Report on some commensal pontoniinid shrimps (Crustacea: Palaemonidae) associated with an Indo-Pacific gorgonian host (Coelenterata: Gorgonacea)



The occurrence of two rare shrimps and a new species of the subfamily Pontoniinae (Crustacea, Decapoda, Natantia, Palaemonidae), previously considered to be free-living, in association with the gorgonian Mopsella eltisi Hickson is recorded. The new species is described and illustrated and some observations are made upon the morphology, size, distribution and systematics of the other species of shrimps. A key to the known species of the genus Hamodactylus is provided and the species of pontoniinid shrimps known to be associated with gorgonians are reviewed.