Stylodactylus multidentatus multidentatus Kubo , 1942

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 : 30-32

Stylodactylus multidentatus multidentatus Kubo, 1942

( Fig. 3 B)

Stylodactylus multidentatus Kubo, 1942: 34 , figs. 4,5; Hayashi & Miyake, 1968: 586, fig. 1; Miyake, 1982: 26, pl.9, fig.

5 (colour photograph); Chace, 1983: 11 (key), 20, fig. 8a–o; Chan & Yu, 1985: 290, pl. I E, F (colour photographs);

Hayashi, 1986: 93, fig. 53 (colour photograph); Kensley et al., 1987: 293; Hayashi, 1991a: 43. Stylodactylus multidentatus multidentatus— Cleva, 1990a: 100, figs. 7, 8 h–m; 1994: 59; 1997: 391; 2004: 500. Stylodactylus discissipes— Balss, 1933: 84 (not Stylodactylus discissipes Bate, 1888 ).

Stylodactylus bimaxillaris— Miyake, 1982: pl. 9, fig. 4 (not Stylodactylus bimaxillaris Bate, 1888 ). Stylodactylus brevidactylus— Cleva, 1990a: 106, fig. 8 a–g.

Material examined. Philippines, Panglao I., stn. CP2381, 8°43.3’N – 123°19.0’E, 275–280 m, sandy substrate, 28 May 2005: 1 female 13.5 mm. – Stn. CP2409, 9°44.8’N – 123°44.8’E, 257–269 m, sandy/muddy substrate, 0 1 June 2005: 1 female 14.0 mm.

Remarks. The rostrum of the specimen from stn. CP2381 is broken; that of photographed specimen from CP2409 has 46 dorsal mobile spines (11 on the carapace proper), and 22 ventral spines. The RL/CL ratio is 1.05.

Colouration. Though this species is rather common, very few photographs of freshly caught animals have been published. The red stripes on the cephalothorax and abdomen and the red circular bands on the thoracic appendages seem to be typical. However, Chan & Yu (1985: 291) indicate that “Some specimens with paler colour and with red stripes not apparent. One male specimen without trace of red stripes on body.” Colouration has been described accurately by Chan & Yu (1985: 291) and Hayashi (1986: 93). Photographs of freshly caught specimens during the recent “SANTO 2006 Expedition” to Espiritu Santo I. ( Vanuatu) show specimens with variable colouration, the rostrum being translucent: one has the body almost completely pinkish; one ovigerous female has a pinkish body with orange patches on the anterodorsal portion of the carapace and on the dorsal and lateral portions of the abdomen; one male has a pinkish body but with the dorsal part of the carapace and the first two abdominal tergites red or reddish, the distal part of the translucent rostrum being reddish; one damaged female is more coloured, pink with small red dots, and the dorsal part of the carapace and first three abdominal tergites red and orange. None displays the large lateral red stripe on the abdomen.

Genetic analysis of DNA barcoding using mitochondrial cytochrome c oxidase gene (COI, 658 base pairs) on the two specimens of the present study and some specimens from Vanuatu, Fiji, Solomon Is., New Caledonia, Indonesia and Taiwan show that there are high genetic divergence in the material from various localities (Table 1). The two Panglao specimens have an identical sequences but the genetic divergence amongst the material of Vanuatu ranged from 0.2 to 2.4%. The specimens from Fiji, Solomon Is., New Caledonia and Indonesia have the COI sequences identical or almost identical (i.e. 0–0.9%) to some specimens from Vanuatu. However, material from Taiwan and the Philippines has high genetic divergence (2.6–3.6% and 3–4.6%, respectively) from other material as well as between themselves (4.7%). A comprehensive morphological (including coloration) and genetic comparisons of S. multidentatus material throughout its geographical range will be necessary to access the importance of colour variations as well as the taxonomic status of the subspecies in this species.

Distribution. The species is widespread across the western Pacific: Japan, 225–300m ( Kubo, 1942; Hayashi, 1986); Taiwan, 150–400m ( Chan & Yu, 1985; Cleva, 2004); Indonesia, 180–314m (Cleva, 1990, 1997; 146 m in Cleva, 1997 is a mistake); Australia, 237–412m ( Kensley & al., 1987; Cleva, 1994); New Caledonia, 205–580m (Cleva, 1990, 1997); Vanuatu, 314–830 m? ( Cleva, 1997); Fiji, 241–500 m ( Cleva, 2004); Tonga, 232–437 m ( Cleva, 2004); Solomon, 245–620 m ( Cleva, 2004). It has been collected in the Philippines between 152 and 366 m ( Chace, 1983; Cleva, 1990).

Figures

FIGURE 3. A, Stylodactylus gracilis new species, female 15.5 mm, holotype, PANGLAO 2005, stn. CP 2386; B, Stylodactylus multidentatus, female 14.0 mm, PANGLAO 2005, stn. CP 2409; C, Parastylodactylus bimaxillaris, ovigerous female 8.0 mm, PANGLAO 2005, stn. CP 2381; D, Parastylodactylus longidactylus, ovigerous female 5.9 mm, PANG- LAO 2005, stn. CP 2343; E, Bathypalaemonetes brevirostris, ovigerous female 9.9 mm, PANGLAO 2005, stn. CP 2343.