The Sea Lemon (Archidoris pseudoargus) is a species of mollusc found on our shores.
This sea slug is rather large, reaching 10cm in length, and is quite distinctive. An oval shaped mollusc, this species has feathery gills near the rear of it's body. At low tide, this species can be found under rocks. This species inhabits rocky shores in southern and western Britain. Variable in colour, this species is usaully yellow, hence the name.