Costasiellidae is a taxonomic family of small to minute sacoglossan sea slugs. These are marine opisthobranch gastropod mollusks belonging to the superfamily Plakobranchoidea.Bouchet, P.; Gofas, S. (2015). Costasiellidae K. B. Clarke, 1984. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=23012 on 2015-01-17
These sea slugs resembling nudibranchs, but are not closely related to them.
This family has no subfamilies.
Genera The following genera belong to the family Costasiellidae: Costasiella Pruvot-Fol, 1951 Panderevela Moro & Ortea, 2015
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