Elysia fezi

Elysia fezi  Vilella, 1968

Elysia fezi according to the Vilella´s description by Miquel Pontes

Class: Gastropoda  Cuvier, 1797
Subclass: Heterobranchia  J.E. Gray, 1840
Clade: Euthyneura  Spengel, 1881
Clade: Panpulmonata  Jörger et al., 2010
Clade: Sacoglossa  von Ihering, 1876
Subclade: Plakobranchacea  Jensen, 1996
Superfamily: Plakobranchoidea  J.E. Gray, 1840
Family: Plakobranchidae  J.E. Gray, 1840
Genus: Elysia  Risso, 1818
Species: Elysia fezi  Vilella, 1968

Taxonomic note: Elysia fezi  Vilella, 1968 is considered taxon inquirendum at WoRMS (2016), because it has not been collected nor observed since the original description. The big size (44 mm of length) of the biggest specimen studied by Vilella (1968) and other anatomical and coloration details allow to think this is a taxonomically valid species but, despite the type location (Cubelles, Barcelona, Spain) has been sampled for decades, no other specimens have been found.

This species is characterized by an elongated body, with a maximum length of about 44mm. The cephalic end and the rear end are obtuse, the last one slightly narrower. In the middle of the cephalic region are the eyes, that appear surrounded by a turquoise ring; body coloration is bright green, while the dorsum and the base of the foot, which is very narrow, are white. The rhinophores are auriculate, thick, with a truncated apex, and about 6 mm in length. Parapodia originate at about 11 mm. from the mouth, are wider at the origin and extend gently to the rear end of the foot; the inner edge of the parapodia presents a thin green line, while the outer edge has a series of spots coloured dark green, almost black, and arranged irregularly. The genital openings are on the right side of the body, behind the head, separated from each other, the male orifice closer to the front end.

The specimens used to describe this species were found living among seaweed Ulva lactuca, Cladophora proliferaEnteromorpha linza, where the are perfectly camouflaged, in very shallow water (less than 1 meter). No details are known about their reproduction.


  • Elysia. It is a girl’s name of Latin origin, derived from the word Elysium, which in mythology is the home of the blessed, known as the “Elysian fields”. The name Elysia also means “God’s oath” in Hebrew. Frieder Sauer comments that Elysia means heavenly.
  • Fezi. Dedicated to the late Dr. Siro de Fez Sánchez (1887-1967) Spanish malacologyst living in Valencia, author of one of the first works about saccoglossans and nudibrachs of the Iberian shores.

Its distribution range is unknown. The type specimen was found on the beach in Cubelles (Barcelona, Spain).

Known georeferenced records of the species: Elysia fezi
: GROC 2010-2011
: Enric Madrenas
: João Pedro Silva
: Bernard Picton
: Manuel Ballesteros.
: M@re Nostrum
: Altres fonts
: Marine Regions


    Western Mediterranean:
    Eastern Mediterranean:
    Atlantic Ocean:
This chart displays the observation probability for Elysia fezi based on our own records.

More pictures


Further reading

Cite this article as:

Ballesteros, Manuel, Enric Madrenas, Miquel Pontes et al. (2012-2017) "Elysia fezi" in OPK-Opistobranquis, Published: 24/11/2015, Accessed: 18/12/2017 at (https://opistobranquis.info/en/6rsDW)

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