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Rodentia
- Order within the Infraorder Eutheria
- Includes Suborders Sciuromorpha and Hystricomorpha
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Sciuromorpha
Suborder within the Order Rodentia
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Aplodontidae
- Family with the Suborder Sciuromorpha
- Mountain beaver
- 1. Inflected angular process on lower jaw
- 2. Crowns of cheekteeth ringlike w/ small projections
- 3. Apple-shaped teeth
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Sciuridae
- Family within the suborders Sciuromorpha
- Squirrels, chipmunks, prairie dogs, marmots
- 1. Large postorbital process
- 2. infraorbital foremen very small, slit-like
- 3. Rounded auditory bulla
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Castorimorpha
- Suborder within the Order Rodentia
- Contains families Castoridae, Heteromyidae, Geomyidae
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Castoridae
- Family within the Suborder Castorimorpha
- Beaver
- 1. Distinct depression in basioccipital
- 2. Very sturdy skull
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Heteromyidae
- Family within the suborder Castorimorpha
- Pocket mice, kangaroo rats, kangaroo mice
- 1. Fur-lined cheekpouches
- 2. infraorbital canal compressed against and entirely piercing the rostrum, opening laterally
- 3. Heart-shaped bulla
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Geomyidae
- Family within the suborder Castorimorpha
- Pocket gophers
- 1. 2 large pits located in palate behind last molars
- 2. Premolar figure 8-shaped (easier to see on larger skulls)
- 3. infraorbital canal compressed against side of rostrum, opening anterolaterally
- 4. Crowns of cheekteeth simple
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