''Vertigo dedecora'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

of very small 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 ...

, a terrestrial

pulmonate Pulmonata or pulmonates, is an informal group (previously an order, and before that a subclass) of snails and slugs characterized by the ability to breathe air, by virtue of having a pallial lung instead of a gill, or gills. The group includ ...

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 ...

micromollusk A micromollusk is a shelled mollusk which is extremely small, even at full adult size. The word is usually, but not exclusively, applied to marine mollusks, although in addition, numerous species of land snails and freshwater mollusks also ...

in the family Vertiginidae.Nekola J. C., Chiba S., Coles B.F., Drost C.A., Proschwitz T.V., Horsák M. 2018. A phylogenetic overview of the genus Vertigo O.F. Müller, 1773 (Gastropoda: Pulmonata: Pupillidae: Vertigininae) // Malacologia. Vol.62. No.1. P.21–161. This species is vulnerable. Was erroneously placed in genus ''

Ptychalaea ''Ptychalaea'' is a fossil genus of very small, air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Gastrocoptidae.Harzhauser M., Neubauer T.A., Georgopoulou E., Harl J. 2014The Early Miocene (Burdigalian) mollu ...

''.

Distribution

This species is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

References

* Molluscs of Japan Vertiginidae Taxonomy articles created by Polbot Taxobox binomials not recognized by IUCN {{Vertiginidae-stub