This species has been observed on Reunion Island
Order : Nudibranchia
Suborder : Euctenidiacea
Superfamily : Doridoidea
Family : Dorididae
Distribution : Indo West Pacific
Maximal size : 25 mm
Abundance : Seldom if ever on the fore reef zone
Species characteristics :
show quite a bit of variation in the mantle colour,
including khaki, orange, dirty yellow, and blue-black mantles.
There is an opaque white or brown inverted ‘Y' or hourglass pattern extending mid-dorsally from between the rhinophores to just in front of the gill. In some specimens this pattern can be interrupted or almost absent.
The whole dorsum is covered with rounded, slightly conical tubercles, all of them similar in size. The largest tubercles are those situated in the central region of the body.
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Photo Christophe Cadet
Reunion, Etang salé, on the rocky coast, less 1 m, 9 December 2011, size : 10 mm
See more about : Sightening and mating periods
Identification confirmed by Nathalie Yonow
There are different opinion about the valid name : Siraius immonda for Rudman and Yonow, Doris immonda for Valdès and Gosliner, Siraius nucleola for Debelius and Nudipixel,
Synonynymous : (According Worms).
- Platydoris immonda Risbec, 1928
- Siraius immonda, (Risbec, 1928)
- Siraius nucleola, (Pease, 1860)
Bibliographic data :
Bill Rudman Seaslug site : Sea Slug Forum : Siraius immonda
Nudipixel Siraius nucleola
Baba, K (1993) A new record of Siraius nucleola (Pease, 1860) (Nudibranchia: Dorididae) from Japan. Venus, The Japanese Journal of Malacology 52(4) : 291-297.
Brodie, G.D. & Willan, R.C (1993) Redescription and taxonomic reappraisal of the tropical Indo-Pacific nudibranch Siraius nucleola (Pease, 1860) (Anthobranchia: Doridoidea: Dorididae). The Veliger 36(2) : 124-133.
Kay, E.A. & Young, D.K. (1969) The Doridacea (Opisthobranchia: Mollusca) of the Hawaiian Islands. Pacific Science 23(2) : 172-231.
Pease, W.H. (1860) Descriptions of new species of Mollusca from the Sandwich Islands. Proceedings of the Zoological Society of London 28 : 18-36.
Risbec, J. (1928) Contribution a l'etude des nudibranches Neo-Caledoniens. Faune des Colonies Francaises 2(1) : 1-328, Pls.1-12.
Valdés, A. (2002) A phylogenetic analysis and systematic revision of the cryptobranch dorids (Mollusca, Nudibranchia, Anthobranchia). Zoological Journal of the Linnean Society 136: 535-636.
Other photos of Doris immonda :
Reunion, Etang sale on the rocky coast, less 1 m, 8 Februay 2017
Reunion, Etang sale on the rocky coast, less 1 m, 11 February 2017, size : 5-10 mm
Reunion, Marine de Vincendo, less 1 m, 4 January 2011, size : 12 mm
The underside (a) is orange-yellow.
There is an opaque white or brown inverted ‘Y' or hourglass pattern extending mid-dorsally from between the rhinophores to just in front of the gill. In some specimens this pattern can be interrupted (b) or almost absent.
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