Felimare orsinii is one of a group of
Felimare species from the Mediterranean Sea which are all quite similar. This species can be distinguished from the others by the entirely blue gills and rhinophores and the small raised tubercles on the back. There is a single median white line which is slightly edged with blue and a line at the edge of the mantle which is white except at the sides where it grades into yellow. The body reaches a length of 20 mm. This species eats the sponge
Scalarispongia scalaris. Previously known as
Hypselodoris orsinii all Atlantic species of
Hypselodoris were shown to belong to a separate clade and were transferred to the genus
Felimare in 2012. ==Gallery==