There are more than 2000 species of rodents alive today, making them the most diverse of all mammal groups.

The earliest castorids belong to the genus Agnotocastor, known from the late Eocene and Oligocene of North America and Asia. It is the largest living member of the order Rodentia (the rodents) reaching a length of 4 ft (120 cm) and a weight of 75 to 100 lb (34–45 kg). Order Rodentia - Chapter Summary. Families in the order Rodentia include rats, mice, porcupines, hamsters, beavers, squirrels, chipmunks, lemmings, muskrats, and guinea pigs (rabbits are not rodents).

Rodents range in size from pygmy mice weighing 5 gms to capybaras, the largest of which weigh over 70 kg. … Moreover, order Rodentia contains more than 30 families with some 1600 species. They are found around the world except in Antarctica, New Zealand, and on some … The porcupine provides a good example of typical rodent skull characteristics. Lagomorph, (order Lagomorpha), any member of the mammalian order made up of the relatively well-known rabbits and hares (family Leporidae) and also the less frequently encountered pikas (family Ochotonidae). Porcupine (Order Rodentia) The order Rodentia includes larger species such as beavers and porcupines, along with smaller representatives such as mice and rats. Order Rodentia rodents.

Order Rodentia - Chapter Summary. Rodents are the mammals belonging to the largest and most diversified order of living mammals: Rodentia. Shrews, moles and hedgehogs are also not rodents; they are classified in the Mammal order Eulipotyphla.) Castorimorpha: pictures (40) Castorimorpha: …

Rodents occur in every continent except Antarctica, and live in habitats as diverse as Arctic tundra, forests and hot, dry deserts. skull. Monophyly of the order Rodentia inferred from mitochondrial DNA sequences of the genes for 12S ribosomal RNA, 16S ribosomal RNA, and transfer RNA valine. Rodents are found native on all continents except Antarctica. Incisors; No canines Cheek teeth Characteristics related to mode of locomotion (quadrupedal saltatory) Digitigrade/ plantigrade Skull Fenestration; Jointed Soles of feet are furred Tail is short or absent Families Ochotonidae . Rabbits and hares characteristically have long ears, a short tail, and strong hind limbs that provide a bounding locomotion.

Hide, and W. H. Li. Rodents range in size from pygmy mice weighing 5 grams to capybaras, the largest of which weigh over 70 kilograms. They have a pair of incisors in both upper and lower jaws , The incisors are sharp and chisel-shaped , The tail is long and ears are small , such as Rat , Gerbo , Mouse and squirrel . Anomaluromorpha: pictures (9) Anomaluromorpha: specimens (24) Suborder Castorimorpha beavers, gophers, kangaroo rats, pocket mice, and relatives. rodent: Characteristics of Rodents. 1991. Characteristics related to diet Teeth.