Selection: Thecacera sp. A

Thecacera sp. A Genus: Fleming, 1828

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Thecacera sp. A is characterized by its orange body with purple-black spots, the extrabranchial processes are orange with a black apex. It differs from similar undescribed species of the genus Thecacera by its black tipped orange rhinophores, and the arrangemant of the black spots.
It is Thecacera sp. 4 in IPN:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp. at page 110
Pretty similar is Thecacera pacifica which lacks the black spots on the body and does have a black line along the outside edge each gill, its extrabranchial processes, extrarhinophoral processes and the 'tail' are white tipped diffusing into blue then into a black band.
More informations on Thecacera sp. A are at Bill Rudman's Sea-Slug Forum!