Idaliadoris brasiliensis is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Onchidorididae.MolluscaBase eds. (2025). MolluscaBase. Idaliadoris brasiliensis (Alvim, Padula & Pimenta, 2011). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1618237 on 2025-09-09

Distribution This species was described from Praia do Forno, Arraial do Cabo, State of Rio de Janeiro, Brazil.

Diet The animals feed and lay eggs on the bryozoan Parasmittina protecta (Thornely, 1905).Padula, V. (2013) Knoutsodonta brasiliensis In Koehler, E. Medslugs.de, accessed on 2016-01-15.

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