Stylodactylus tokarensis Zarenkov, 1968

Cleva, Régis, 2004, Stylodactylidae And Bathypalaemonellidae From Taiwan (Crustacea: Decapoda: Caridea), Raffles Bulletin of Zoology 52 (2), pp. 497-511 : 504-505

Stylodactylus tokarensis Zarenkov, 1968

( Figs. 2b , 6 d )

Stylodactylus tokarensis Zarenkov, 1968: 58 (pro parte), Fig. 2 ( Fig. 2 : third pereiopod, and Fig. 3 correspond to Stylodactylus licinus Chace, 1983 ); Cleva, 1990: 91, Figs. 3 k-p, 4, 5; Hayashi, 1991b: 120; Cleva, 1997: 391.

Material examined. – 1 male 8.5 mm ( NTOU), “ TAIWAN 2001”, commercial trawler, st. CP115, 24 53.87’N- 122 02.05’E, 381-440 m, 21 May.2001 ; 1 male 9.5 mm ( NTOU),“ TAIWAN 2002”, st. CD 192, 22 17.19’N- 120 1.01’E, 960-1302 m, 28 Aug.2002 ; 1 male, damaged ( NTOU), “ TAIWAN 2003”, st.CD 210, 24 28.99’ N-122 12.79’E, 500-1183 m, 01 Jun.2003 .

Comparative material. – 1 female 10 mm (MNHNNa.15006), Fidji Islands, “Alis”, MUSORSTOM 10, coll. Bouchet & Richer de Forges , st. CP 1330, 17 09,5’ E-177 56.3’E, 567-699 m, 08 Aug.1998 ; 1 female 7.5 mm, Salomon Islands , “Alis”, SALOMON 1, coll. Bouchet et al., st. CP 1795, 9 18.8’S- 160 22.9’E, 442-451 m, 01 Oct.2001 .

Remarks. – In the specimen from st. CP 115, rostrum/ carapace ratio (=1), as well as number of rostral spines (30 dorsal, of which seven post orbital, and eight ventral) and their arrangement, appearing to be very close to that of the holotype (see Cleva 1990: 92, Fig. 4 ). The short, stout dactyls of the last three pairs of pereiopods are other characteristic features of this species.

The specimen from st. CD 192 probably belongs to this species, but some doubt remains due to its poor condition (rostrum and telson broken, many appendages missing, body more reddish and pereiopods without bands). Identification of the specimen from CD 210, damaged and without rostrum remains also uncertain.

Coloration. – Body generally yellowish-orange. Pereiopods and telson slightly banded with orange and white ( Fig. 6d ).

Distribution. – Stylodactylus tokarensis is known from East China Sea (holotype, 820 m depth), Indonesia (285-595 m), New Caledonia (485-850 m) and the Chesterfield Islands (500-570 m). It has recently been collected in the Fidji Islands (567-699 m) and the Solomon Islands (442-451 m) by the French cruises MUSORSTOM 10 and SALOMON 1. This is the first record for Taiwan, where the species was caught between 381-440 m (or even more, see above under “Material examined” and “Remarks”).

Figures

Fig. 2. (a), Stylodactylus libratus Chace, 1983, male 11 mm, Su-Aou fishing Port; (b), Stylodactylus tokarensis Zarenkov, 1968, male 8.5 mm, TAIWAN 2001, st. CP 115. Scale bars= 5 mm.

Fig. 6. (a) Stylodactylus major Hayashi & Miyake, 1968, male 37 mm, TAIWAN 2001, st. CD136; (b) Stylodactylus libratus Chace, 1983, male 11 mm, Su-Aou fishing Port; (c) Stylodactylus licinus Chace, 1983, female ov. 16 mm, TAIWAN 2001, st. CD132; (d) Stylodactylus tokarensis Zarenkov,1968, male 8.5 mm, TAIWAN 2001, st. CP115; (e) Bathypalaemonella hayashii Komai, 1995, female 12.5 mm, TAIWAN 2001, st. CP139; (f) Bathypalaemonetes brevirostris (Bruce, 1986), 8.5 mm, TAIWAN 2000, st. CP58; (g) Bathypalaemonetes pilosipes (Bruce, 1986), female 10.5 mm, TAIWAN 2001, st. CD139; (h) Bathypalaemonetes chani, new species, female ov.15 mm, holotype, TAIWAN 2001, st. CD132.

Fig. 3. (a),(d), Stylodactylus sp. aff. pubescens Burukovsky, 1990, female ov. 12.5 mm,“TAIWAN 2003”, st. CD 210: (a), anterior part of cephalothorax; (d), right third pereiopod; (b),(c), Stylodactylus pubescens Burukovsky, 1990: (b), male 11.5 mm, Paratype, anterior part of cephalothorax; (c), female 10.5 mm, Paratype, anterior part of cephalothorax. Scale bars = 5 mm.

Fig. 4. Bathypalaemonetes chani, new species, female ov. 15 mm, Holotype, TAIWAN 2001, st. CD 132. Scale bar = 5 mm.