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Janolus

Janolus is a genus of small to large sea slugs, or more accurately nudibranchs, marine gastropod mollusks, in the family Proctonotidae.[1]

The name Janolus is derived from the two-headed god Janus, in ancient Roman mythology.

Although these nudibranchs superficially resemble aeolid nudibranchs, this genus is in fact in the suborder Arminina.

Description[edit]

Adult individuals of Janolus species can be between 2.5 cm to 8 cm long, depending on the species. They are semi-translucent and the body is covered in short cerata.

The color of the cerata varies according to the species: in Janolus fuscus the cerata are orange and white tipped, whereas in Janolus barbarensis they are orange and blue tipped.

Distribution[edit]

Janolus species are found in many areas world-wide, including Europe, Australia, Japan and Africa.

The species Janolus fuscus is found from the Kenai Peninsula, Alaska to central California and also in northern Japan.[2]

Ecology[edit]

Habitat[edit]

This genus of nudibranch is found in shallow and subtidal waters.

Feeding habits[edit]

Janolus species feed on Bryozoa, moss animals.

Predators[edit]

In California, Navanax is a known predator of Janolus. Navanax tracks the slime of Janolus by using chemoreceptors. When Janolus is about to be caught, it rolls into a ball, leaving its cerata exposed.

Species[edit]

Species in the genus Janolus include:[3][4]

Species brought into synonymy

References[edit]

  1. ^ a b Bouchet, P.; Gofas, S. (2012). Janolus Bergh, 1884. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138379 on 2012-06-03
  2. ^ "Janolus fuscus". Sea Slug Forum. Retrieved 24 December 2006. 
  3. ^ "Janolus". Integrated Taxonomic Information System. 
  4. ^ Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1
  • Vaught, K.C. (1989). A classification of the living Mollusca. American Malacologists: Melbourne, FL (USA). ISBN 0-915826-22-4. XII, 195 pp.
  • Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 180–213

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