Idaliadoris neapolitana is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Onchidorididae.MolluscaBase eds. (2025). MolluscaBase. Idaliadoris neapolitana (Delle Chiaje, 1841). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1618234 on 2025-09-09
Distribution This species was described from Naples, Italy. It has also been reported from Numana, Ancona, Italy and the Mediterranean Sea coast of Spain.Ballesteros, M., E. Madrenas, M. Pontes et al. (2012-2016) Onchidoris neapolitana in OPK-Opistobranquis. Published: 17/05/2012, Accessed: 20/01/2016.
Diet Idaliadoris neapolitana feeds on the bryozoan Schizobrachiella sanguinea.Rudman, W.B., 2006 (April 26) Onchidoris neapolitana (Delle Chiaje, 1841). [In] Sea Slug Forum. Australian Museum, Sydney.
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