Dichodactylus tarumii ( Arita, 1976 ) Okumura, 2017

Okumura, Ken-ichi, 2017, Dichodactylus gen. nov. (Araneae: Agelenidae: Coelotinae) from Japan, Species Diversity 22 (1), pp. 29-36 : 31-34

Dichodactylus tarumii ( Arita, 1976) comb. nov.

( Figs 1 A–D, 3A–D, 5B, E, 6)

Coelotes tarumii Arita, 1976: 201 , figs 16–22; Yaginuma 1986: 151, fig. 81.2; Okumura et al. 2009: 184, figs 2-2-33- 131–2-2-33-133.

Type material. Although Arita (1976) stated “the holotypes and part of the paratypes of the new species are preserved in the collection of the Arachnological Society of East Asia, Ohtemon-Gakuin University, Ibaraki, Osaka; the remainder of the paratypes are deposited in the collection of the Tottori Prefectural Museum , Tottori ”, none of the type material for this species could be located . Therefore I have not been able to examine the type specimens. However, this species is possible to identify in an original description, and I examined the specimens collected from Tottori Pref . which is near to the type locality. Further intensive survey should be done to make the presence or absence of type specimens clear in this species.

Type locality. Mt. Daisen, Tottori Prefecture, Japan ( Arita 1976) .

Material examined. All specimens collected by (and in the collection of) the author unless otherwise indicated. JAPAN. Honshu: Shiga Prefecture: Gongen-dani , 260–270 m alt ., Kawachi, Taga Town , Inukami County, 3 females, 9 . X . 2005, Y . Ihara leg .; Umehara , 330–340 m alt ., Imazu Town, Takashima City , 1 female, 24 . X . 2009, Y . Ihara leg . Osaka Prefecture: Mt . Shiroyama, 850 m alt., Izumi, Kishiwada City , 1 male, 28 . III. 1997, N . Tsurusaki leg . Tottori Prefecture: Mikuma Shrine , 100 m alt ., Mikuma, Tottori City , 1 female, 13 . I . 2012, Y . Ihara leg .; Kuritani, Fukube Town, Tottori City , 1 male and 1 female, 18 . I . 2012, Y . Ihara leg .; Kasegi, Saji Town, Tottori City , 1 female, 14 . X . 1990, K . Nojima leg .; Kitamura, Kawara Town, Tottori City , 2 females, 14 . X . 1990, K . Nojima leg . Yamaguchi Prefecture: Kawakamitōtani, Hagi City , 1 female, 14 . XI . 2006, Y . Ihara leg .; Mt. Monju, 270 m alt., Nishimigama, Suō-ōshima Town , Ōshima County, 1 male, 22 . XI . 2008, Y . Ihara leg . Kyushu : Fukuoka Prefecture: Mt . Tachibana, Fukuoka City , 1 male and 4 females, 3 . XI . 2006; Sugao Falls , 230 m alt ., Kokuraminami Ward, Kita-kyushu City , 1 female, 24 . XI . 2012; No Pass , 730 m alt ., Miyako Town, Kyoto County , 1 female, 3 . V. 2006; Mt. Hiko, 820 m alt., 1 female, 5. V . 2006 ; Chikuhō Town , 440 m alt., Kaho County, 2 males and 1 female, 4 . XI . 2006. Saga Prefecture: Mt . Kinzan, 650 m alt., Mitsuse Village, Saga City , 1 male and 2 females, 5 . XI . 2006; Mt. Kusenbu, 820 m alt., Tosu City , 1 female, 1 . I . 2007; Kokura , 205 m alt ., Kiyama Town , Miyaki County, 2 females, 27 . XI . 2011. Nagasaki Prefecture: Shimabara City , 1 male, 25 . X . 1985, C . Tanabe leg .; Mt. Yasuman, 470 m alt., 1 male (7. I. 2006), 1 female (2. XII. 2006), 1 male and 1 female (18. X. 2014); Kumamoto Prefecture: Kukino, Minami-aso Village , Aso County, 1 female (9. I. 1990), Y . Ihara leg ., 1 female (17. II. 1990), Y . Ihara leg . Ōita Prefecture: ōta, Kusu Town , Kusu County, 1 female, 3 . V. 2006; Mt. Mae, 730 m alt., Yufu City , 5 females, 4 . V. 2006; Mt. Tsurumi, 1340 m alt., Beppu City , 1 female, 18 . IX . 2006; Mt. Shiritsuki, 500 m alt., Bungo-takada City , 1 female, 26 . III. 2010. Two samples are deposited in NSMT (NSMT-Ar 14732, 14733) .

Diagnosis. Male with tip of spatulate conductor extending retrolaterally. Female with pair of small, posteriorly-located epigynal teeth; copulatory ducts hidden in dorsal view of cleared epigynum.

Description of male (NSMT-Ar 14732). Palp ( Figs 3A, B , 5B ): two small patellar apophyses present; LTA reduced; RTA large and elongated; cymbial furrow short, one-seventh of the cymbial length; median apophysis semicircular; conductor spatulate, resembles that of the genus Tegecoelotes .

Description of female (NSMT-Ar 14733). Epigynum and internal genitalia ( Figs 3C, D , 5E ): epigynum hourglassshaped; epigynal teeth nipple-shaped, situated posteriorly on epigynum; spermathecae elongated anteroposteriorly, convoluted and close to each other; spermathecal heads situated anterolateral portion of spermathecae.

Distribution. Western Japan ( Fig. 6 ).

Figures

Fig. 1. Comparison between the genera Dichodactylus gen. nov. and Orumcekia Koçak and Kemal, 2008: A–D, D. tarumii (Arita, 1974), male (A, B: NSMT-Ar 14732), and female (C, D: NSMT-Ar 14733); E–H, O. gemata (Wang, 1994), male (E, F: NSMT-Ar 14737), and female (G, H: NSMT-Ar 14736). A, E, ventral views of male palp; B, F, retrolateral views of male palp; C, G, ventral views of epigynum; D, H, dorsal views of internal female genitalia. Abbreviations: CON, conductor; CVA, conductor ventral apophysis; MA, median apophysis; PA, patellar apophyses; PEM, posterolaterally expanded margin; RTA, retrolateral tibial apophysis; SP, spermatheca.

Fig. 3. Dichodactylus tarumii (Arita, 1976). male (A, B: NSMT-Ar 14732), female (C, D: NSMT-Ar 14733). A, ventral view of male palp; B, retrolateral view of male palp; C, ventral view of epigynum; D, dorsal view of internal female genitalia. Abbreviations: CO, conductor; CY, cymbial furrow; EM, embolus; ET, epigynal teeth; MA, median apophysis; PA, patellar apophyses; RTA, retrolateral tibial apophysis; SP, spermatheca; SH, spermathecal head. Scale bars: 0.5mm.

Fig. 5. Comparison of genitalic characters of three species of Dichodactylus gen. nov. from Japan: A, D, D. shinshuensis sp. nov., male (A: NSMT-Ar 13339), and female (D: NSMT-Ar 13341); B, E, D. tarumii (Arita, 1976), male (B: NSMT-Ar 14732), and female (E: NSMT-Ar 14733); C, F, D. satoi (Nishikawa, 2003), male (C: NSMT-Ar 14735), and female (F: NSMT-Ar 14734). A–C, retrolateral views of male palp; D–F, ventral views of epigynum. Abbreviations: CO, conductor; ET, epigynal teeth; LAM, lamellas; PA, patellar apophyses; SW, swollen portion of tegulum. Black circle on tibia shows the vestigial LTA.

Fig. 6. Distribution of three species of the genus Dichodactylus gen. nov. from Japan. Closed circles denote D. shinshuensis sp. nov.; closed inverted triangles, D. tarumii (Arita, 1976); crosses, D. satoi (Nishikawa, 2003).