Widely distributed throughout the Atlantic Ocean from Iceland and Norway to the Mediterranean, and from Brazil to North America.
St. Kilda, Outer Hebrides, Scotland, 1993. 2-3mm long. PHOTOS: Daniel Geiger.
Small aeolid growing to about 8mm. each branch of the digetsive gland leads to only a single ceras. Feeds on a wide variety of hydroids and can be locally very abundant. Swennen (1959) reports population densities of 500 per square meter at a site in Holland.
• Swennen, C. (1959) The Netherlands coastal waters as an environment for Nudibranchia. Basteria, 23: 56-62.
• Thompson, T.E. & Brown, G.H. (1984) Biology of Opisthobranch Molluscs, Vol 2. Ray Society: London.
Rudman, W.B., 2000 (December 31) Tergipes tergipes (Forskal, 1775). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/tergterg