Aldisa banyulensis

Aldisa banyulensis (Pruvot-Fol, 1951)

Aldisa banyulensis by Enric Madrenas

Class: Gastropoda Cuvier, 1797
Subclass: Heterobranchia J.E. Gray, 1840
Clade: Euthyneura Spengel, 1881
Clade: Nudipleura Wägele & Willan, 2000
Order: Nudibranchia Cuvier, 1817
Suborder: Euctenidiacea Tardy, 1970
Infraorder: Doridacea Thiele, 1931
Superfamily: Doridoidea Rafinesque, 1815
Family: Cadlinidae Bergh, 1891
Genus: Aldisa Bergh, 1878
Species: Aldisa banyulensis Pruvot-Fol, 1951

The specimens of this species are about 15 mm long and are reddish with the central region of the dorsum slightly darker due to the internal organs. Most of the animals also have two oblique and somewhat whitish strips on each side of the body. Two small oval dark-red areas can be seen in the dorsum of the animal, one located between the two rhinophores and the other, with a pentagonal outline, located in front of the gill area. Both dark areas can be outlined by a thin whitish line. The back is covered with bumps. Some are large, with a cilindrical-conical shape, and are arranged more or less in circles, while the other are very small bumps, not visible to the naked eye, and located between the first. The rhinophores are small and reddish. The gill consists of 8 unipinnate branchial leaves colored reddish brown, somewhat darker than the back of the animal. The orifice of the branchial sheath has about 10 small rounded tubercules. In ventral view the mantle, colored light red, completely surrounds the foot and shows a fine reticula due to mantle spicules. The foot is bright red but, by transparency, shows some internal organs colored dark brown or whitish. The mouth lacks digitiform oral palps, but has two small globose bumps, one on each side of the mouth.

This species usually lives under rocks where encrusting sponges live, from very shallow depths. Some authors have cited the siliceous sponge Hemimycale columella as its food species. This species makes a spawn with few large (over 200 microns), red colored eggs. Another similar species, Aldisa smaragdina, has a similar coloration but has only 5 branchial leaves with a greenish colored rachis and its spawn has more eggs but of smaller size (130 microns), and it is associated with the sponge Phorbas fictitius.


  • Aldisa. Probably related to an Iceland viking saga of the same name.
  • Banyulensis. Related to the village of Banyuls sur Mer, in the French Languedoc, Roussillon, where there is an important oceanographic station.

Aldisa banyulensis is a species of mediterranean distribution. In the Iberian Peninsula has been cited in the Strait of Gibraltar, the coasts of eastern Andalusia, the southeast area, in Catalonia and the Balearic Islands. In some of these areas coexists with A. smaragdina, a species of Atlantic-Mediterranean distribution. In the Catalan coast it is found in different localities of the Costa Brava such as Llafranc and Es Caials (Cadaqués).

Known georeferenced records of the species: Aldisa banyulensis
: 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 Aldisa banyulensis based on our own records.

More pictures


Further reading

Cite this article as:

Ballesteros, Manuel, Enric Madrenas, Miquel Pontes (2012-2018) "Aldisa banyulensis" in OPK-Opistobranquis, Published: 16/05/2012, Accessed: 19/01/2018 at (

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