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Roboastra gracilis (Bergh, 1877) [Nembrotha]

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Roboastra gracilis is charaterized by its black mantle with red or yellow/orange longitudinal lines which are sometimes quite obscure and by the long blue gills. The rhinophores and the oral tentacles have the same colour as the gills.
Very similar are the juveniles of Roboastra luteolineata, which differ by a dark lines on the gills, and by yellowish-green markings between the rhinophores.
More information on Roboastra gracilis are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 30 March 2016, Roboastra gracilis (Bergh, 1877)
available from http://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Roboastra_gracilis.htm