Knoutsodonta brasiliensis is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Onchidorididae.

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

[1] The animals feed and lay eggs on the bryozoan Parasmittina protecta (Thornely, 1905).

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