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Myomorpha
- Suborder within the Order Rodentia
- Consists of the Family Dipodidae,
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Dipodidae
- Family within the Suborder Myomorpha
- Jerboas, jumping mice, birch mice
- 1. infraorbital canal large, oval, open anteriorly
- 2. hindlimbs elongated in all genera
- 3. Nasal may extend anteriorly beyond level of upper incisors
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Cricetidae
- Family within the Suborder Myomorpha
- Contains subfamilies Arvicolinae and Sigmodontinae
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Arvicolinae
- Subfamily within the Family Cricetidae
- Voles, lemmings, and muskrat
- 1. characteristic "Christmas tree" shape to teeth
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Sigmodontinae
- Subfamily within the Family Cricetidae
- New World rats and mice
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Muridae
- Family within the Suborder Myomorpha
- Gerbils
- 1. Lacrimal enlarged and forming a conspicuous ledge over the anterior margin of the orbit
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Hystricomorpha
- Suborders within the Order Rodentia
- 1. Lower jaw hystricognathous
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Hystricidae
- Family within the suborder Hystricomorpha
- Old World porcupines
- No specimens in lab, only quills
- 1. occlusal surface of cheekteeth flat w/ folds forming islands
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Erethizontidae
- Family within the Suborder Hystricomorpha
- New World porcupines
- 1. Smaller than Old World
- 2. occlusal surface of cheekteeth flat, w/ narrow or wide enamel folds
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Chinchillidae
- Family within the suborder Hystricomorpha
- Chinchillas
- 1. Lacrimal canal w/ large opening on side of rostrum at front end of infraorbital canal
- 2. occlusal surface of cheekteeth flat, consisting of a series of transverse plates
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Caviidae
- Family within the Suborder Hystricomorpha
- Guinea pigs/capybara included
- 1. Lacrimal canal w/ small opening on side of rostrum at edge of infraorbital canal
- 2. Lower jaw w/ prominent ridge and groove on lateral surface
- 3. Upper toothrows strongly convergent anteriorly
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Myocastoridae
- Family within the Suborder Hystricomorpha
- Nutria
- 1. hindfeet webbed
- 2. infraorbital foramen very large
- 3. paraoccipital process relatively long, well-separated from bulla
- 4. No groove on lower jaw; angular process strongly deflected
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