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Perissodactyla
- Order within the Infraclass Eutheria
- Tapirs, rhinos, horses
- 1. Femur w/ 3rd trochanter
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Equidae
- Family within the Order Parissodactyla
- Horses, assed, zebras
- 1. Orbit enclosed by postorbital bar
- 2. Nasal long and narrow
- 3. selenolophodont teeth
- 4. Bulla small
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Tapiridae
- Family within the Order Perissodactyla
- Tapirs
- 1. Nasal opening of skull very large and recessed
- 2. Nasal short, triangular, very high
- 3. Teeth look like wedges
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Rhinocerotidae
- Family within the Order Perissodactyla
- Rhino
- 1. Head concave dorsally
- 2. occipital crest well-developed
- 3. Nasal large and heavy for support of horn
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Artiodactyla
- Order within the Infraclass Eutheria
- Pigs, peccaries, hippos, camels, giraffes, deer, goats, sheep
- 1. astralagus w/ pulley-like surface above and below
- 2. No alisphenoid canal
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Suidae
- Family within the Order Artiodactlya
- Pigs
- 1. Incomplete postorbital bar
- 2. Canines with sharp edges directed out and up
- 3. Elongated paraoccipital process
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Tayassuidae
- Family within the Order Artiodactyla
- peccaries
- 1. Small paraoccipital process
- 2. Canines sharp vertically directed
- 3. Broad zygomatic
- 4. Incomplete postorbital bar
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Hippopotamidae
- Family within the Order Artiodactyla
- hippo
- 1. Terrifying canines
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Camelidae
- Family within the Order Artiodactyla
- Camels, llamas, alpacas
- 1. No horns or antlers
- 2. Postorbital bar complete
- 3. One pair of upper incisors
- 4. Molars selenodont
- 5. No sagittal crest
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Cervidae
- Family within the Order Artiodactyla
- Deer, elk, moose
- 1. Antlers only in males
- 2. Lacrimal depression present
- 3. antorbital vacuity between nasal and lacrimal bones
- 4. 2 lacrimal foramina at front edge/outside of orbit
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Antilocapridae
- Family within the Order Artiodactyla
- Pronghorn
- 1. No lacrimal depression
- 2. Two lacrimal foramina present on one side of orbit
- 3. preorbital vacuity
- 4. Orbits behind toothrow
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Giraffidae
- Family within the Order Artiodactyla
- The giraffe skull
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Bovidae
- Family within the Order Artiodactyla
- Antelope, bison, cows, farm animals
- 1. 1 lacrimal foremen inside orbit (2 in domestic)
- 2. Postorbital bar
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