Tritonia lineata
Alder & Hancock, 1848

Family: Tritoniidae


European Atlantic coast from south Norway to Mediterranean.


8 mile reef, Loch Etive on the west coast of Scotland. At 28 metres in 10 deg C water, an 18mm long individual, one of several found crawling on boulders. 22 July, 2001. Photo: Jim Anderson.

Animal translucent white in colour with a thin opaque white line running around the mantle just inside the line of the gills and around the anterior end of the mantle, broken only for the rhinophores bases. Posteriorly the lines join to form a single median line running to the posterior tip of the body. At the base of each gill, the white line runs out to the fill forming a rought triangular white patch on the inside edge of the gill bases. There is no white line edging the foot,

T. lineata has 4 tentacles on the oral veil. The egg ribbon consists of a simple spiral. This species grows to approx 34 mm in length. Its food is at present unknown. It is similar in colour to Tritonia festiva from the north Pacific.

  • Alder, J. & Hancock, A. (1848). Additions to the British species of Nudibranchiate Mollusca. Annals & Magazine of Natural History, 1(2): 189-192
Authorship details
Rudman, W.B., 1999 (September 8) Tritonia lineata Alder & Hancock, 1848. [In] Sea Slug Forum. Australian Museum, Sydney. Available from

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