Segestria fengi, Fomichev & Marusik, 2020

Fomichev, Alexander A. & Marusik, Yuri M., 2020, Notes on the spider genus Segestria Latreille, 1804 (Araneae: Segestriidae) in the East Palaearctic with description of three new species, Zootaxa 4758 (2), pp. 330-346 : 337-341

Segestria fengi sp. n.

Figs 1 A–B, 2A, 3A, 4A, 6D–F, 7F, 8A, 9A–D, 10A, D, G, L, 12B.

Segestria bavarica: Xu 1987: 26 , f. A–D (♂).

Types. CHINA: Hebei Province: holotype ♂ ( IZCAS) and paratypes 9♂ 7♀ ( IZCAS & ZMMU) , Xiaowutai Mt. , 39°55’N, 115°E, 20.09.2005 ( YM) .

Etymology. The specific name is a patronym in honor of our friend and colleague Zhang Feng (Hebei University, Baoding, China) who organized a field trip for YM to the Xiaowutai Mt.

Diagnosis. This new species is similar to S. bavarica C.L. Koch, 1843 and S. nipponica Kishida, 1913 . From the former species it can be distinguished by the longer embolic part, not bifurcated tip of the embolus and a strongly shortened dorsal lobe of the anterior “receptacle” (cf. Figs 6 D–E, 7F and 6G, 7E). Males of S. fengi sp. n. differ from S. bavarica by the lack of basal spines on metatarsus I (3 basal spines in the sibling species). Both sexes can be distinguished from S. bavarica by the lack of a black longitudinal band on the venter of the abdomen. The new species differs from S. nipponica by the presence of 5 (in male) or 8 (in female) ventral spines on tibia I instead of 3. The new species also differs from S. nipponica by a relatively wider bulb (length/width ratio 2.17 vs. 2.63) and relatively shorter palpal segments in comparison to the bulb (cf. Figs 6 D–F and 6A–C).

Description. Male (holotype). Total length 5.7. Carapace: 2.4 long, 1.6 wide. Leg measurements as in Table 7. Coloration. Carapace and chelicerae brown. Maxillae yellow. Labium and sternum yellow brown. Palps yellow. Legs yellow with vague dark gray rings. Legs I and II darker than others. Abdomen gray-pink with black blots, dorsally bears a pattern formed by two rows of black square spots. Venter with two longitudinal black stripes. Spinnerets pale-yellow ( Figs 1 A–B, 2A). Leg spination as in Table 8.

Male palp ( Figs 6 D–F, 7F): femur as long as patella+tibia; bulb with globular tegular part and 1.7 times longer than femur; tip of embolus turned dorsally with almost right angle.

Female. Total length 7.4. Carapace: 2.75 long, 1.85 wide. Leg measurements as in Table 9. Coloration. Carapace, chelicerae and sternum like in male. Maxillae and labium light brown. Palps yellow-brown. Legs: Fe, Pt of leg I yellow, Ti–Ta brown; other legs yellow with vague gray rings. Leg II darker than legs III and IV. Abdomen beige mottled by dark gray specks, dorsally bears pattern formed of two rows of dark gray rectangular spots. Spinnerets pale yellow ( Figs 3A , 4A ). Leg spination as in Table 10.

Endogyne ( Figs 8A , 9 A–D, 10A, D, G, L): dorsal lobe of the anterior “receptacle” short and wide, not forming any loops; ventral lobe of the anterior “receptacle” irregular oval-shaped; posterior “receptacle” with rectangular anterior part and sparse glands on its walls; genital plate (Gp) strongly sclerotized.

Size variations. Males: body length 5.0–6.5, carapace 2.05–2.65 long and 1.45–1.8 wide (n=9). Females: body length 5.7–7.8, carapace 2.4–2.85 long and 1.6–1.9 wide (n=7).

Biology. All specimens have been collected from under the bark of pine trees.

Comments. Record of S. bavarica C. L. Koch, 1843 from the Qianshan of the Anhui Province of China ( Xu 1987) may refer to this species.

Distribution. Known with certainty from the type locality in the Hebei Province of China but may occur in the Anhui Province.

Figures

FIGURE 1. Habitus of the males of Segestria fengi sp. n. (A–B), S. shtoppelae sp. n. (C–D) and S. turkestanica (E–F). A, C, E, dorsal; B, D, F, ventral. Scale bars=1mm.

FIGURE 3. Dorsal habitus of the females of Segestria fengi sp. n. (A), S. shtoppelae sp. n. (B), Segestria sp. from India (C), S. turkestanica (D) and S. nekhaevae sp. n. (E). Scale bars: A, C=1 mm, B, D–E=2 mm.

FIGURE 4. Habitus of the females of Segestria fengi sp. n. (A), Segestria sp. from India (B, F), S. shtoppelae sp. n. (C), S. turkestanica (D) and S. nekhaevae sp. n. (E). A–E ventral; F lateral. Scale bars: A–C, E–F=1 mm, D=2 mm.

FIGURE 6. Male palp of Segestria nipponica (A–C), S. fengi sp. n. (D–F) and S. bavarica (G). A, C, D, F–G retrolateral; B, E prolateral. Scale bars: D–E=0.2 mm. G courtesy by Pierre Oger.

FIGURE 8. Endogyne of S. fengi sp. n. (A), S. shtoppelae sp. n. (B, D), S. nekhaevae sp. n. (C, F, I–J) and S. turkestanica (E, G–H). A, C, H, I, ventral; B, D–G, dorsal; J, lateral. Scale bars: B–C=0.2 mm. Abbreviations: Dl dorsal lobe of the anterior “receptacle”, Gp genital plate, Pg glands of the posterior “receptacle”, Pi pillar-shaped glands, Vl ventral lobe of the anterior “receptacle”.

FIGURE 9. Endogyne of S. fengi sp. n. (A–D), S. shtoppelae sp. n. (E, F–I), and S. turkestanica (J–L). A, G–K, ventral; B–C, F, dorsal. Scale bar: F=0.2 mm. Abbreviations: Ar anterior “receptacle”, Pi pillar-shaped glands, Pr posterior “receptacle”, Vl ventral lobe of the anterior “receptacle”.