Cope, E.D., 1881. The systematic arrangement of the order Perissodactyla. Proceedings of the American Philosophical Society 19: 377-401, figs. 1-2, tables 1-3
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World |
| Subject: |
Taxonomy |
| Species: |
All Rhino Species |
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Key to genera
1. Four anterior digits;
incisors 2/1, canine 0/1, no horn, posttympanic bone distinct = Aceratherium.
2. Three anterior digits
a. Posttympanic process not co?ssified with postglenoid
Incisors 2/1, canines 0/1, no dermal horn = Coenopus
Incisors 1/1, canines 0/1, no dermal horn = Aphelops
Incisors 0/1, canines 0/1, no dermal horn = Peraceras
Incisors 1/1, canines 0/1, a tuberosity for a dermal horn on each nasal bone = Diceratherium
Incisors 1/1, canines 0/1, a median dermal nasal horn = Ceratorhinus
Incisors 3/2, canines 0/1, a median dermal nasal horn = Zalabis
Incisors 0/0, canines 0/0, dermal horn median; no osseous nasal septum = Atelodus
aa. Posttympanic process co?ssified with postglenoid
Incisors 1/1, canines 0/1, dermal horn median; nasal septum not ossified = Rhinocerus
Incisors 0/0, canines 0/0, dermal horn median, nasal septum ossified = Coelodonta.
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The systematic arrangement of the order Perissodactyla
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