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Acteon tornatilis found between roots of  Manggrove, Waigeo Island, Raja Ampat.

Acteon tornatilis (Linnaeus, 1758), is a primitive sea slug within a thick, opaque, pink, external shell of up to 2-3 cm that is marked by 1-3 white bands on the body whorl and 1 white band on the remainder. Either side of each band is a narrow margin of dark pink. It is able to withdraw the whole of its body into its shell which is then sealed by an amber-coloured operculum. The shell aperture accounts for two-thirds of the shell length. Inside the lip of the shell is a distinctive tooth. The head of Acteon tornatilis has four large lobes and a cephalic disc that is used in burrowing through clean, fine sand together with a small foot that has blunt, propodial tentacles. Inside of the shell are folded mantle flaps.

Acteon tornatilis is a carnivore, feeding on tubiculous, infaunal polychaetes, including Owenia fusiformis and Lanice conchilega.

Acteon tornatilis has previously been known as Tornatella fasciata (pre-1950). Four species of the Acteon genus are found in Europe.

(Encyclopedia of Life; The Marine Biological Association of the United Kingdom, Marine Life Information Network)

 Acteon tornatilis has been recorded from scattered locations around the UK and Ireland. Records are rare from the east coast of England. Acteon tornatilis is found especially in sheltered sandy bays or in deep water from low water to 250 m depth. As well as inhabiting sandy sediments, Acteon tornatilis is also found in sandy mud and gravel. Acteon tornatilis has occasionally been found in the holdfasts of Laminaria hyperborea from Beadnell, north-east England.


 Kingdom Animalia, Phylum Mollusca, Class Gastropoda, Order Cephalaspidea, Family Acteonidae, Genus Acteon.


  • Smithsonian
  • UB
  • IBRC