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The nudibranch Dendrodoris nigra (Stimpson, 1855) has hitherto been considered as a single, highly polychromic species. Our investigations of external morphology, anatomy and colour variation have revealed more than one species exists. This conclusion gives credibility to the previous discovery of differing developmental patterns within D. nigra. Besides D. nigra, we recognise Dendrodoris fumata (RUppell & Leuckart, 1830) which has three distinguishable colour forms. The occurrence of D. nigra is confirmed to be extensive, however, the species was not found to be circum-Austra lian as previously reported. The presence of D. fumata in Australia is confirmed and the species is also reported from Hong Kong and Fiji for the first time. The clear separation of these two species and recognition of the different colour forms will permit a more accurate picture of their distribution.

TAXONOMY AND OCCURRENCE OF DENDRODORIS NIGRA AND DENDRODORIS FUMATA (NUDIBRANCHIA: DENDRODORIDIDAE) IN THE INDO-WEST PACIFIC REGION