Rostanga ankyra
Rostanga ankyra is a species of sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Discodorididae". Distribution. This species was collected from depth, south of New Caledonia, Description. The living animal is uniformly white, with typical shape and caryophyllidia covering the mantle surface as is normal for species of "Rostanga". Only three species of "Rostanga" are white in colour, "Rostanga setidens" and "Rostanga phepha". "Rostanga phepha" has the dorsum covered with purplish brown spots.