Citellina
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Citellina
''Citellina'' is a genus of nematodes within the Oxyuridae Oxyuridae is a family of nematode worms of the class Secernentea. It consists of eight genera Genus (; : genera ) is a taxonomic rank above species and below family as used in the biological classification of living and fossil organisms as ... family. Species of this genus typically parasitise marmots and ground squirrels of holarctic distribution. It was initially defined by Prendel in 1928, with the type species ''Citellina dispar'' ''Citellina triradiata'' has been recovered from the Spotted Ground Squirrel (''Xerospermophilus spilosoma''), and ''Citellina undulata'' is described from the Long-tailed Ground Squirrel (''Urocitellus undulatus''). References Oxyuridomorpha Rhabditida genera {{Rhabditida-stub ...
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Genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants of an ancestral taxon are grouped together (i.e. Phylogeneti ...
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Oxyuridae
Oxyuridae is a family of nematode worms of the class Secernentea. It consists of eight genera Genus (; : genera ) is a taxonomic rank above species and below family as used in the biological classification of living and fossil organisms as well as viruses. In binomial nomenclature, the genus name forms the first part of the binomial s ..., one of which contains the human pinworm (''Enterobius vermicularis''). References Oxyuridomorpha Parasitic nematodes of vertebrates Nematode families {{parasite-animal-stub ...
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Spotted Ground Squirrel
The spotted ground squirrel (''Xerospermophilus spilosoma'') is a species of ground squirrel in the rodent family Sciuridae. It is found throughout Mexico and the central and western United States. Characterized by a white spotted back, the spotted ground squirrel is one of the smallest squirrels found in North America. They are mainly herbivorous, but also eat insects. A burrowing mammal, the spotted ground squirrel will make tunnels to store its food, as well as shelter and hibernation quarters. Description The spotted ground squirrel is one of the smallest squirrels to inhabit the northern hemisphere. It has many white linear dorsal spots, as well as a white underbelly. Coloration of the rest of its body varies greatly and can be different shades of brown, black, gray and white. Its skull resembles that of the thirteen-lined ground squirrel, but is slightly broader in the interorbital and rostral regions. A unique characteristic of the skull is the presence of especially larg ...
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Long-tailed Ground Squirrel
The long-tailed ground squirrel or Eversmann's souslik (''Urocitellus undulatus'') is a species of rodent in the squirrel family Sciuridae. It is found in China, Kazakhstan, Mongolia, and Russia. Description The long-tailed ground squirrel has a compact, low-slung body, short legs and a long bushy tail. The body length reaches up to and the tail . The back is brown with a linear pattern of dark, small spots. The underparts are a paler ochre-brown with a reddish tinge along the side. The tail is barred in brown and black with a prominent light edge stripe and a pale tip. Distribution and range This species is found in submontane steppes up to , plains, meadows, the edges of pine forests and birch woods, clearings and agricultural land from Southern Siberia and Altai (Russia) to Manchuria. There are two isolated populations in Eastern Siberia, one in southeastern Yakutia and the other in the south of the Amur region. It also occurs in Mongolia and in the northwestern and northe ...
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Oxyuridomorpha
Oxyuridomorpha is an infraorder of nematode worms in the suborder Spirurina. It was formerly considered an order within Nematoda The nematodes ( or ; ; ), roundworms or eelworms constitute the phylum Nematoda. Species in the phylum inhabit a broad range of environments. Most species are free-living, feeding on microorganisms, but many are parasitism, parasitic. Parasitic ..., under the name Oxyurida. As currently accepted, it comprises the superfamilies Oxyuroidea and Thelastomatoidea. References Parasitic nematodes of vertebrates Nematode orders {{parasitic animal-stub ...
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