Cratena peregrina
Cratena peregrina in its natural habitat
Anterior part
Cratena peregrina
Lateral view
Ventral view
Propodial tentacles
Cratena peregrina (Gmelin, 1791)
Cratena peregrina is a medium sized aeolid nudibranch often found roaming on hydroids (Eudendrium sp.) in areas with constant water currents. It is a common species and easily seen in the field, its bright colours giving it away. It is often accompanied with Flabellina affinis, with which it may compete for food.

Propodial tentacles: Present, white in colour.
Oral tentacles: 2 in number, very long, tapering and recurved (like elephant tusks), white in colour.
Rhinophores: Long, smooth, almost transparent base with bright yellow to orange pigment at the upper area.
Cerata: Very long and thin, bright red with a purplish subterminal ring and a white tip.
Body: Aeoliid like, base colour is white with two characteristic bright yellow spots in the area between the oral tentacles and rhinophores.
Foot: White in colour without appendages.

Size range: 15-42mm. Common.

Specific characteristics: This species is easily identified in the field by the bright red cerata, yellow tipped rhinophores and the two yellow rectangular spots on the anterior dorsal area.

Identified by Dr. A Perrone.
40mm Mercanti reef 5-9m depth 9/07/92
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Marine species - video; text in Spanish
Ventral view
Lateral view of 40mm specimen
Cratena peregrina in its natural habitat
Detail of anterior area showing characteristic
yellow spots
Propodial tentacles, oral tentacles and rhinophores
40mm Mercanti reef 5-9m depth 9/07/92