''Allognathus'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...

of air-breathing land snails,

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 ...

pulmonate gastropod

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 es ...

s in the family

Helicidae Helicidae is a large, diverse family of small to large, air-breathing land snails, sometimes called the "typical snails." A number of species in this family are valued as food items, including ''Cornu aspersum'' (formerly ''Helix aspersa'') the ...

, the true snails. The genus is endemic to the Balearic Islands (

Western Mediterranean The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Western and Southern Europe and Anatolia, on the south by North Africa, and on the eas ...

) being present in all major islands and in several small islets. The genus colonized the archipelago from the south-eastern

Iberian Peninsula The Iberian Peninsula (), ** * Aragonese and Occitan: ''Peninsula Iberica'' ** ** * french: Péninsule Ibérique * mwl, Península Eibérica * eu, Iberiar penintsula also known as Iberia, is a peninsula in southwestern Europe, defi ...

during the Middle Miocene, throughout a land-bridge connection. The different species belonging to ''Allognathus'' live in crevice rocks or under stones. For some authors, ''Allognathus'' include two subgenus, ''Allognathus s. str.'', that is monospecific, and ''Iberellus'' Hesse 1908, that includes at least two species.

Species

Species within the genus ''Allognathus'' include: *''

Allognathus campanyonii ''Allognathus campanyonii'' is a species of land snail in the family Helicidae, the true snails.MolluscaBase (2018). Allognathus campanyonii (Rossmässler, 1839). Accessed through: World Register of Marine Species at: http://www.marinespecies.or ...

'' (Rossmässler, 1839) *''

Allognathus graellsianus ''Allognathus graellsianus'' is a species of land snail in the family Helicidae, the true snails. It is endemic to Mallorca, one of Spain's Balearic Islands. This taxa is the type species of the genus ''Allognathus''. The snail lives in cracks ...

'' (Pfeiffer, 1848) -

type species In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specimen( ...

*''

Allognathus hispanicus ''Allognathus hispanicus'' (now known as ''Allognathus balearicus'') is a species of land snail in the family Helicidae, the true snails. This species is endemic to Mallorca, one of Spain's Balearic Islands. The common name is "''caragol de Serp ...

'' (Rossmässler, 1838)

References

* Bank, R. (2017). Classification of the Recent terrestrial Gastropoda of the World. Last update: July 16, 2017 Helicidae Gastropod genera Taxonomy articles created by Polbot {{Helicidae-stub