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Janolus cristatus

delle Chiaje, 1841

Janolus

Classification
Identification
Biology
Distribution
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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

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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

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Distribution ${MSG_BIOLOGY_LISTE_CATEGORIES}$

Habitat