Diogenes moosai Rahayu & Forest, 1995

Rahayu, Dwi Listyo, 2022, Hermit crabs of Singapore (Crustacea: Decapoda: Anomura: Diogenidae, Paguridae), with description of two new species, Raffles Bulletin of Zoology 70, pp. 329-363 : 345

Diogenes moosai Rahayu & Forest, 1995

( Fig. 8E )

Diogenes moosai Rahayu & Forest, 1995: 392 , fig. 2a, c–f, i (type locality: Muara Karang , Jakarta Bay, Indonesia); Rahayu, 2015: 183, figs. 2, 7B.

Material examined. 3 ovigerous females, 2.0– 2.2 mm ( ZRC 2021.0153 ), st. M24, Pulau Ketam, mud flat, 8 March 2012; 7 males , 2.5–3.5 mm, 1 ovigerous female, 2.3 mm ( MZB Cru 5205), st. DW36, Pulau Serangoon, 1°24.545′N 103°55.992′E, 16–18.6 m, 19 October 2012; 1 male , 2.9 mm ( ZRC 2021.0154 ), st. DW61, off Pulau Serangoon , 01°24.962′N 103°55.341′E, 7–11 m, 23 October 2012; 1 female , 2.0 mm ( ZRC 2021.0155 ), st. DR11-191, 01°24.046′N 103°39.574′E, 7.2–11.2 m, 27 June 2012; 1 male , 3.1 mm ( ZRC 2021.0156 ), st. SW110, Singapore Port Limit , 1°12′988 N 103°52′891 E, mangrove, 29 May 2013; 1 male , 2.4 mm ( ZRC 2021.0157 ), st. MF12, Kranji natural trail, 01°26.590′N 103°44.240′E, mud flat, 21 May 2011; 1 male , 3.8 mm ( ZRC 2021.0158 ), Singapore, 20 March 2014; 1 male , 1.1 mm ( ZRC 2021.0159 ), JS1275, st. DW40, 01°23.797′N 103°58.751′E, 15.6–21 m, 19 October 2012; 2 males , 1.6–1.8 mm ( ZRC 2021.0160 ), st. SW13, Chek Jawa, Pulau Ubin, mud flat, 16 October 2012 .

Distribution. Singapore, Indonesia; intertidal and subtidal to 21 m, on mud flat, and sandy, gravel substrates.

Remarks. Rahayu (2015) gave a short diagnosis and a description of the colouration in life on the basis of the material from Johor Strait. The specimens examined in this study are smaller than those examined by Rahayu (2015), however because of the following specific characters, the identification is justified: the possession of a long antennal acicle that is overreaching the base of the fourth antennal peduncular segment; the relatively small corneas; the convex outer surface of the palm of the left cheliped that is covered with spinulose tubercles and with a strong median ridge; and the presence of a longitudinal brown stripe on the dorsal surface of the ocular peduncle.

Figures

Fig. 8. A, Diogenes avarus Heller, 1852, not collected, IT86, Cyrene Reef, 1°15.374′N 103°44.816′E, 27 May 2013; B, Diogenes fasciatus Rahayu & Forest, 1995, male, 5.3 mm (ZRC 2021.0132); C, Diogenes klaasi Rahayu & Forest, 1995, male, not collected, Singapore Strait; D, Diogenes laevicarpus Rahayu, 1996, male, 5.1 mm (ZRC 2021.0139); E, Diogenes moosai Rahayu & Forest, 1995, male, 1.8 mm (ZRC 2021.0160); F, Diogenes rectimanus Miers, 1884, male, not collected, DW58, East of Pulau Tekong, 01°25.064′N 104°04.992′E, 10.9–11.3 m, 22 October 2012.