Wikipedia
Nacellidae
Nacellidae is a taxonomic family of sea snails or true limpets, marine gastropod molluscs in the clade Patellogastropoda.
Nacellidae was the only family in the superfamily Nacelloidea. The family is listed in its own superfamily Nacelloidea by Bouchet & Rocroi (2005) but should be included in the Lottioidea following Nakano & Ozawa (2007)