This species has been observed on Mayotte and Madagascar Island
Order : Nudibranchia
Suborder : Euctenidiacea
Superfamily : Doridoidea
Family : Chromodorididae
Distribution : Tanzania, Kenya, Red Sea, Andaman Sea and Madagascar.
Maximal size : 20 mm
Abundance : Seldom if ever on the fore reef zone
Species characteristics :
The body is white with a bright yellow border to the mantle.
The simply pinnate gills and rhinophores have red midribs and may have red edges on the lamellae.
|Showing species characteristics...
Photo Alain-Benoît Rassat
Madagascar, Nosy bé, plateau des Arches, 17 m, 15 December 2012, size : 15-20 mm
See more about : Sightening and mating periods
Identification confirmed by Nathalie Yonow and Hsini Lin
Synonymous : (according Worms)
- No other name
Bibliographic data :
The body is relatively high and elongate with a narrow mantle overlap
which is sometimes thrown into three major folds down each side of the
It feeds on Dysidea sp
The rhinophore is white with a red line along the anterior and posterior midline of the club.
The gills are simple, forming a circle around the anus. They wave
rhythmically when the animal is crawling. The outer edge of the white
gills is also red and sometimes the upper half or third of the inside
edge is also red.
Species of Thorunna
are quite small, for chromodorids, and one characteristic feature is
that the gills are held upright in a goblet-shaped group, and they wave
rhythmically as the animal crawls along.
Similar in color and shape to Thorunna furtiva but T. africana has :
- in having a yellow mantle border
- and a red edging to gills and rhinophores.
present in the western pacific has an orange border to the mantle and
orange edging to the rhinophores and outer edge of each gill
Bill Rudman Seaslug site : Sea Slug Forum : Thorunna africana
Nudipixel Thorunna africana
Johnson R.F. & Gosliner T.M. (2012) Traditional taxonomic groupings
mask evolutionary history: A molecular phylogeny and new classification
of the chromodorid nudibranchs. PLoS ONE 7(4): e33479.
Rudman, W.B. (1984) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: a review of the genera. Zoological Journal of the Linnean Society 81 : 115-273.
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
Other photos of Thorunna africana :
Mayotte, Plage du Faré, less 1 m, 20 January 2018
Madagascar, Nosy bé, 20 m, size : 20 mm
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