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Janolus cristatus

delle Chiaje, 1841

Janolus

Classification
Identification
Biology
Distribution
Links
Bibliography

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Classification   {MSG_BIOLOGY_LISTE_CATEGORIES}
Latin name : Janolus cristatus (delle Chiaje, 1841)
Synonyms :
Classification : Nudibranchia [ Cuvier, 1817 ] ( Sea slugs )
 
Name : Antiopelle
Name : Janolus
Identification   {MSG_BIOLOGY_LISTE_CATEGORIES}
Main identification characters
A semi-transparent nudibranch with numerous swollen cerata, each with a thin dark thread of digestive gland running through the centre. The tips of the cerata are coloured with an iridescent bluish-white pigment, and similar pigment patches are found on the back, between the cerata and in the head region.

The rhinophores have lamellae set at an angle, giving the appearance of spiral grooves. Between them is a cockscomb-like structure called a caruncle which is unique to Janolus species.

A large species, growing to at least 75mm.
Possible confusions
Feel free to update this datasheet and complete this data.
Biology   {MSG_BIOLOGY_LISTE_CATEGORIES}
Feed
It feeds on erect Bryozoans, especially Bugula species.
Cycle of life / Reproduction
The spawn consists of a white or pale pink string wound in a wavy circle pattern, usually on the food. The eggs are in packets with clear patches between them, giving a beaded appearance to the spawn.
Interaction with other species
Feel free to update this datasheet and complete this data.
Distribution   {MSG_BIOLOGY_LISTE_CATEGORIES}
Habitat

Rocks
Found in shallow sublittoral conditions, especially on sheltered rockfaces.
Geographical distribution
Northeastern Atlantic from Norway to Morocco, and western Mediterranean.
Links   {MSG_BIOLOGY_LISTE_CATEGORIES}
Websites :
http://michel.barrabes.free.fr/pages_util/espece.php?id=39
http://perso.wanadoo.fr/christian.coudre/antiopelle.html
http://staff.umh.ac.be/Sheridan.Richard/inventaire/mol/htm/janolus.htm
http://www.medslugs.de/E/taxonomy/Janolus_cristatus.htm
http://www.pictonb.freeserve.co.uk/nudibranchs/jancri.html
http://www.seaslugforum.net/janocris.htm

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Bibliography   {MSG_BIOLOGY_LISTE_CATEGORIES}
N/A
Data sheet written by Christophe Naslain , 2/06/2003

Updates :
Christophe Naslain - 02/06/2003
Nicolas Thiercelin - 12/07/2003


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