Idaliadoris tridactila is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Onchidorididae.MolluscaBase eds. (2025). MolluscaBase. Idaliadoris tridactila (Ortea & Ballesteros, 1982). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1618241 on 2025-09-10
Distribution This species was described from Verdicio, Asturias, on the Atlantic Ocean coast of Spain, . Additional specimens were found nearby at El Puntal, .
Description Idaliadoris tridactila is similar in appearance to Knoutsodonta depressa but is distinguished by having a rhinophore sheath with three elongate tubercles, similar to the ones which cover the dorsal surface of the mantle.
Diet This species was found on the bryozoan Schizomavella linearis which is a food also reported for Knoutsodonta depressa.
See also Knoutsodonta
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