Phidiana bourailli (Risbec, 1928)

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This species has been observed on Reunion and Mayotte Islands

Order : Nudibranchia
Suborder : Dexiarchia
Superfamily : Aeolidioidea
Family : Facelinidae
Distribution : Indo West Pacific
Maximal size : 15 mm
Abundance :

Species characteristics :

The body is translucent white with opaque white spots and thin short interrupted vivid vermillon lines arranged longitudinally

The rhinophores are slender each has 3 to 5 white annuli on the upper half and the tip is rounded

Cerata black to dark brown basally with lighter pigment and opaque white longitudinal lines (abscent in western Indian Ocean)

phidiana bourailli
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Photo Alexandre Laporte
Reunion, Etang salé on the rocky coast, less 1 m , 7 April 2017, size : 5 mm

See more about : Sightening and mating periods

Remarks :

Identification confirmed by Hsini Lin
    Specimen from the western indian with orange lines rather than spots lacking opaque white lines on the cerata
    Synonymous : (according Worms)
               - Aeolidia bourailli Risbec, 1928
               - Facelina bourailli (Risbec, 1928)

Bibliographic data :

Body shape typical for genus, elongate and farly high, with a prominent pericardial hump.
    The cerata are short and arranged in orderly clusters, or groups of rows.
    The rhinophores are watery orange occasionally with white speckles
    The oracle tentacle are translucent white with white spots and/or bands and sometimes with a faint orange ring.
    On the head there are also orange streaks and spots, in some cases forming a pair of broken orange lines from the front of the head to the base of the rhinophores. Similar orange marks appear on the dorsum between the cerata and on the sides of the body.
    The digestive gland duct and contents is usually a light brown colour.
    Feeds on hydroids including Salacia tetracythara and Thyroscyphus fruticosus

References :

Bill Rudman Seaslug site : Sea Slug Forum : Phidiana bourailli
   Nudipixel Phidiana bourailli

Publications :

Garcia F.J. & Troncoso J.S. (2003) Two unknown species of Mollusca Gastropoda from Archipelago Fernando de Noronha (Brazil), with description of a new species belonging to the genus Phidiana Gray, 1850 and a new record of Dendrodoris senegalensis Bouchet, 1975. Scientia Marina 67(2): 159-166
    Rudman, W.B. (1980) Aeolid opisthobranch molluscs (Glaucidae) from the Indian Ocean and the south-west Pacific. Zoological Journal of the Linnean Society, 68 : 139-172.

Other photos of Phidiana bourailli :


Christophe Cadet

Réunion, Etang salé on the rocky coast, less 1 m, 2 November 2010, size : 5-8 mm


Quentin Lognoné

Mayotte, tombant des aviateurs, petite Terre, 10 June 2017






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