Order Rodentia

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Order Rodentia

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Most diverse order of mammals (40% of all species), deleterious relationship to humans from disease and crop damage

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Prolific reproduction

2. Lack specialization

3. Lack canines,

4. Hindgut ferenters with large cecums

5. Elodontous large chisel shaped incisors

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Characteristics of Rodentia

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Elodontous

Back 3

Teeth that grow continuously throughout life

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1. Sciuromorphs

2. Myomorphs

3. Cavimorphs

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Three Suborders of Rodentia

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Sciuromorphs

Back 5

Suborder with lateral masseter pulls lower mandible forward and deep masseter raises it

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Myomorphs

Back 6

Lateral and deep masseters pull lower jaw forward

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Caviomorphs

Back 7

Lateral masseter raises lower jaw and deep masseter pulls it forward

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Suborder Sciuromorpha

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Suborder with squirrel-like rodents

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Family Castoridae

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Beavers

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1. Build dams and lodges

2. Scent glands secrete castoreum

3. Webbed feet

4. Large flattened tail

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Characteristics of Castoridae

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Family Sciuridae

Back 11

Tree and ground squirrels

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1. Tree squirrels have excellent three dimensional visual acuity

2. Ground squirrels fossorial

3. Bushy tails

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Characteristics of Sciuridae

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Suborder Myomorpha

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Suborder of Mouse-like rodents

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1. Associated with disease and nuisance

2. Prolific breeders

3. Radiated from S. America from lack of insectivores and lagomorphs

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Key characteristics of Myomorphs

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Family Dipodidae

Back 15

Jumping mice and jerboas

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1. Elongated tarsals

2. Long tails

3. Long-term hibernators

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Characteristics of Dipodidae

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Suborder Hystricomorpha

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Suborder of larger rodents with shorter tails in proportion to the body

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Erethizontidae

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New World porcupines

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1. Quills lie flat unless threatened

2. Quills detach if prick predator

2. Precocial offspring

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Characteristics of Erethizontidae

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Family Caviidae

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Cavies, guinea pigs, capybaras: promiscuous groups with stocky bodies

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Family Chinchillidae

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Chinchillas and viscachas: Hunted heavily for pet trade and fur

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Family Hystricidae

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Old World porcupines: Very large quills

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Pholidata, Manidae

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Pangolin

Front 24

Tubulidentata, Orycteropdidae

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Aardvark

Front 25

Hyrocoidea, Procaviidae

Back 25

Hyrax