Dolomedes senilis Simon, 1880

Fomichev, A. A., 2018, A new for Mongolia spider family Pisauridae Simon, 1890 (Arachnida: Aranei), Far Eastern Entomologist 371, pp. 28-32 : 29-31

Dolomedes senilis Simon, 1880

Figs. 1–4

Dolomedes senilis Simon, 1880b: 101 ; Song & Zheng, 1982c: 156, figs. 3-4; Hu, 1984: 258,

figs. 271.1-3; Guo, 1985: 132, figs. 2-69.1-3; Song, 1987: 205, fig. 165; Zhang, 1987:

166, figs. 140.1-2; Feng, 1990: 159, figs. 134.1-4; Song, Zhu & Chen, 1999: 347, figs.

202Q, 203J; Song et al., 2001: 266, figs. 166A-B; Zhang et al., 2004: 377, figs. 44-49;

Marusik & Kovblyuk, 2011: 219, figs. 31.8-9; Tanikawa, 2012: 11, figs. 1-2, 7-15; Yin et al., 2012: 879, figs. 440a-g.

Dolomedes strandi Bonnet, 1929a: 268 , figs. 1-3; Renner, 1988: 2, figs. 1a, 2-5; Marusik,

1988a: 1471, figs. 1.6-7.

MATERIAL. Mongolia: Bulgan Aimag, Egiyn-Gol River mouth (“Эгин-гол” in the original label) (Selenga River tributary), 1925, 2♀, leg. M.I. Tkachenko ( ZISP) .

DIAGNOSIS. Dolomedes senilis is similar to D. saganus Bösenberg et Strand, 1906 from

China and Japan, but its females can be separated by the rhomboid epigynal fovea with its posterior part not reaching the genital groove (vs inverse pear-shaped, reaching the genital groove in the related species) and by the copulatory ducts packed in a tight coil (vs copulatoty ducts packed in a loose coil in the related species). The male of D. senilis can be diagnosed by the short palpal tibia; the large fulcrum, with its top extending beyond the tip of the median apophysis (vs the palpal tibia long; the fulcrum small, with its top not extending beyond the median apophysis in D. saganus ) (Zhang et al., 2004).

DESCRIPTION. See the descriptions in Yin et al. (2012), Tanikawa (2012) and Zhang et al. (2004).

DISTRIBUTION. Dolomedes senilis is known from the southern part of the Russian Far

East, China (Beijing, Hebei, Hunan and Shaanxi Provinces) and Japan (Hokkaido Island)

(Bonnet, 1929; Yin et al., 2012; Tanikawa, 2012). The new record from Mongolia represents the northern-westernmost locality of the species range. D. senilis is the fourth Dolomedes species recorded from Siberia, to which the mountains of northern Mongolia indeed belong.

COMMENTS. In the photo depicting the female habitus of D. senilis from Japan, a white midline on the carapace and longitudinal light stripes on legs are clearly visible (Tanikawa,

2012: fig. 1). Such details of the coloration are absent from the specimens collected from

Mongolia ( Figs 1–2 ), the southern part of the Russian Far East (Bonnet, 1929: fig. 1) and

China (Yin et al., 2012: fig. 440a; Zhang et al., 2004: fig. 44). Such differences cold indicate that specimens from the continental Asia and from Japan are likely to belong to separate species.

TAXONOMICAL NOTES. Dolomedes senilis was described on the basis of the material collected from the vicinity of Beijing (Simon, 1880). In 1929, D. strandi Bonnet, 1929 was described from Amur River in the southern part of the Russian Far East. For 75 years, it had habitus, ventral view; 3 – macerated epigyne, dorsal view; 4 – intact epigyne, ventral view.

Scale bars: 1–2 = 2 mm; 3 = 0.2 mm; 4 = 0.5 mm.

been believed that these two were different species, until Zhang et al. (2004) reasoning from the descriptions and illustrations of D. strandi defined that the latter was to be considered a junior synonym of D. senilis .

Figures

Figs. 1–4. Female habitus and epigyne of Dolomedes senilis. 1 – habitus, dorsal view; 2 –