Coelotinae

Okumura, Ken-ichi, Honki, Kazuyuki & Ohba, Shin-ya, 2019, Notes on Several Japanese Species of Iwogumoa and Coelotes (Araneae: Agelenidae: Coelotinae), Species Diversity 24, pp. 247-252 : 249-251

Subfamily Coelotinae F. O. P.-Cambridge, 1893 Iwogumoa songminjae (Paik and Yaginuma in Paik et al., 1969) [Japanese name: Kōrai-shimofuri-yachigumo] ( Fig. 1 )

Coelotes songminjae Paik and Yaginuma in Paik et al., 1969: 839–841, figs 65–69; Paik 1971: 377–380, figs 1–6; Paik 1978: 351–353, fig. 91; Marusik and Koponen 2000: 56; Namkung 2002: 368, fig. 28.

Coelotes tropidosatus Wang and Zhu, 1991: 4 , figs 9, 10; Song et al. 1999: 388, fig. 226.

Asiacoelotes songminjae: Wang 2002: 32 ; Kim and Lee 2006: 50–56, figs 1–4, 9.

Asiacoelotes tropidosatus: Wang 2002: 32 .

Iwogumoa songminjae: Zhu et al. 2017: 443 , fig. 294.

Material examined. Tsushima Islands , Nagasaki Prefecture, Japan . Mt . Mitake, 150 m alt., Kamiagata Town , 1 female (28 Decemebr 2009), 4 females (9 October 2011), Y . Ihara leg .; Shushi , Kamiagata Town , 2 females, 28 February 2009; Ni-i , Toyotama Town, 2 females, 27 December 2009; Shisyo forestry road, Nita Town, 3 females, 29 December 2009; Kamisaka, 380 m alt ., Izuhara Town , 3 females (29 December 2009), 1 male (30 December 2009), 2 males and 15 females (10 October 2010), 1 male and 2 females (6 October 2012), 1 male and 7 females (7 October 2012), 2 females (10 October 2015); Kashine, Izuhara Town, 1 female, 9 October 2011, Y . Ihara leg .; Mt. Sumo-shiratake, 250 m alt., Mitsushima Town , 1 male, 10 October 2010; Mt . Sumo-shiratake, 280 m alt., Mitsushima Town , 1 female, 30 December 2009; Kashi , Mitsushima Town, 1 female, 11 October 2015; Mikata, Mitsushima Town, 1 female, 11 October 2015 . The four specimens used for taking the photographs are deposited in NSMT (Ar-16979-16982).

Distribution. Korea, China, Russia and Japan (Tsushima Islands).

Diagnosis. Iwogumoa songminjae can be distinguished from I. insidiosa by the shape of the male palp and internal female genitalia (see results and discussion). Kim and Lee (2006) argued that there is a difference in the number of retromarginal teeth on the chelicerae of the two species, viz., female of I. insidiosa has three retromarginal teeth on the right chelicera, while the female of I. songminjae has four. However, we believe this is simply intra-specific variation: in the course of this study we observed differences in the number of teeth between the left and right chelicerae in individual specimens. This variation (normally three, rarely four) was also reported by Paik (1971). Moreover, Okumura (2009) demonstrated that variation in the number of retromarginal teeth occurs with high probability in species of Iwogumoa in comparison to other coelotine spiders (Okumura 2009).

Figures

Fig. 1. Comparison between Iwogumoa songminjae (Paik and Yaginuma in Paik et al., 1969) and Iwogumoa insidiosa (L. Koch, 1878): a, c, d, I. songminjae (NSMT-Ar 16979, 16980); b, d, f, I. insidiosa (NSMT-Ar 16981, 16982). a, b, ventral views of male palp; c, d, ventral views of epigyne; e, f, dorsal views of internal female genitalia. Abbreviations: BE, base of embolus; CL, conductor lamella; CO, conductor; FS, forefront of spermathecal stalk; TC, tip of cymbium.