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This species has been observed on Mayotte

Order : Nudibranchia Suborder : Dexiarchia Superfamily : Tritonioidea Family : Tritiniidae Distribution : Tropical Indo-West Pacific. Maximal size : 15 mm Abundance : Species characteristics : The general body colour is uniformly pinkish lilac and there is a white streak mid dorsally on the tail The blood red to pale orange rhinophores bear numerous long papillae all over and they therefore resemble an upraised hand (palmate) The whitish to cream bifid cerata are smooth, curving upwards, and they taper to a pointed tip The basal quarter of the oral tentacles is magenta and the rest is opaque white.
	Showing species characteristics...	Matthias Deuss Mayotte, Ilots d'hajangoua, less 1 m, 17 December 2012, size : 10-12 mm

See more about : Sightening and mating periods

Remarks :

Identification confirmed by Nathalie Yonow
    Synonymous : (according Worms)
               - Mariana rosea Pruvot-Fol, 1930

Bibliographic data :

The body bears up to four clusters of cerata, there being only two cerata per cluster and the clusters being arranged strictly in pairs. The cerata are smooth, curving upwards, and they taper to a pointed tip (fusiform). The cerata are uniformly cream.
    The rhinophoral clavus is blood red to pale orange. Each rhinophore is surrounded by an elongate, tubular sheath with simple margins that is drawn out into a spike laterally. The rhinophoral sheath is the same color as the body basally and the tip is cream.
    The oral tentacles are large, slender, and tapering to a pointed tip.
    The anterior foot corners are enlarged into prominent, slender, sharply pointed tentacles.
    In this family the rhinophores have a ring of vertical papillae which form a circle around the central stalk
    It feeds on hydroids, unlike most tritoniids.
    It deposits a white spawn mass on its food hydroids.

References :

Bill Rudman Seaslug site : Sea Slug Forum : Marianina rosea
   Nudipixel Marianina rosea

Publications :

Pruvot-Fol, A. (1930). Diagnose provisoires (incomplètes) des espèces nouvelles et liste provisoire des mollusques nudibranches recueillis par Mme. A. Pruvot-Fol en nouvelle Calédonie (Ile des Pins). Bulletin Muséum National d'Histoire Naturelle Paris, series 2, 2(2) : 229-232

Other photos of Marianina rosea :

Matthias Deuss Mayotte, Ilots d'hajangoua, less 1 m, 17 December 2012, size : 10-12 mm The rhinophores bear numerous long papillae (a) all over and they therefore resemble an upraised hand (palmate). The rhinophoral clavus is blood red to pale orange Each rhinophore is surrounded by an elongate, tubular sheath with simple margins that is drawn out into a spike laterally (b). The rhinophoral sheath is magenta basally and the tip is cream.

Fabrice Schubert Mayotte, 22 January 2010 The body bears up to four clusters of cerata, there being only two cerata per cluster and the clusters being arranged strictly in pairs. The cerata are smooth, curving upwards, and they taper to a pointed tip (fusiform). The cerata are uniformly cream.

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