Cerionidae

Cerionidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Urocoptoidea.^[3]

Cerionidae
Cerion chrysalis
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Superfamily:	Urocoptoidea
Family:	Cerionidae Pilsbry, 1901[1]
Diversity[2]
about 600 nominal species

Pre-2008 taxonomy

According to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005),^[4] the family Cerionidae is classified in the superfamily Orthalicoidea, within the informal group Sigmurethra, itself belonging to the clade Stylommatophora within the clade Eupulmonata. The family Cerionidae has no subfamilies.^[4]

2008 taxonomy

Uit de Weerd (2008)^[3] moved the Cerionidae to the newly established superfamily Urocoptoidea based on molecular phylogeny research.^[3]

Fossil record

The oldest fossil cerionid is C. acherontis from the Upper Cretaceous Hell Creek Formation, in Montana, northwestern USA.^[5] The second oldest record is the genus Brasilennea from the Brazilian Paleocene Itaboraí Basin, in Rio de Janeiro.^[6]

Genera

Genera within the Cerionidae include:

• †Brasilennea Maury, 1935^[7]
• Cerion Röding, 1798 - the type genus of the family Cerionidae^[4]
• Mexistrophia Thompson, 2011^[8]