1. 4 Archidoris pseudoargus. Length 60mm. Underside of mantle uniformly coloured with no markings, but strong dorsal colour shows slightly through periphery. Small head with vestigal oral tentacles, only visible from underside. Menai Strait. March 2012.
2. 4 Archidoris pseudoargus. Length 60mm. Underside of mantle uniformly coloured with no markings, but strong dorsal colour shows slightly through periphery. Small head with vestigal oral tentacles, only visible from underside. Menai Strait. March 2012.

4 Archidoris pseudoargus. Length 60mm. Underside of mantle uniformly coloured with no markings, but strong dorsal colour shows slightly through periphery. Small head with vestigal oral tentacles, only visible from underside. Menai Strait. March 2012.