Felimare tricolor, also known as Hypselodoris tricolor and Hypselodoris midatlantica, is a colourful species of sea slug or dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae, superfamily Doridoidea, class Gastropoda and phylum Mollusca.
This nudibranch is found from the Western Mediterranean to the Eastern Atlantic Ocean.
Hypselodoris tricolor has a blue body with white-to-orange longitudinal lines running along the body. There is also a single central white-orange line on the upper dorsum. The gills and rhinophores are black. There is some variation in colour between individuals.
This species can reach a total length of at least 25 mm and has been observed feeding on sponges from the genus Dysidea.
This photo was taken at Reqqa Point on Gozo’s north coast.
Photo taken by Brian Azzopardi