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Trapania gibbera  Gosliner & Fahey, 2008

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Trapania gibbera is characterized by an opaque white body. The extra-branchial and extra-rhinophoral processes are also white. The gills and rhinophores are translucent clear with orange edgings. Between the orange oral tentacles is a distinctive dark brown/black transverse bar. It grows up to 10 mm.
Very similar white species of Trapania which lack the black bar on the head 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 cf. aurata, which differs by white rhinophores
Trapania vitta, which differs by an orange middorsal line at the posterior end of the foot,
Trapania cf. vitta
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, and
Trapania armilla, which differs by a tuberculate body, and by a thin dark brown ring on each oral tentacle.
More information on Trapania gibbera are on Bill Rudman's Sea-Slug Forum!