This species has been observed on Réunion, Mayotte and Madagascar Islands

Order : Nudibranchia Suborder : Euctenidiacea Superfamily : Doridoidea Family : Chromodorididae Distribution : Indian Ocean Maximal size : 70 mm Abundance : Species characteristics : The mantle is translucent white with many large opaque blotches all over, except around the edge which has a broad band of opaque white with a thin yellow band right at the edge. The simple gills are translucent white with red lining the inner and outer edge of each gill. (not in our specimens...) The rhinophore stalk is transparent and the club is opaque white with a yellow dash along the upper part of the anterior and posterior midline of the club .
	Showing species characteristics...	Photo Barbara Bini Madagascar, Nosy bé, 22-24 m, 30-40 mm

See more about : Sightening and mating periods

Remarks :

Identification confirmed by Nathalie Yonow
    Synonymous : (according Worms)
          - Glossodoris undaurum Rudman, 1985

Bibliographic data :

The underside of the animal is white, somewhat more opaque around the edge of the foot which is bordered with a yellow line.
     The animal is relatively high, the mantle elongately oval with the broad overlap thrown into a series of folds down each side.
    The gills are simple, and arranged in an arc open posteriorly, each end spiralling up into an internal secondary arc on each side.

References :

Bill Rudman Seaslug site : Sea Slug Forum : Glossodoris undaurum

Publications :

Rudman, W.B. (1985) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: Chromodoris aureomarginata, C. verrieri and C. fidelis colour groups. Zoological Journal of the Linnean Society 83 : 241-299
    Rudman, W.B. (1986a) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: The genus Glossodoris Ehrenberg (= Casella , H. & A. Adams). Zoological Journal of the Linnean Society 86(2) : 101-184
    Rudman, W.B. (1990b) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: further species of Glossodoris, Thorunna and the Chromodoris aureomarginata colour group. Zoological Journal of the Linnean Society, 100(3) : 263-326.

Other photos of Ardeadoris undaurum :

Antoine Legrand Mayotte Passe en S buoy 3, 40 m, size : 25 mm

Photo Cedric Peneau Reunion, Cap La Houssaye, 15 m, November 2013, size : 15 mm

Sully Bachel Reunion, Sec jaune, Saint Leu, 10 m, 31 October 2009, size : 25 mm

Sully Bachel Reunion, Les Avirons, 15 m, November 2012, size : 15 mm

If you have taken a photo of this species in South West Indian Ocean, please Contact us...