Fiona pinnata on floating debris with Lepas sp.
Fiona pinnata
Fiona pinnata
Detail of cerata with sail-like extension and without cnidosacs.
Fiona pinnata is a small nudibranch found exclusively on floating objects (wood or plastics) inhabited by goose barnacles (Lepas sp.). It is an unusual nudibranch both in its ecological niche selection and its anatomy.

Propodial tentacles: Absent, (foot rounded).
Oral tentacles: 2 in number, medium, white.
Rhinophores: White, smooth.
Cerata: Brownish coloured, without white tips (Cnidosacs absent).
Body: White, with hints of orange brown on dorsum and blotches between the rhinophores.
Foot: White without appendages.

Size range: 4-16mm. Common in its niche.

Specific characteristics: This species is easily identified in the field. It is always found on floating debris with Lepas sp., the colour of the ceras is a drab brown to dark brown without cnidosacs and the sail-like projections on the cerata, which are unique to this species.

Identification by Dr. A. Perrone
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Qalet Marku on floating debris, 0m depth 15/03/93
Marine species
Fiona pinnata (Eschscholtz, 1831)
Sail-like processes on cerata
Note absence of cnidosacs (present as a white
tip on aeolids)
Qalet Marku 0m depth 15/03/93
Qalet Marku 0m depth 15/03/93