X. slovacus Svaton, Pekar & Pridavka, 2000 (cf. Esyunin & Efimik 1995: Figs. 16–17; Svaton et al. 2000: Figs. 3, 5–6) and X. ukrainicus Utotchkin, 1968 (Utotchkin 1968: Figs. 70–71) by the shape of the tegular and ventral tibial apophyses. From X. pseudolanio (cf. Wunderlich 1995: Figs. 34–35) males can be distinguished by tiny apical tegular apophysis, as well as by the shape of both the tutaculum and tegular apophysis.
