The sea cucumbers of Camden Sound in northwest Australia, including four new species (Echinodermata: Holothuroidea)

Abstract

O’Loughlin P.M., Harding, C. & Paulay, G. 2016. The sea cucumbers of Camden Sound in northwest Australia, including four new species (Echinodermata: Holothuroidea). Memoirs of Museum Victoria 75: 7–52. All sea cucumbers collected from Camden Sound by the Kimberley Marine Research Program in 2015 are reported, with live colour illustrations of the species. Four new species are described, with O’Loughlin as author: Holothuria (Metriatyla) keesingi; Neothyonidium(?) insolitum; Plesiocolochirus minaeus; Protankyra torquea. Colochirus quadrangularis Troschel, the type species of Colochirus Troschel, is reviewed and a sensu stricto diagnosis is provided for Colochirus. Plesiocolochirus spinosus (Quoy & Gaimard), the type species of Plesiocolochirus Cherbonnier, is reviewed and a sensu stricto diagnosis is provided for Plesiocolochirus. Colochirus robustus Östergren is confirmed for NW Australia, but not for Camden Sound. Pseudocolochirus axiologus (H. L. Clark) is raised out of synonymy with Pseudocolochirus violaceus (Théel). Thyone papuensis Théel is reported from Camden Sound and the species is reviewed and illustrated. We report Thyone pedata Semper from Joseph Bonaparte Gulf in northern Australia, but not for Camden Sound. The WA Naturalists Club visited “Camden Harbour” in 1990 and Marsh reported on the marine invertebrates. Two sea cucumber species from this report are included here. A phylogenetic tree is provided with sequences for species of Colochirus and Plesiocolochirus. A table is provided with a list of all sea cucumbers collected from Camden Sound. Tissue samples for genetic analysis were taken from all specimens, and tissue data are listed in two tables. Two Pilumnidae crabs were found in the coelom of the new species Plesiocolochirus minaeus.