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Trapania armilla  Gosliner & Fahey, 2008

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Trapania armilla is characterized by a completely white tuberculate body, except for a thin dark brown ring about two-thirds of the way along the oral tentacles. In Gosliner & Fahey's description are "two bifurcated extra-branchial appendages".
Pretty similar in general shape, that is also with a tuberculate body, extrarhinophoral and extrabranchial appendages is Trapania sp. 09, which differs by the greenish-tan colour.
Very similar white species of Trapania which differ by a smooth body, and lack the brown ring on the oral tentacles are:
Trapania aurata, which differs by orange pigment on the extra-branchial and extra-rhinophoral processes, and by an orange middorsal line at the posterior end of the foot,
Trapania gibbera, which differs by a dark brown bar between the oral tentacles, and by an orange middorsal line at the posterior end of the foot,
Trapania vitta, which differs by an orange middorsal line at the posterior end of the foot, and
Trapania cf. vitta which differs by orange pigment on the oral tentacles and on the gills
Trapania sp. 08, which differs by brown/black tipped white rhinophores, and by yellow/orange outer halfs of the extra-branchial and extra-rhinophoral processes.
More information on Trapania armilla are on Bill Rudman's Sea-Slug Forum!