Elysia fezi Vilella, 1968
Elysia fezi according to the Vilella´s description by Pontes, Miquel
Taxonomy | Superdomain | Biota |
| Kingdom | Animalia |
| Phylum | Mollusca |
| Class | Gastropoda |
| Subclass | Heterobranchia |
| Infraclass | Euthyneura |
| Subterclass | Tectipleura |
| Superorder | Sacoglossa |
| Superfamily | Plakobranchoidea |
| Family | Plakobranchidae |
| Genus | Elysia |
| Species | Elysia fezi Vilella, 1968 |
| |
| Classification according to Bouchet et al. (2017) Taxonomic source: World Register of Marine Species (AphiaID: 494444). |
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.
Description
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.
Biology
The specimens used to describe this species were found living among seaweed Ulva lactuca, Cladophora prolifera–Enteromorpha linza, where the are perfectly camouflaged, in very shallow water (less than 1 meter). No details are known about their reproduction.
Etymology
- 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.
Distribution
Its distribution range is unknown. The type specimen was found on the beach in Cubelles (Barcelona, Spain).
Abundance
Western Mediterranean: | ★☆☆☆☆ |
Eastern Mediterranean: | ☆☆☆☆☆ |
Atlantic Ocean: | ☆☆☆☆☆ |
MonthThis chart displays the monthly observation probability for Elysia fezi based on our own records.
More pictures
Radular teeth and genitalia of Elysia fezi by Manuel Vilella (1968)
Bibliography
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Elysia fezi
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entomological-society-of-america
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Further reading
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