Ammospermophilus
Spermophilus
Cynomys
Marmota
Tamias
Sciurotamias The Oligocene epoch is a geologic period of time that extends from about 34 million to 23 million years before the present. ... California Ground Squirrel. ... Binomial name Spermophilus beecheyi (Richardson, 1829) The California Ground Squirrel, Spermophilus beecheyi (referred to in some older sources as Otospermophilus beecheyi or Citellus beecheyi), is a common and easily observed ground squirrel of the western United States and the Baja California peninsula; it is common in Oregon and California and... Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. ... For other uses, see Animal (disambiguation). ... Typical Classes Subphylum Urochordata - Tunicates Ascidiacea Thaliacea Larvacea Subphylum Cephalochordata - Lancelets Subphylum Myxini - Hagfishes Subphylum Vertebrata - Vertebrates Petromyzontida - Lampreys Placodermi (extinct) Chondrichthyes - Cartilaginous fishes Acanthodii (extinct) Actinopterygii - Ray-finned fishes Actinistia - Coelacanths Dipnoi - Lungfishes Amphibia - Amphibians Reptilia - Reptiles Aves - Birds Mammalia - Mammals Chordates (phylum Chordata) include the vertebrates, together with... Typical classes Petromyzontidae (lampreys) Placodermi - extinct Chondrichthyes (cartilaginous fish) Acanthodii - extinct Actinopterygii (ray-finned fish) Actinistia (coelacanths) Dipnoi (lungfish) Amphibia (amphibians) Reptilia (reptiles) Aves (birds) Mammalia (mammals) Vertebrata is a subphylum of chordates, specifically, those with backbones or spinal columns. ... Subclasses & Infraclasses Subclass †Allotheria* Subclass Prototheria Subclass Theria Infraclass †Trituberculata Infraclass Metatheria Infraclass Eutheria Mammals (class Mammalia) are warm-blooded, vertebrate animals characterized by the production of milk in female mammary glands and by the presence of: hair, three middle ear bones used in hearing, and a neocortex region in... Suborders Sciuromorpha Castorimorpha Myomorpha Anomaluromorpha Hystricomorpha Rodentia is an order of mammals also known as rodents. ... Genera Many: see text. ... For other uses, see Genus (disambiguation). ... Species A. harrisii A. nelsoni A. leucurus A. interpres A. insularis The Antelope squirrels or Antelope ground squirrels are the genus Ammospermophilus of sciurids found in the south-western Mexico. ... Species about 38: see text. ... Species Cynomys gunnisoni Cynomys leucurus Cynomys ludovicianus Cynomys mexicanus Cynomys parvidens Prairie dogs are small stout-bodied burrowing rodents with shallow cheek pouches native to both North and Central America. ... Species see text Marmots are members of the genus Marmota, in the rodent family Sciuridae (squirrels). ... Species Genus: Tamias Tamias alpinus (Alpine Chipmunk) Tamias amoenus (Yellow pine Chipmunk) Tamias canipes (Gray-footed Chipmunk) Tamias cinereicollis (Gray-Collared Chipmunk) Tamias dorsalis (Cliff Chipmunk) Tamias merriami (Merriams Chipmunk) Tamias minimus (Least Chipmunk) Tamias obscurus (California Chipmunk) Tamias ohrogenys (Yellow-cheeked Chipmunk) Tamias palmeri (Palmers Chipmunk) Tamias... Sciurotamias is a genus of rodent in the Sciuridae family. ...