Geothelphusa marginata fulva, Naruse & Shokita, 2004

Naruse, Tohru & Shokita, Shigemitsu, 2004, A New Species Of The Freshwater Crab, Previously Assigned To Geothelphusa Miyazakii (Miyake & Chiu, 1965) (Crustacea: Decapoda: Potamidae), From Yaeyama Group, Southern Ryukyus, Japan, Raffles Bulletin of Zoology 52 (2), pp. 555-562 : 560-562

Geothelphusa marginata fulva , new subspecies

Japanese name: Kasshoku-Sawagani ( Figs. 2c , 4 )

Geothelphusa miyazakii - Minei, 1973: 214 (part); 1981: 80 (part); Sakai, 1976: 562 (English text), 347 (Japanese text) (part); Hirata et al., 1988: 25 (part); Environment Agency, 1991: 228 (part); Okinawa Prefecture, 1996: 382 (part); Shokita, 1996: 348; Segawa, 2000: 243 (part); Kasai & Naruse, 2003: 283 (Part).

Geothelphusa sp. 2 - Yoshigou, 1999: 22, Pl. IIL (Part). Geothelphusa sp. 3 - Yoshigou, 1999: 22, Pl. 2N.

Material examined. – All specimens of G. m. fulva were collected in Iriomote Island, Southern Ryukyus, Japan.

Holotype – male, CL 30.7 mm, RUMF-ZC-62, upstream of Nakama River (near Nishifunatsuki, Ohtomi forest road) (type locality), coll. Tohru Naruse, 12 Aug.2001.

Paratypes – 2 males, CLs 18.2, 20.1 mm, 2 females, CLs 17.0, 30.0 mm, RUMF-ZC-88, data same as holotype ; 1 male, CL 22.8 mm, 1 female, CL 25.2 mm, NTOU F10220 , data same as holotype ; 1 male, CL 22.8 mm, 1 female, CL 24.0 mm, NSMT-Cr 15174, coll. Masayuki Osawa, Near Nadara Bridge, 4 Dec.2000; 1 male, CL 28.6 mm, NSMT-Cr 15175, Aira River , coll. Shigemitsu Shokita, Jul.2001 ; 1 female, CL 31.1 mm, CBM-ZC 4594, Near Kanpireh Waterfall , Urauchi River, coll. Tomoyuki Komai, 3 Jul.1998 ; 1 male, CL 23.3 mm, CBM-ZC 6725, Ohmija River , coll. Tohru Naruse, Mohamed Idha Salim, Yoshihisa Fujita and Akane Ito, 19 Mar.2001 .

Others – 4 males, CLs 17.7–25.0 mm, RUMF-ZC-63, upstream of Nishifunatsuki , Nakama River, coll. Tohru Naruse & Mohamed Idha Salim, 12 Mar.2001 ; 1 female, CL 31.3 mm, RUMF-ZC-64, Midara River , coll. Tohru Naruse & Mohamed Idha Salim, 14 Mar.2001 ; 3 males, CLs 15.7–22.2 mm, RUMF-ZC-65, Ohmija River , coll. Tohru Naruse, 16 Mar.2001 ; 2 males, CL 15.2, 21.5 mm, 1 female, CL 22.6 mm, RUMF-ZC-66, Cape Kasa-saki , coll. Tohru Naruse, 17 Mar.2001 ; 1 male, CL 20.9 mm, 2 females, CLs 17.0, 25.5 mm, RUMF-ZC-67, upstream of Nishifunatsuki , Nakama River, coll. Tohru Naruse, 3 Dec.1999 ; 1 female, CL 24.1 mm, RUMF-ZC-68, Shirahama forest road, coll. Tohru Naruse, 5 Aug.2001 ; 1 male, CL 15.2 mm, RUMF-ZC-69, Midara River , coll. Tohru Naruse, 6 Aug.2001 ; 1 male, CL 21.4 mm, RUMF-ZC-70, Urauchi River (near the confruence with Itajiki River), coll. Tohru Naruse, 12 Oct.1999 ; 1 female, CL 21.9 mm, RUMF-ZC-71, Urauchi River (near the confluence with Itajiki River), coll. Tohru Naruse, 13 Oct.1999 ; 1 female, CL 19.9 mm, RUMF-ZC-72, upstream of Nishifunatsuki , Nakama River, coll. Tohru Naruse, 30 Nov.1999 ; 1 male, CL 23.8 mm, RUMF-ZC-73, Urauchi River , coll. Chieko Matsumoto, 29 Apr.2002 ; 1 male, CL 19.3 mm, RUMF-ZC-74, Shirahama forest road, coll. Shinichi Watanabe & Nozomi Nakanishi, 25 Apr.2002 ; 2 males, CLs 14.8, 21.8 mm 2 females, CLs 19.8, 27.1 mm, ZRC 2003.0597 , a stream near Kanokawa Bay , coll. Tohru Naruse, 30 Dec.2001 ; 5 males, CLs 19.2–30.0, 2 females, CLs 18.3, 19.9 mm, ZLKU m1117, Urauchi River , coll. Shigemitsu Shokita, 2 May.1971 ; 1 female, CL 25.81 mm, HMNH-C81 , Urauchi River (near the confluence with Itajiki R.), coll. Hidenori Yoshigou, 17 Aug.2000 .

Diagnosis. – Carapace with convex anterolateral margin, frontal margin straight, cervical groove visible between Hshaped gastric region to hepatic region.

G1 sinuous to straight, subterminal segment with large knob on proximal outer margin, and proximal inner margin roundly swollen.

Carapace and ambulatory legs dark brown to yellowish brown, outer surface of chelae orange, brown, or reddish, and inner surface of manus and fingers white to yellow.

Distribution. – Iriomote Island, Yaeyama Group, Southern Ryukyus, Japan.

Etymology. – Geothelphusa marginata fulva is named after the Latin “fulvus” meaning “brown colour”, because of their colouration.

Remarks. – See “Remarks” of Geothelphusa marginata marginata .

Figures

Fig. 2. Colouration of Geothelphusa marginata marginata, G. m. fulva, and G. miyazakii.

Fig. 4. Geothelphusa marginata fulva. a, carapace, dorsal view; b, carapace, frontal view; c, gonopod 1, ventral view; d, gonopod 1, dorsal view; e, gonopod 2. All figures indicate holotype (RUMF-ZC-62). Scales: a, b, 10 mm; c–e, 1 mm.