Arvicolinae Temporal range: Late Miocene – recent | |
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Meadow vole (Microtus pennsylvanicus) | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Rodentia |
Family: | Cricetidae |
Subfamily: | Arvicolinae Gray, 1821 |
Genera | |
see text |
The Arvicolinae are a subfamily of rodents that includes the voles, lemmings, and muskrats. They are most closely related to the other subfamilies in the Cricetidae (comprising the hamsters and New World rats and mice [1] ). Some authorities place the subfamily Arvicolinae in the family Muridae along with all other members of the superfamily Muroidea. [2] Some refer to the subfamily as the Microtinae (yielding the adjective "microtine") [3] or rank the taxon as a full family, the Arvicolidae. [4]
The Arvicolinae are the most populous group of Rodentia in the Northern Hemisphere. They often are found in fossil occlusions of bones cached by past predators such as owls and other birds of prey. Fossils of this group are often used for biostratigraphic dating of paleontological and archeological sites in North America and Europe. [5]
The most convenient distinguishing feature of the Arvicolinae is the nature of their molar teeth, which have prismatic cusps in the shape of alternating triangles. These molars are an adaptation to a herbivorous diet in which the major food plants include a large proportion of abrasive materials such as phytoliths; the teeth get worn down by abrasion throughout the adult life of the animal and they grow continuously in compensation. [6]
Arvicolinae are Holarctic in distribution and represent one of only a few major muroid radiations to reach the New World via Beringia. (The others are the three subfamilies of New World rats and mice.) Arvicolines do very well in the subnival zone beneath the winter snowpack, and persist throughout winter without needing to hibernate. They are also characterized by extreme fluctuations in population numbers.
Most arvicolines are small, furry, short-tailed voles or lemmings, but some, such as Ellobius and Hyperacrius , are well adapted to a fossorial lifestyle. Others, such as Ondatra , Neofiber , and Arvicola , have evolved larger body sizes and are associated with an aquatic lifestyle.
The phylogeny of the Arvicolinae has been studied using morphological and molecular characters. Markers for the molecular phylogeny of arvicolines included the mitochondrial DNA cytochrome b (cyb) gene [7] and the exon 10 of the growth hormone receptor (ghr) nuclear gene. [8] The comparison of the cyb and ghr phylogenetic results seems to indicate nuclear genes are useful for resolving relationships of recently evolved animals. As compared to mitochondrial genes, nuclear genes display several informative sites in third codon positions that evolve rapidly enough to accumulate synapomorphies, but slow enough to avoid evolutionary noise. Of note, mitochondrial pseudogenes translocated within the nuclear genome complicate the assessment of the mitochondrial DNA orthology, but they can also be used as phylogenetic markers. [9] Sequencing complete mitochondrial genomes of voles [10] may help to distinguish between authentic genes and pseudogenes.
The complementary phylogenetic analysis of morphological and molecular characters [8] [11] suggests:
Some authorities have placed the zokors within the Arvicolinae, but they have been shown [ by whom? ] to be unrelated.
A 2021 study found Lemmini to be the most basal group of Arvicolinae. The study also found Arvicola to actually fall outside the tribe Arvicolini, and to be sister to the tribe Lagurini. [12]
Subfamily Arvicolinae - voles, lemmings, muskrats
The subfamily Arvicolinae contains eleven tribes, eight of which are classified as voles, two as lemmings, and one as muskrats. [13] Recent changes to the subfamily include disbanding genus Myodes in favor of genera Clethrionomys and Craseomys (and disbanding Myodini in favor of Clethrionomyini), moving most of the genera from Arvicolini to Microtini, and renaming Phenacomyini as Pliophenacomyini. [13]
Voles are small rodents that are relatives of lemmings and hamsters, but with a stouter body; a longer, hairy tail; a slightly rounder head; smaller eyes and ears; and differently formed molars. They are sometimes known as meadow mice or field mice in North America.
The Cricetidae are a family of rodents in the large and complex superfamily Muroidea. It includes true hamsters, voles, lemmings, muskrats, and New World rats and mice. At over 870 species, it is either the largest or second-largest family of mammals, and has members throughout the Americas, Europe and Asia.
Water voles are large voles in the genus Arvicola. They are found in both aquatic and dry habitat through Europe and much of northern Asia. A water vole found in Western North America was historically considered a member of this genus, but has been shown to be more closely related to members of the genus Microtus. Head and body lengths are 12–22 cm, tail lengths are 6.5–12.5 cm, and their weights are 70–250 g. The animals may exhibit indeterminate growth. They are thick-furred and have hairy fringes on their feet that improve their swimming ability.
Ondatrini is a tribe of semiaquatic rodents in the family Arvicolinae. They are known as muskrats. They are related to voles and lemmings.
The narrow-headed vole is a species of rodent in the family Cricetidae. It was previously placed in the genus Microtus, but modern listings either lump this into genus Lasiopodomys or split it out into Stenocranius. It ranges over northern and central Asia.
Arvicolini is a tribe of voles in the subfamily Arvicolinae.
Phenacomyini is a tribe of voles in the subfamily Arvicolinae. It contains five species in two genera, all of which are found in North America.
Lagurini is a tribe of lemmings in the subfamily Arvicolinae. It contains three species in two genera. Species in this tribe are known as steppe lemmings.
Microtini is a tribe of voles in the subfamily Arvicolinae.