On a new species of Elamenopsis from Singapore, with notes on Crustaenia palawanensis (Serène, 1971) (Crustacea: Decapoda: Brachyura: Hymenosomatidae)

Abstract

A new species of Elamenopsis A. Milne Edwards, 1873, is described from Singapore. Elamenopsis rotunda, new species, can easily be distinguished from the three known congeners by its proportionately narrower carapace and relatively thinner ambulatory legs. Elamenopsis rotunda is perhaps most similar to E. ariakensis but also differs in the shapes of their rostrums and anterolateral margins of their carapaces. This represents the fifth hymenosomatid species from Singapore. Crustaeniapalawanensis (Serène, 1971), one of five hymenosomatid species known from Singapore, is also examined. Although it has a posterolateral tooth like some Neorhynchoplax species, this tooth is placed on the carapace rim rather than on the lateral wall. This is another character that can be used to separate Crustaenia from Neorhynchoplax at the genus level. © National University of Singapore.