The Clausilioidea are a

superfamily SUPERFAMILY is a database and search platform of structural and functional annotation for all proteins and genomes. It classifies amino acid sequences into known structural domains, especially into SCOP superfamilies. Domains are functional, str ...

of air-breathing

land snail A land snail is any of the numerous species of snail that live on land, as opposed to the sea snails and freshwater snails. ''Land snail'' is the common name for terrestrial gastropod mollusks that have shells (those without shells are known as ...

s and

slug Slug, or land slug, is a common name for any apparently shell-less terrestrial gastropod mollusc. The word ''slug'' is also often used as part of the common name of any gastropod mollusc that has no shell, a very reduced shell, or only a smal ...

terrestrial Terrestrial refers to things related to land or the planet Earth. Terrestrial may also refer to: * Terrestrial animal, an animal that lives on land opposed to living in water, or sometimes an animal that lives on or near the ground, as opposed to ...

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...

s in the informal group

Sigmurethra Sigmurethra is a taxonomic category of air-breathing land snails and slugs, terrestrial pulmonate gastropod molluscs. This is an informal group which includes most land snails and slugs. The two strong synapomorphies of Sigmurethra are a ...

. This classification was based on different studies dealing with the Clausiliidae, published by H. Nordsieck in 1978, 1979, 1981, 1985, 1994, 1997 and 1998.

Taxonomy

*Family

Clausiliidae Clausiliidae, also known by their common name the door snails, are a taxonomic family of small, very elongate, mostly left-handed, air-breathing land snails, sinistral terrestrial pulmonate gastropod mollusks.MolluscaBase eds. (2020). MolluscaBa ...

Gray, 1855 * † Family Anadromidae Wenz, 1940 * † Family Filholiidae Wenz, 1923 * † Family Palaeostoidae H. Nordsieck, 1986

References

* Gray, J. E. (1855). ''Catalogue of Pulmonata or air-breathing Mollusca in the collection of the British Museum, Part I.'' Taylor & Francis, London. 192 pp. Stylommatophora Gastropod superfamilies {{Stylommatophora-stub