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When disturbed Moridilla brockii unrolls the large rolled cerata and points them at the source of the disturbance.
Another aeolid with similar behaviour is Phidiana salaamica.
Pretty similar is Moridilla sp. 01 Genus: Bergh, 1888 which diffes by white mottling on the cerata, and by a subapical whitish ring on the rhinophores.
More information on Moridilla brockii are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 21 November 2017, Moridilla brockii Bergh, 1888
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Moridilla_brockii.htm