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Trapania cf. aurata  Rudman, 1987

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cf. is an abbreviation from a Latin word (confer) and means 'refer to' or 'compare with', here it means it could possibly be Trapania aurata or perhaps something closely related, or at least similar in appearance.
Trapania cf. aurata is characterized by its uniformly white body. The extra-rhinophoral appendages and the extra-branchial appendages are white with an orange longitudinal band near the apices. The oral tentacles have a translucent whitish base but are primarily orange, the gills and the rhinophores are uniformly white.
Very similar are:
Trapania aurata, which differs by the orange edging on the dorsal side of the gills, by orange at the tip and down the dorsal surface of the rhinophores, and by an orange middorsal line at the posterior end of the foot, and
Trapania vitta, which lacks the orange longitudinal band at the dorso-lateral processes, and differs by the orange edging on the dorsal side of the gills, by orange at the tip and down the dorsal surface of the rhinophores, and by an orange middorsal line at the posterior end of the foot.
Trapania cf. vitta, which differs by uniformly white dorso-lateral processes, but has also no orange middorsal line at the posterior end of the foot, and
Trapania gibbera, which differs by a dark brown bar between the oral tentacles,
Trapania sp. 08, which differs by brown/black tipped rhinophores
Trapania armilla, which differs by a tuberculate body, and by a thin dark brown ring on each oral tentacle.
More information on Trapania aurata are on Bill Rudman's Sea-Slug Forum!