''Helicopsis filimargo'' 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 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 ...

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 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 ...

mollusc 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 esti ...

in the family

Geomitridae Geomitridae is a Taxonomy (biology), taxonomic Family (biology), family of small to medium-sized air-breathing land snails, Terrestrial molluscs, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea.MolluscaBase eds. (2021). M ...

MolluscaBase eds. (2022). MolluscaBase. * Helicopsis filimargo (Krynicki, 1833). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1002382 on 2022-08-01 from

Eastern Europe Eastern Europe is a subregion of the Europe, European continent. As a largely ambiguous term, it has a wide range of geopolitical, geographical, ethnic, cultural, and socio-economic connotations. The vast majority of the region is covered by Russ ...

Taxonomy

This species is extremely variable and many forms, especially from

Crimea Crimea, crh, Къырым, Qırım, grc, Κιμμερία / Ταυρική, translit=Kimmería / Taurikḗ ( ) is a peninsula in Ukraine, on the northern coast of the Black Sea, that has been occupied by Russia since 2014. It has a pop ...

, were treated as separate species before revision using methods of molecular taxonomy was carried. Synonyms of ''Helicopsis filimargo'' that were previously treated as species include (among many other): * ''Helicopsis arenosa'' (Krynicki, 1836), equal to ''Helicopsis dejecta'' (Rossmässler, 1838) * ''Helicopsis retowskii'' (Clessin, 1883) * ''Helicopsis gasprensis'' (Hesse, 1934), equal to ''Helicopsis paulhessei'' (Lindholm, 1936) * ''Helicopsis subfilimargo'' Gural-Sverlova, 2010 * ''Helicopsis martynovi'' Gural-Sverlova, 2010 * ''Helicopsis luganica'' Gural-Sverlova, 2010

Distribution

This species occurs in Southern and Eastern

Ukraine Ukraine ( uk, Україна, Ukraïna, ) is a country in Eastern Europe. It is the second-largest European country after Russia, which it borders to the east and northeast. Ukraine covers approximately . Prior to the ongoing Russian inv ...

and in the adjacent regions of

Russia Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the ...

. Most numerous and diverse populations are in the

Crimean Mountains The Crimean Mountains ( uk, Кримські гори, translit. ''Krymski hory''; russian: Крымские горы, translit. ''Krymskie gory''; crh, Qırım dağları) are a range of mountains running parallel to the south-eastern coast o ...

. All reports of ''H. filimargo'' outside those regions were referring to various other species of Geomitridae.

References

{{Commons category Geomitridae Molluscs described in 1833