Idaliadoris bouvieri is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Onchidorididae.MolluscaBase eds. (2025). MolluscaBase. Idaliadoris bouvieri (Vayssière, 1919). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1618236 on 2025-09-09
Description The length of the body varies between 3 mm and 4 mm, its diameter between 1.8 mm and 2.3 mm, its height 1 mm.
(Original description in French) The body is relatively depressed and elliptical, with a very large mantle that broadly covers it. Numerous conical papillae, which are quite strong, are irregularly distributed over the entire dorsal surface of the mantle. The gill is composed of 7 well-defined, oval, pinnate leaflets.
The buccal veil is quite extensive, rounded, and lacks lateral extensions. The foot has an area half the size of the mantle; it is oblong with a slightly rounded, truncated anterior edge.
The general coloration is a pale, translucent flesh-pink. Numerous rust-brown spots are spread across the mantle, which may be more pronounced along three longitudinal bands: one median and two lateral. The rhinophores and the gill are a yellowish pink.
The radula has 34 rows with a formula of 1,1,0,1,1. The intermediate tooth is lamellar with a broad, quadrangular base and a hooked cusp whose outer edge is equipped with about a dozen denticles. The lateral or marginal tooth is also lamellar and almost square, slightly curled inward on its inner face, with a very rudimentary cusp.Vayssière A. (1919). Recherches zoologiques et anatomiques sur les mollusques opistobranches du Golfe de Marseille, 2e suppl. Annales du Musée d'Histoire Naturelle de Marseille, 17: 53-92.
Distribution This species was described from Carry-le-Rouet on the Mediterranean Sea coast of France. It is similar to Onchidoris depressa and has not been reported since the original description.Trainito, E. & Doneddu, M. (2014). Nudibranchi del Mediterraneo. 2nd Edition. Il Castello. , 192 pp. page 18.
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