Click the thumbnail photos to enhance!
Trapania cf. vitta is characterized by a white body, including white tentacular anterior foot corners, and white dorso-lateral processes. The oral tentacles have a white base but are primarily orange, the gills are white with orange edging on the dorsal side, and the rhinophores clubs are similarly white with orange at the tip and down the dorsal surface.
Trapania cf. vitta differs from Trapania vitta by the posterior end of the foot which lacks a median orange line.
Very similar are:
Trapania aurata, it differs by the dorso-lateral processes, which have an orange longitudinal line, and by the orange longitudinal line on the posterior end of the foot
Trapania cf. aurata, which differs by the orange longitudinal bands at the dorso-lateral processes, and
Trapania gibbera, which differs by a dark brown bar between the oral tentacles.
Trapania sp. 08, which differs by brown/black tipped rhinophores, and by translucent white gills.
Trapania armilla, which differs by a tuberculate body, and by a thin dark brown ring on each oral tentacle.
More information on Trapania vitta are on Bill Rudman's Sea-Slug Forum!