Runcina avellana

Runcina avellana  Schmekel & Cappellato, 2001

Sinónimos

• Pseudoilbia avellana Schmekel & Cappellato, 2001

Descripción
Esta especie mide alrededor de 2 mm de longitud y tiene el cuerpo claramente alargado.  El nótum anterior es algo más estrecho que el pie y no diferencia lóbulos cefálicos mientras que  el extremo posterior es de contorno ovalado. El pie es de la misma anchura que el nótum excepto por delante, donde sobresale  ligeramente por los lados de la región cefálica, y por detrás, donde forma una cola corta y redondeada. La coloración es  marrón chocolate uniforme excepto las regiones anterior y lateral de la cabeza, algunas zonas del borde del nótum, el pie y la cola, que son más claros y semitransparentes. Los ojos son claramente visibles y están situados cerca del borde lateral de la región cefálica, en la zona más clara. El borde del pie tiene pequeñas manchas marrones en toda su longitud y la cola presenta una mancha más grande del mismo color, en forma de “Y” invertida. Schmekel & Capellato (2001) citan que sus ejemplares tenían una sola hoja branquial de forma redondeada.

Biología
De esta especie tan poco conocida se sabe que vive en rizomas de Posidonia oceanica, como otras especies del mismo género, y que también ha aparecido entre masas de algas como Codium vermilara (E. Madrenas, comunicación personal).

Etimología

• Runcina. Del Latín “runcina”, cepillo de carpintero, útil que se emplea para alisar la superficie de la madera.
• Avellana. Está relacionada con la ciudad de Avellino (Campania, Italia) que durante la dominación romana se llamaba “Abella” y que era conocida por sus avellanedos, cuyo fruto era llamado en Latín “avellana nux”, nuez de Abella. El fruto del avellano también era conocido en castellano antiguo como “avellina”. Hace referencia al color marrón chocolate del cuerpo de este opistobranquio, similar al de la avellana.

Distribución
Hasta la fecha, R. avellana sólo era conocida de la localidad de Banyuls-sur-mer, en las costas francesas del Mediterráneo occidental, gracias a la recolección de 3 ejemplares de 1, 1,2 y 1,5 mm de longitud en vivo. La aparición de un ejemplar entre algas en las Islas Medas (Costa Brava de Cataluña) significa la segunda cita de la especie a nivel global, seguidas de algunas muestras más obtenidas por nuestro grupo en la Bahía de Roses (España) y que se utilizaron en el estudio de Araujo et al (2022).

Citas georeferenciadas conocidas de la especie: 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

Otras 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

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.
Templado, J., Villanueva, R. (2010). Checklist of Phylum Mollusca. pp. 148-198 In Coll, M., et al., 2010. The biodiversity of the Mediterranean Sea: estimates, patterns, and threats. PLoS ONE 5(8):36pp.
WoRMS Editorial Board. (2026). World Register of Marine Species. WoRMS. Disponible en: http://www.marinespecies.org
Bibliografía basada en los trabajos de Steve Long, 2006. Bibliography of Opisthobranchia 1554-2000 y Gary McDonald, 2009. Bibliographia Nudibranchia, con actualizaciones posteriores procedentes de otras fuentes.

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