Diogenes Dana, 1851

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 : 332-334

Diogenes Dana, 1851

Remarks. This genus is characterised by the presence of spinous, simple, very tiny or vestigial intercalary rostriform process between the ocular acicles, and absent or reduced crista dentata on the third maxilliped ischium. Forest (1952) and Rahayu & Forest (1995) separated the genus Diogenes into two informal groups based on the presence or absence of the lateral process on the endopod of the maxilla, and on the marginally spinose or simple intercalary rostriform process. Species with simple intercalary rostriform process (group 2 of Forest (1952)) were further grouped into the Troglopagurus group as defined by McLaughlin (2005), and the pallescens and edwardsii groups as defined by Asakura & Tachikawa (2010). At present, the genus Diogenes comprises 76 species, living in intertidal and subtidal areas, among coral rubbles, sand or mud substrates, distributed in the East Atlantic and Indo-West Pacific (absent in the Atlantic and the Pacific coast of American continent) ( Almon et al., 2021; Rahayu, 2021; Rahayu & Pratiwi, 2022). Previously 17 species of Diogenes were reported from Singapore ( Lemaitre & Ng, 1996; Rahayu, 1996, 2015; McLaughlin & Clark, 1997; McLaughlin, 2002b). In this paper one specific taxon is revived, and three more species are added to the fauna of Singapore, of which one is new to science.

Rahayu: Hermit crabs of Singapore