This species has been observed on Mayotte, Seychelles, Madagascar, Zanzibar
Superfamily : Limapontioidea
Family : Caliphyllidae
Maximal size : 30-40 mm
Abundance : (May) Seldom if ever on the fore reef zone
Species characteristics :
The cerata are basically black and gold. The margin of each cerata is vivid white and below that is usually a golden band. Below that again are many golden spots
The long bifurcated rhinophores are black with pale longitudinal lines extending up both forks
|Showing species characteristics...
Photo Yvon Gildas
Mayotte, Passe en S, buoy n°6, 6 m, 24 June 2009
See more about : Sightening and mating periods
Identification confirmed by Nathalie Yonow and Hsini Lin
Bibliographic data :
The same colouration is usually present on both faces of each cerata
The body is a typical shape for a species of Cyerce with bifurcating rhinophores
The sole of the foot bears a groove across its center
It lays a flat, broad, white egg masses consisting of three and a quarter turns.
This Sacoglossa can change the orientation of its cerata according to its behavior.
- At rest, the cerata are flattened and overlapped in longitudinal series like scales
- When this Sacoglossa crawls, the cerata are elevated and curled
- When strongly stimulated, this Sacoglossa swims by powerfully flapping its cerata in coordinated waves
The cerata are cast off (autotomised) very readily when an animal is irritated, even touched lightly
In the West Pacific they feed on the green algae Chlorodesmis fastigiata, commonly known as turtle weed.
C. nigricans is closest to C. nigra but that species has a series of transverse white line across the outer surface of the cerata instead of the golden spots
Bill Rudman Seaslug site : Sea Slug Forum : Cyerce nigricans
Nudipixel Cyerce nigricans
Pease, W.H. (1866). Remarks on nudibranchiata inhabiting the Pacific islands, with descriptions of two new genera. American Journal of Conchology 2(2) : 204-208
Jensen, K.R. (2007). Biogeography of the Sacoglossa (Mollusca, Opisthobranchia). Bonner Zoologische Beiträge. 55: 255–281
Other photos of Cyerce nigricans :
Mayotte, Passe en S, buoy n°6, 6 m, 25 July 2009
The margin of each cerata is vivid white (a) and below that is a golden band (b). Below that again are many golden spots (c)
Nicole Gravier Bonnet
Bassas de India,
In the green algae Chlorodesmis sp, (probably fastigiata) commonly known as turtle weed.
Seychelles, Curieuse Island, 2 m, 23 September 2010
The margin of each cerata is vivid white and below that is a golden band. Below that again are many golden spots.
Madagascar, Nosy Bé, 16 m, July 2017, size : 30 mm
More photos from Indian Ocean
Zanzibar, Cyerce nigricans by Arnaud Douay