﻿AbstractThe study of a well-preserved collection of discodorid nudibranchs collected in Koumac, New Caledonia, revealed the presence of seven species new to science belonging to the generaAtagema,Jorunna,Rostanga, andSclerodoris, although some of the generic assignments are tentative as the phylogeny ofDiscodorididaeremains unresolved. Moreover, a poorly known species ofAtagemaoriginally described from New Caledonia is re-described and the presence ofSclerodoristuberculatain New Caledonia is confirmed with molecular data. All the species described herein are highly cryptic on their food source and in the context of the present study the term “cryptic” is used to denote such species. This paper highlights the importance of comprehensive collecting efforts to identify and document well-camouflaged taxa.