Hayashidonus japonicus ( De Haan, 1844)

Grave, Sammy De & Anker, Arthur, 2013, New records of processid shrimps from the Indo-West and East Pacific (Crustacea: Decapoda), Zootaxa 3640 (2), pp. 224-241 : 228-229

Hayashidonus japonicus ( De Haan, 1844)

Nika japonica De Haan, 1844 [in De Haan, 1833–1850]: pl. 46, fig. 6.

Processa japonica .— De Man, 1920: 208; pl. 18, fig. 53.– Hayashi, 1975: 110, fig. 24.—Noël, 1986: 287. Hayashidonus japonicus .—Chace, 1997: 35, fig. 18.—Kim et al., 2011: 262, fig. 1.

Material examined. Republic of Palau: 1 female (pocl 7.4), OUMNH.ZC.2012-01-075, Palau, outside of Malakal Harbour, 7.27065 134.46523, 55m, light trap, leg. S. De Grave & C. Burras, 31.05.2002 [st 288].

Colour pattern. Not recorded.

Remarks. The single specimen presents no noteworthy features and corresponds closely to the descriptions in De Man (1920) and Hayashi (1975), with the broadly triangular rostrum being highly characteristic for the species.

Ecology. Ledoyer (1984) and Unsworth et al. (2010) found H. japonicus to be particularly abundant in nocturnal seagrass bed samples in New Caledonia and Sulawesi, respectively. However, the depth range of the species (0–150 m) indicates that it is not exclusively associated with seagrass beds.

Distribution. This species is widely distributed in the Indo-Pacific, from East Africa through Indonesia and the Philippines to Japan (Hayashi 1975; Noël 1986; Chace 1997) and Korea (Kim et al. 2011), and has been recorded from almost intertidal depths down to 150 m (Noël 1986). The present new record from Palau constitutes the eastern-most record for the species.