Jorunna onubensis

Jorunna onubensis Cervera, García & García-Gómez, 1986

Jorunna onubensis by José Carlos García Gómez

Taxonomy
 

Superdomain

Biota  

 

Kingdom

Animalia  

 

Phylum

Mollusca  

 

Class

Gastropoda  

 

Subclass

Heterobranchia  

 

Infraclass

Euthyneura  

 

Subterclass

Ringipleura  

 

Superorder

Nudipleura  

 

Order

Nudibranchia  

 

Suborder

Doridina  

 

Infraorder

Doridoidei  

 

Superfamily

Doridoidea  

 

Family

Discodorididae  

 

Genus

Jorunna  

 

Species

Jorunna onubensis  Cervera, Garcia-Gomez & Garcia, 1986

 
 Classification according to Bouchet et al. (2017)
Taxonomic source: World Register of Marine Species (AphiaID: 140165).
Description
Oval shaped body, with a convex profile, usually measures between 15 and 20mm in length, with a maximum recorded length of 55mm (Sánchez Tocino, accessed February 2018). It is light brown coloured, sometimes pinkish or grayish, sometimes with dark spots of variable size, coloured gray or grayish brown, distributed around the back, which has opaque white small spots all along the margin. The mantle is covered with thick caryophilic tubercles, each surrounded by 6-7 spicules whose ends generally exceed the upper part of the tubercles, although sometimes they remain at the same level or below. Some dorsal tubercles have an iridescent white tip. The oral palps are short. The whitish rhinophores have 15 lamellae that, in some specimens, have a dark brown band in the subapical zone. The base of the rhinophores below the lamellae is transparent. The gills consist of 9 to 10 whitish bipinnate blades, finely dotted in brown, hardly distinguishable to the naked eye. They are arranged so that they surround the anal papilla, which is brown in color, with white striae that divide it into unequal parts. The gills are surrounded by a collar-shaped sheath that closes over the gills when they retract. The foot has a lighter tone than the general colouration of the body and it has a fissure in the front area, while the rounded rear area slightly exceeds the edge of the mantle.

Biology
The spawn is a cord of about 3mm high, rolled into a spiral of one and a half turns, with irregularly arranged spherical or somewhat pyriform capsules of 90-150 microns in diameter. Each capsule contains a single egg of 40-110 microns in diameter, somewhat oval and whitish-yellowish in color. It differs from Jorunna tomentosa by the presence of 5-6 typical dorsal spots of that species, absent in J. onubensis. Also the edges of the mantle of J.onubensis are much narrower. The relation between the length and the width relative to the caryophilic tubercles is at least twice that in J. tomentosa. There are other differences at the internal anatomical level that can not be observed with the naked eye.

Etymology

  • Jorunna. Possibly dedicated to Jorunn Bjarnadottir, a character of an Icelandic viking saga, wife of Ólafr Höskuldsson (c. 938–1006)nicknamed “the Peacock” because of his proud bearing and magnificent wardrobe.
  • Onubensis. Native or inhabitant of the ancient Roman city of Onuba, currently Huelva (Spain).

Distribution
Originally described in Huelva (Spain) on four specimens found in the intertidal, it has also been reported in Cadaqués, Granada and Gran Canaria (Spain) and in Peniche, Sagres and Madeira (Portugal).

Known georeferenced records of the species: Jorunna onubensis
Sources:
: OBIS
: GROC 2010-2011
: Enric Madrenas
: João Pedro Silva
: Bernard Picton
: GBIF.ORG
: OPK
: VIMAR
: Manuel Ballesteros.
: M@re Nostrum
: Altres fonts
: Marine Regions

References for the species: Jorunna onubensis

    Portugal: Malaquias and Morenito (2000). Andalucía (Atl.): Cervera, García-Gómez and García (1986), Cervera (unpubl. data). Andalucía (Med.): Templado, Luque and Moreno (1988), Sánchez Tocino, Ocaña and García (2000a), Ocaña et al. (2000), Wirtz and Debelius (2003). Canarias: Ortea et al. (2001), Moro et al. (2003), Wirtz and Debelius (2003). Madeira: Wirtz (1999).

    General: Perrone, 1990b:25; Templado, Luque, & Moreno, 1988:18

    Sources: Cervera et al., 2004, Ballesteros, 2007 & 2016, McDonald, 2006 and other sources.

Abundance

    Western Mediterranean:
    Eastern Mediterranean:
    Atlantic Ocean:

More pictures

Bibliography

Further reading

Cite this article as:

Pontes, Miquel, Manuel Ballesteros, Enric Madrenas (2012-2018) "Jorunna onubensis" in OPK-Opistobranquis, Published: 05/10/2013, Accessed: 22/06/2018 at (https://opistobranquis.info/en/3trV6)

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