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Roboastra tentaculata was originally posted at these websites as Roboastra luteolineata (Baba, 1936) [Nembrotha] because I thought it might be a juvenile or a colour morph of it. It was originally placed in the genus Tambja, and transferred to Roboastra by Pola et al. 2008 in
Pola, M., Cervera, J.L. and Gosliner, T.M. 2008. Description of the first Roboastra species (Nudibranchia, Polyceridae, Nembrothinae) from the western Atlantic. Bulletin of Marine Science, 83: 391-399
More informations on Roboastra tentaculata as Tambja tentaculata are at Bill Rudman's Sea-Slug Forum!