Lemmus

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Cladus: Synapsida
Cladus: Eupelycosauria
Cladus: Sphenacodontia
Cladus: Sphenacodontoidea
Cladus: Therapsida
Cladus: Theriodontia
Cladus: Cynodontia
Cladus: Eucynodontia
Cladus: Probainognathia
Cladus: Prozostrodontia
Cladus: Mammaliaformes
Classis: Mammalia
Subclassis: Trechnotheria
Infraclassis: Zatheria
Supercohors: Theria
Cohors: Eutheria
Infraclassis: Placentalia
Cladus: Boreoeutheria
Superordo: Euarchontoglires
Ordo: Rodentia
Subordo: Myomorpha
Superfamilia: Muroidea

Familia: Cricetidae
Subfamilia: Arvicolinae
Genus: Lemmus
Species: L. amurensis – L. lemmus – L. portenkoi – L. sheri – L. sibiricus – L. trimucronatus
Name

Lemmus (Link, 1795)

Type species: Mus lemmus Linnaeus, 1758
Synonyms

Brachyurus Fischer, 1813
Hypudaeus Illiger, 1811
Lemnus Gray, 1825
Lemmus Rochebrune, 1843
Mirus Brunner, 1938
Miromus Brunner, 1951

References

Abramson, N.I., 1993: A new species of lemming from the Eopleistocene of North East Siberia (Mammalia: Cricetidae). Zoosystematica Rossica 1(0): 156–160.
Lemmus in Mammal Species of the World.
Wilson, Don E. & Reeder, DeeAnn M. (Editors) 2005. Mammal Species of the World – A Taxonomic and Geographic Reference. Third edition. ISBN 0-8018-8221-4.

Vernacular names
English: True lemming
magyar: Lemming

The genus Lemmus contains several species of lemming sometimes referred to as the true lemmings. They are distributed throughout the Holarctic, particularly in the Palearctic.
Description

Head and body is 10-13.5 cm, and tail length is 18–26 mm. Weight ranges from 40-112 g. They are grey or brown. Unlike the collared lemmings, their coats do not change color in winter. They stay brown and grey.
Natural history

These lemmings are found predominantly in tundra or high elevations. Populations can fluctuate widely and mass migrations do take place. This mass migration is probably the source of the myth that lemmings commit mass suicide. These intense population booms appear to be most common in the northern part of its range (such as Lapland).

Gestation is 16–23 days. Litters are 1-13 (7 average). Young are sexually mature after 14 days. When conditions are favorable, these demographic parameters allow for a veritable explosion in population size.
Species

Amur lemming - (Lemmus amurensis)
Norway lemming - (Lemmus lemmus)
Beringian lemming - (Lemmus nigripes)
East Siberian lemming - (Lemmus paulus)
West Siberian lemming - (Lemmus sibiricus)
Canadian lemming - (Lemmus trimucronatus)

References

Krystufek, B. (2019). "Back to the future: the proper name for red-backed voles is Clethrionomys Tilesius and not Myodes Pallas". Mammalia. 84 (2). doi:10.1515/mammalia-2019-0067.

Duff, A. and A. Lawson. 2004. Mammals of the World A Checklist. New Haven, Yale University Press.
Musser, G. G. and M. D. Carleton. 2005. Superfamily Muroidea. pp. 894–1531 in Mammal Species of the World a Taxonomic and Geographic Reference. D. E. Wilson and D. M. Reeder eds. Johns Hopkins University Press, Baltimore.
Nowak, R. M. 1999. Walker's Mammals of the World, Vol. 2. Johns Hopkins University Press, London.