Diogenes klaasi 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 : 343-344

Diogenes klaasi Rahayu & Forest, 1995

( Fig. 8C )

Diogenes klaasi Rahayu & Forest, 1995: 395 , fig. 3 (type locality: Balikpapan, Kalimantan, Indonesia); McLaughlin, 2002a: 419, fig. 3D−F; Siddiqui et al., 2004: 187, fig. 14; Rahayu, 2015: 183, figs. 1, 7A.

Material examined. 2 males, 1.5–2.2 mm, 1 female, 1.8 mm, 2 ovigerous females, 2.2 mm ( ZRC 2021.0151 ), SW53, Seringat Kias, artificial lagoon, 1°13.630′N 103°51.218′E, hand collecting, sandy beach, seagrass, 24 May 2013 ; 1 male, 2.5 mm ( ZRC 2021.0152 ), MF63, Pulau Senang, 01°10.469′N 103°44.183′E, mudflat, 30 June 2012 ; 2 males, 1.8–2 mm ( MZB Cru 5203), st. SW155, north lagoon St John’s Island , 1°13.116′N 103°51.079′S, 3 June 2013 ; 1 male, 2.4 mm ( ZRC 1994.4412 ), Kallang basin, 15 December 1994 .

Distribution. Persian Gulf, Pakistan, western Thailand, Singapore, Indonesia; intertidal, on rocky or sandy-muddy beach.

Remarks. Rahayu (2015) gave a short diagnosis and a description of the living colouration of this species. Diogenes klaasi is readily recognised by the presence of strong spines on the ventrolateral margin of the merus of the left cheliped which extends to the ventral surface and ventromesial margin. In life, the presence of fine brown oblique stripes on the ocular peduncle, which extends from the proximolateral and proximomesial angle towards the base of the cornea, and with slightly broader longitudinal stripe medially, and also the two black or dark brown spots on the shield, are characteristic to the species.

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.