The red-toothed shrews of the subfamily Soricinae are one of three living subfamilies of shrews, along with Crocidurinae and Myosoricinae. In addition, the family contains the extinct subfamilies Limnoecinae, Crocidosoricinae, Allosoricinae and Heterosoricinae. These species are typically found in North America, northern South America, Europe and northern Asia. The enamel of the tips of their teeth is reddish due to iron pigment. The iron deposits serve to harden the enamel and are concentrated in those parts of the teeth most subject to wear.
The genus Cryptotis is a group of relatively small shrews with short ears, which are usually not visible, and short tails, commonly called small-eared shrews. They have 30 teeth and are members of the red-toothed shrew subfamily. Since 1992, Neal Woodman at the United States National Museum has been in the process of revising the genus. To date, this has resulted in an increase in the number of species from 12 to 30.
Oryzomys nelsoni is an extinct rodent of María Madre Island, Nayarit, Mexico. Within the genus Oryzomys of the family Cricetidae, it may have been most closely related to the mainland species O. albiventer. Since its first description in 1898, most authors have regarded it as a distinct species, but it has also been classified as a mere subspecies of the marsh rice rat (O. palustris).
Nelson's woodrat is a species of rodent in the family Cricetidae. It is endemic to Mexico, where it is known only from the eastern slopes of the volcanoes Orizaba and Cofre de Perote. Due to the small geographic range, isolation, and low population, the Nelson's woodrat has a higher risk for extinction. The distribution and population sizes are small. The population exists in geographic isolation, which prevents gene flow
Enders's small-eared shrew is a species of mammal in the family Soricidae. It is endemic to Panama.
The big Mexican small-eared shrew is a species of mammal in the family Soricidae. It is endemic to Mexico.
The Merida small-eared shrew is a species of shrew that is endemic to Venezuela.
The Mexican small-eared shrew is a species of mammal in the family Soricidae. It is endemic to Mexico.
The wandering small-eared shrew is a species of shrew in the family Soricidae. It is endemic to Ecuador.
The blackish small-eared shrew is a species of shrew in the family Soricidae. It is found in parts of Costa Rica, El Salvador, Guatemala, Honduras, Mexico, and Panama. An example specific habitat is the Petenes mangroves of the Yucatán.
The Ecuadorian small-eared shrew is a species of shrew in the family Soricidae. It is found on the western and eastern slopes of the Andes in central Ecuador.
The tropical small-eared shrew is a very small mammal of the family Soricidae. The species is found in the eastern highlands of Chiapas, Mexico, and parts of Belize and Guatemala. Until recently, it was considered a subspecies of the North American least shrew, but it has gained species status. Its relationship with the Central American least shrew remains to be studied.
The Colombian small-eared shrew is a species of mammal in the family Soricidae. It is endemic to Colombia, where it is known from the Cordillera Central in Antioquia Department at elevations from 1,750 to 2,800 m. It is found in montane forest and cultivated areas. It resembles C. brachyonyx.
The grizzled Mexican small-eared shrew is a small mammal in the order Eulipotyphla. It is native to the Sierra Madre Oriental of eastern Mexico. It can be found in dense, wet cloud forest, where it is found in the thick herbaceous undergrowth and leaf litter. It is known to be insectivorous and terrestrial. Threats to the species are deforestation for agriculture and urban development.
Phillips' small-eared shrew or Phillips' short-eared shrew is a species of mammal in the family Soricidae found in Mexico.
