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This species has been observed on Reunion and Madagascar Islands

Order : Sacoglossa Superfamily : Limapontioidea Family : Costasiellidae Distribution : Indo West Pacific Maximal size : 5 mm Abundance : From time to time on the rocky coast Species characteristics : This species has white pigment on the head and rhinophores and a black area just behing the rhinophore The rhinophores are white The cerata are transparent, with the green contents showing through the body wall and speckle with white and yellow tiny dots.
	Showing species characteristics...	Photo Nathalie Rodrigues Reunion, 13 December 2015

See more about : Sightening and mating periods

Remarks :

Identification confirmed by Kathe Jensen

Bibliographic data :

This species is similar with Costasiella kuroshimae by C. kuroshimae differs by :
           - The head has a broad brownish band from the rhinophores to the mouth, and their is a second brown patch from the rhinophores back towards the pericardium.
           - The upper half or the tips of the white rhinophores are black
    Found in association with Avrainvillea sp (green algae with a post like "stalk" and a flattened plate-like "leaf")

References :

Publications :

Costasiella sp. 1 (p79) in Nudibranch and Sea Slug Identification Gosliner, Valdés and Behrens 2015

Other photos of Costasiella sp. 2 :

Alain-Benoît Rassat Madagascar, Nosy bé

Christophe Cadet Reunion, Etang salé, on the rocky coast, less 1 m, 8 February 2013, size : 4-5 mm   Found in association with Avrainvillea sp (green algae with a post like "stalk" and a flattened plate-like "leaf")

Alexandre Laporte Reunion, Etang Salé on the rocky coast, less 1 m, 3 April 2015, size : 4 mm

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