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Kingdom Animalia (animals)
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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Deuterostomia (deuterostomes)
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Phylum Chordata (chordates)
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Craniata (craniates)
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Subphylum Vertebrata (vertebrates)
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Superclass Gnathostomata (jawed vertebrates)
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Euteleostomi (bony vertebrates)
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Class Sarcopterygii (lobe-finned fishes and terrestrial vertebrates)
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Tetrapoda (tetrapods)
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Amniota (amniotes)
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Synapsida (synapsids)
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Class Mammalia (mammals)
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Subclass Theria (Therian mammals)
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Infraclass Eutheria (placental mammals)
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Order Rodentia (rodents)
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Suborder Myomorpha (mice, rats, gerbils, jerboas, and relatives)
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Superfamily Muroidea (mice, rats, gerbils, and relatives)
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Family Cricetidae (New World rats and mice, voles, hamsters, and relatives)
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Subfamily Sigmodontinae (South American rats and mice)
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Genus Sigmodon (cotton rats)
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Species Sigmodon alleni (Allen's cotton rat) -



Species Sigmodon alstoni (Alston's cotton rat) -
Species Sigmodon arizonae (Arizona cotton rat)
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Species Sigmodon fulviventer (tawny-bellied cotton rat)
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Species Sigmodon hirsutus (southern cotton rat) -
Species Sigmodon hispidus (hispid cotton rat)
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Species Sigmodon inopinatus (unexpected cotton rat) -



Species Sigmodon leucotis (white-eared cotton rat) -



Species Sigmodon mascotensis (Jaliscan cotton rat) -
Species Sigmodon ochrognathus (yellow-nosed cotton rat)
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Species Sigmodon peruanus (Peruvian cotton rat) -



Species Sigmodon planifrons (Mihuatl\\u00e1n cotton rat) -



Species Sigmodon toltecus (Toltec cotton rat) -



Species Sigmodon zanjonensis (montane cotton rat)
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Confused by a class within a class or an order within an order? Please see our brief essay.
Scientific names for Aves taxonomy (family and below) are from The Howard and Moore Complete Checklist of the Birds of the World, Princeton University Press, copyright 2003. Used by permission.



