This species has been observed on Reunion and Madagascar Islands
Order : Nudibranchia
Suborder : Euctenidiacea
Superfamily : Doridoidea
Family : Chromodorididae
Distribution : South Africa, Sri Lanka, Madagascar and Reunion
Maximal size :
Species characteristics :
Colour opaque white with violet pigment concentrated around edges and on head around and between rhinophores
Fine sub-marginal white line, followed by an orange marginal band more prominent in the central constriction
Rhinophores very large with translucent stalk and white core covered in orange-red lamellae
Eight gills simply pinnate, arranged in circle around anal papilla; white ‘core’ and orange lamellae; orange line along both inner and outer edges of each gill.
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Photo Kevin Bourdon
Reunion, La Possession, 6 m, 7 august 2013
Identification proposed by Nathalie Yonow. (Yonow, 2012) Rudman considered that it's a variant of Thorunna horologia
Looks like Thorunna horologia but T. horologia is white with orange then red marginal band and the rhinophore are white with only a red mark along the upper half of the anterior and posterior midlines
Bibliographic data :
Margin permanently convoluted with three indentations: one behind rhinophores, largest in centre of body, one just beyond gills.
Foot pale violet, darker concentration of violet in band around metapodium
Bill Rudman Seaslug site : Sea Slug Forum : Thorunna horologia
Yonow N (2012) Opisthobranchs from the western Indian Ocean, with descriptions of two new species and ten new records (Mollusca, Gastropoda). ZooKeys 197: 1-129. doi: 10.3897/zookeys.197.1728
Other photos of Thorunna cf. horologia :
Madagascar, Nosy bé, Plateau des arches, 18 m, size : 4 mm
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