Costasiellidae
Costasiellidae is a taxonomic family of small to minute sacoglossan sea slugs. These are marine opisthobranch gastropod mollusks belonging to the superfamily Plakobranchoidea.[1] These sea slugs resembling nudibranchs, but are not closely related to them. This family has no subfamilies. GeneraThe following genera belong to the family Costasiellidae:
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