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Trapania aurata  Rudman, 1987

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Trapania aurata is characterized by a 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 white base but are primarily orange, the gills are white with orange edging on the dorsal side, and the rhinophore clubs are similarly white with orange at the tip and down the dorsal surface. There is an orange middorsal line at the posterior end of the foot.
Very similar are:
Trapania cf. aurata, which lacks the orange on the gills, rhinophores and at the posterior end of the foot,
Trapania vitta, which lacks the orange longitudinal band at the dorso-lateral processes.
Trapania cf. vitta, which has pur white dorso-lateral processes, and lacks the 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, and by translucent white gills, and lacks orange middorsal line at the posterior end of the foot,
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!