Bathypalaemonella aff. hayashii Komai, 1995

Cleva, Régis, 2008, Stylodactylidae and Bathypalaemonellidae (Crustacea: Decapoda: Caridea) from the PANGLAO 2004 and 2005 expeditions to the Philippines, with description of a new species of Stylodactylus A. Milne - Edwards, 1881, Zootaxa 1813, pp. 29-41 : 37-39

Bathypalaemonella aff. hayashii Komai, 1995

( Fig. 2 B)

Bathypalaemonella hayashii Komai, 1995: 40 , figs. 1–4; Cleva, 2001: 763, figs. 2A-D, 3, 10B; 2004: 506, fig. 6e.

Material examined. Philippines, Panglao I., stn. CP2362, 8°56.5’N – 123°32.7’E, 679–684 m, sandy substrate, 26 May 2005: 1 male 9.5 mm.

Remarks. This specimen is incomplete and damaged: large P2, left P4 and P5, and posterior part of abdomen and telson are missing. Therefore, positive identification is difficult. Nevertheless, the specimen shows following features: rostrum with 12 dorsal (three on the carapace proper), plus a small fixed subterminal tooth, and three ventral spines; RL/CL ratio 0.82; length of P1 chela/ CL ratio: 0.25; P1 carpus/ P1 chela ratio: 1.6; dactyls of right P3–P5 with three pairs of spinules, dactyl of left P3 with three and four spinules; carpus of P3–P5 much shorter than propodus.

These characters allow to tentatively identify the specimen with Bathypalaemonella hayashii rather than to the closely allied B. serratipalma : B. serratipalma has a stronger and longer P1 (ratio length of P1 chela/ CL: 0.30–0.35 versus 0.24–0.30 in B. hayashii ), with shorter carpus (P1 carpus/ P1 chela ratio 1.2–1.5 versus 1.6–1.9 in B. hayashii ), and the P3–P5 are longer and with different ratio between articles (the carpus being very long, quite as long as the propodus or only slightly shorter) ( Cleva 2001: 760–766).

Colouration. Body pink with reddish small dots; rostrum and second antenna red; antenna withish; pereopods pinkish/reddish. Photographs given by Cleva (2001, fig. 10B; 2004, fig. 6e) show that this colouration fits better with B. hayashii than with B. serratipalma , where the rostrum appears translucent.

Distribution. B. hayashii is known from Japan (311–815 m), Indonesia (439–605 m), New Caledonia (700 m) and Vanuatu (492–520 m) ( Cleva 2001: 764). This is the first Philippines record, if the present identification is correct.

Figures

FIGURE 2. A, Parastylodactylus longidactylus, ovigerous female 5.9 mm, PANGLAO 2005, stn. CP 2343, anterior portion of cephalothorax, lateral view; B, Bathypalaemonella aff. hayashii, male 9.5 mm, PANGLAO 2005, stn. CP 2362, anterior portion of cephalothorax, lateral view; C, Bathypalaemonetes brevirostris, ovigerous female 9.9 mm, PANG- LAO 2005, stn. CP 2343, anterior portion of carapace, lateral view.