A new genus and species of pilumnid crab (Decapoda: Brachyura: Pilumnidae) symbiotic with the spongeCallyspongiaDuchassaing & Michelotti, 1864 (Porifera: Demospongiae: Callyspongiidae) from Lombok, Indonesia; the identity ofPseudactumnus pestaeBalss, 1933; and a review of symbiosis in the Pilumnidae

Abstract

AbstractA new genus and new species of pilumnid crab, Ericiolumnus symbioticus (Decapoda: Brachyura), is described from the sponge Callyspongia Duchassaing & Michelotti, 1864 (Porifera: Callyspongiidae) in reefs in Lombok, Indonesia. The new taxon is characterized, among several characters, by the unusual shape of the carapace, which possesses sharp anterolateral teeth armed with secondary spinules, and prominently spinulous ambulatory legs. Another pilumnid, Pseudactumnus pestaeBalss, 1933, is shown to be a junior synonym of Actumnus asper (Rüppell, 1830). The pilumnid genus PseudactumnusBalss, 1933 is additionally synonymised with ActumnusDana, 1851. A review of symbiosis in Pilumnidae is also presented.