Atagema carinataAtagema carinata is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Discodorididae.DescriptionThe length of the species attains 40 mm.DistributionThis species was first recorded in the Firth of Thames in New Zealand in the 1820s, but has rarely been seen since. It appears to be a New Zealand endemic.