Doridunculus unicus
Doridunculus unicus is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Onchidorididae.
Discovery
Doridunculus unicus was first discovered in deep-sea basin of the Sea of Japan. The absence of notal crests, asymmetricalnotal lobes, and characteristics of the radula anatomy distinguish Doridunculus unicus from the two other known specimens of the species. The peculiar feeding ecology of the new species was re-discovered. D. unicus feeds on the hydroids Egmundella sp. and dwells in large aggregations of their colonies.Unicus refers to three distinct characteristics: the history of discovery and description, asymmetrical notal lobes, and living with and feeding on hydroid.