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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 3 long blue gills. The rhinophores and the oral tentacles have the same colour as the gills.
Very similar are:
- the juveniles of Tyrannodoris luteolineata, which differ by a dark lines on the gills, and by yellowish-green markings between the rhinophores, and have continuous longitudinal stripes.
- Roboastra sp. 01  Genus: Bergh, 1877 which differs by the gills: Roboastra gracilis has always 3 long gills, in Roboastra sp. 01 are 4 or 5 of them and they are shorter.
More information on Roboastra gracilis are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2021), published 5 January 2021, Roboastra gracilis (Bergh, 1877)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Roboastra_gracilis.htm

 
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