This species has been observed on Mayotte and Madagascar Islands
Order : Nudibranchia
Suborder : Euctenidiacea
Superfamily : Polyceroidea
Family : Gymnodorididae
Ryukyu Archipelago, Solomon Islands, Malaisie, Maldives, and Mayotte
Maximal size : 10 mm
Species characteristics :
Body smooth, uniformly bluish black
Gills small, consisting of 9 plumes arranged in a complete circle around the anus.
Rhinophores and gills also bluish black.
|Showing species characteristics...
Photo Eva Fontaine Mayotte, Mtsanga Mboueanatsa, on the reef flat zone, less 1 m, 4 August 2008, size : 10-15 mm.
See more about : Sightening and mating periods
Identification confirmed by Nathalie Yonow
Synonymous : (according Worms)
- No other name
Bibliographic data :
It has a remarkable association with a number of species of gobies ( Amblyeleotris steinitzi, Amblyeleotris wheeleri, Ctenogobiops pomastictus), apparently living permanently on their fins, and feeding on the skin between the fin rays. Osumi & Yamasu (1994) suggest that the association is nearer to parasitism than symbiosis.
The nudibranchs have been seen on all eight fins of the gobies: pectoral, pelvic, first dorsal, second dorsal, caudal, and anal.
In some cases multiple nudibranchs have been seen on the same goby...
Bill Rudman Seaslug site : Sea Slug Forum : Gymnodoris nigricolor
Baba,K (1960): The genera Gymnodoris and Nembrotha from Japan (Nudibranchia - Polyceridae). Publications of the Seto Marine Biological Laboratory 8(1) : 71-74.
Williams, E.H. & Williams, L.B. (1986) The first association of an adult mollusk (Nudibranchia: Doridae) and a fish (Perciformes: Gobiidae). Venus, The Japanese Journal of Malacology, 45(3) : 210-211
Mulliner, D.K. (1991) Contact Association between the nudibranch Gymnodoris nigricolor Baba, 1960 (Gymnodorididae) and the Datehaze Goby (Perciformes: Gobiidae). Western Society of Malacologists Annual Report 23 : 17.
Osumi, D. & Yamasu, T. (1994) The nudibranch Gymnodoris nigricolor Baba, parasitic with marine Gobies. Zoological Science, 11 (Supplement: Proceedings of the 65th Annual Meeting of the Zoological Society of Japan) : 54.
Other photos of Gymnodoris nigricolor :
Madagascar, Nosy bé, Sakatia bay, 6 m, 29 March 2014, size : 30 mm
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