Distribution and status
Mediterranean to northern Scotland (GBIF map ). One of the rarest British nudibranchs (Thompson & Brown, 1984). Scattered records from northern Scotland to English Channel ( UK interactive map )
Ecology and behaviour
Most records sublittoral, on or near its erect bryozoans prey; species of Bugula (EML) and Scrupocellaria (UWN). When contracted, resembles a sea anemone . Both in extreme exposure (e.g. St Kilda) and extreme shelter (e.g. Lough Hyne). A relatively agile species with near neutral buoyancy, so very occasionally drifts on shore where it may be found in pools or in shallow water. Simultaneous hermaphrodite. Spawn a coiling line of white ovoids, each of which contains many ova , recorded September in wild, and May in refrigerator at 9° C.
Key identification features
- Cerata continue round anterior of head .
- Caruncle between bases of rhinophores .
- Many wart-like papillae on surface of cerata .
References and links
Alder, J. & Hancock, A. 1845-1855. A monograph of the British nudibranchiate mollusca. London, Ray Society.
Eliot, C.N.E. 1910. A monograph of the British nudibranchiate mollusca. London, Ray Society. Supplementary volume.
Thompson, T.E. & Brown, G.H. 1984. Biology of opisthobranch molluscs 2. London, Ray Society.
Unter Wasser Welt Nordsee (UWN)
Current taxonomy; World Register of Marine Species (WoRMS)
Irish Distribution maps and prey organisms;
Picton, B.E. & Morrow, C.C., 2010. Encyclopedia of Marine Life of Britain and Ireland (EML)
Body (excluding appendages)