Placida dakariensis

Placida dakariensis (Pruvot-Fol, 1953)

• Hermaea dakariensis Pruvot-Fol, 1953

Descripció
Cos blanc translúcid amb les ramificacions de l’hepatopàncrees de color verd pàl·lid, sense la pigmentació vermellosa superficial d’altres espècies similars. Presenta grànuls de color blanc opac al terç distal de rinòfors i cerata, així com a l’àrea cardíaca. Disposa d’uns 20 cerata molt allargats a cada costat del cos, distribuïts en fileres de 3 altures, formant una banda lateral. Els cerata més llargs són els situats més a prop de la línia mitjana del cos. La glàndula digestiva es ramifica pel dors i rinòfors, penetrant als cerata sense ramificar-se. Alguns exemplars tenen taques de color verd negrós a la cara interna dels cerata i al dors. A l’àrea cardíaca no s’observen ramificacions de la glàndula digestiva. L’anus està situat en un peduncle ample i curt per davant de l’àrea cardíaca, mentre que el gonopor està ubicat una mica per darrere i per sota de l’ull dret. Els rinòfors són cilindrocònics, llargs i estrets, i no estan auriculats. La vora anterior del peu està eixamplada i lleugerament bilobulada, amb la sola de color blanc, encara que permet veure per transparència el sistema digestiu ramificat intern (hepatopàncrees) quan és ple.

Biologia
Els exemplars recol·lectats van ser trobats sobre algues verdes del gènere Bryopsis Lamouroux, 1809, dels quals se suposa que s’alimenta. No es coneixen detalls de la reproducció. En moure’s porta els cerata en diagonal amb el cos i de vegades creua els més llargs per sobre del dors.

Espècies semblants

• Placida viridis, pel fet que la glàndula digestiva de l’interior de las seves cerata no es ramifica, però P. dakariensis no presenta pigmentació vermellosa al cos, ni les dues bandes vermelles a la sola del peu, característiques de P. viridis. Els rinòfors són de diferent morfologia.
• Placida dendritica i Placida verticillata, de coloració molt semblant, però en totes dues la glàndula digestiva de l’interior dels cerata es ramifica, cosa que no passa a P.dakariensis. La morfologia radular és també diferent i permeten diferenciar-les fàcilment. La dent radular és característica en P.dakariensis i permet distingir-la dels altres membres de la família.

Etimologia

• Placida. Del Llatí “placeō”, satisfer. També significa plàcida, suau, tranquil·la, quieta, pacífica.
• Dakariensis. Indica amb la localitat on va ser descrita per primer cop (Dakar, Senegal).

Distribució
La seva àrea de distribució coneguda compren, de moment, les illes Canàries i les costes de Senegal.

Cites georeferenciades conegudes de l'espècie: Placida dakariensis

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

Placida dakariensis (cerata & radular teeth) by Pruvot-Fol (1953)

Placida dakariensis by Ortea et al (2006)

Placida dakariensis @ Gran Canaria by Mario Matute

Placida dakariensis @ Gran Canaria by Mario Matute

Bibliografia

1246567 Placida dakariensis 1 eunomia-revista-en-cultura-de-la-legalidad 50 creator asc 1 45947 https://opistobranquis.info/wp-content/plugins/zotpress/
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Caballer, M. (2007). Catálogo de los sacoglosos y opistobranquios (Mollusca: Gastropoda) de sustrato rocoso de la Bahía de Santander. Revisión de los géneros con especies cripticas. University of Cantabria
Caballer, M., Ortea, J., Moro, L. (2006). Redescripción y reubicación genérica de Hermaea dakariensis Pruvot-Fol, 1953 (Mollusca, Sacoglossa) a partir de ejemplares de las islas Canarias. Vieraea, 34, 59-63.
Jensen, K. R. (2007). Biogeography of the Sacoglossa (Mollusca, Opisthobranchia). Bonner Zoologische Beiträge, 55(3-4), 255-281.
Ortea, J., Moro, L., Bacallado, J. J., Caballer, M. (2013). Sucinto análisis histórico sobre el estudio e investigación de las babosas marinas (moluscos opistobranquios y sacoglossos) de Canarias y su entorno. Revista de la Academia Canaria de las Ciencias, 25, 221-235.
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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