Runcina avellana

Runcina avellana  Schmekel & Cappellato, 2001

Sinònims

• Pseudoilbia avellana Schmekel & Cappellato, 2001

Descripció
Aquesta espècie mesura al voltant de 2 mm de longitud i té el cos clarament allargat. El notum anterior és una mica més estret que el peu i no diferencia lòbuls cefàlics mentre que l’extrem posterior és de contorn ovalat. El peu és de la mateixa amplada que el notum excepte pel davant, on sobresurt lleugerament pels costats de la regió cefàlica, i per darrere, on forma una cua curta i arrodonida. La coloració és marró xocolata uniforme excepte les regions anterior i lateral del cap, algunes zones de la vora del notum, el peu i la cua, que són més clars i semitransparents. Els ulls són clarament visibles i estan situats a prop de la vora lateral de la regió cefàlica, a la zona més clara. La vora del peu té petites taques marrons en tota la seva longitud i la cua presenta una taca més gran del mateix color, en forma d'”Y” invertida. Schmekel & Capellato (2001) citen que els seus exemplars tenien un sol full branquial de forma arrodonida.

Biologia
D’aquesta espècie tan poc coneguda se sap que viu en els rizomes de Posidonia oceanica, com altres espècies del mateix gènere, i que també ha aparegut entre masses d’algues com Codium vermilara (E. Madrenas, comunicació personal).

Etimologia

• Runcina. Del Llatí “runcina”, ribot de fuster, útil que es fa servir per allisar la superficie de la fusta.
• Avellana. Està relacionat amb la ciutat d’Avellino (Campania, Itàlia) que durant la dominació romana s’anomenava “Abella” i que era coneguda pels seus camps d’avellaners, el fruit dels quals era conegut en Llatí com “avellana nux”, nou d’Abella. El fruit de l’avellaner era també conegut en castellà antic com “avellina”. Fa referència al color marró xocolata del cos d’aquest opistobranqui, similar al de l’avellana.

Distribució
Fins ara, R. avellana només era coneguda de la localitat de Banyuls-sur-Mer, a les costes franceses de la Mediterrània occidental, gràcies a la recol·lecció de 3 exemplars vius de 1, 1,2 i 1,5 mm de longitud. L’aparició d’un exemplar entre algues a les Illes Medes (Costa Brava de Catalunya) significa la segona cita de l’espècie a nivell global, seguit d’unes quantes mostres més obtingudes pel nostre grup a la Badia de Roses i que es van utilitzar en l’estudi d’Araujo et al (2022).

Cites georeferenciades conegudes de l'espècie: Runcina avellana

Fonts:
OBIS GROC 2010-2011 Enric Madrenas João Pedro Silva Bernard Picton GBIF	OPK VIMAR Manuel Ballesteros M@re Nostrum Altres fonts Marine Regions

Altres fotos

Runcina avellana by Enric Madrenas

Runcina avellana by Enric Madrenas

Runcina avellana @ Es Caials, Cadaqués, Spain by Enric Madrenas

Runcina avellana by Enric Madrenas

Runcina avellana by Enric Madrenas

Runcina avellana @ Caleta (Palamós, Spain) by Enric Madrenas

Runcina avellana @ Caleta (Palamós, Spain) by Enric Madrenas

Bibliografia

1246567 Runcina avellana 1 eunomia-revista-en-cultura-de-la-legalidad 50 creator asc 1 2310 https://opistobranquis.info/wp-content/plugins/zotpress/
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Schmekel, L., Cappellato, D. (2001). Contributions to the Runcinidae. I. Six new species of the genus Runcina (Opisthobranchia cephalaspidea) in the Mediterranean. Vie Et Milieu-Life and Environment, 51(3), 141-160.
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Bibliografia basada en els treballs de Steve Long, 2006. Bibliography of Opisthobranchia 1554-2000 i Gary McDonald, 2009. Bibliographia Nudibranchia, amb actualitzacions posteriors procedents d´altres fonts.

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