Alligators are reptiles and are closely related to dinosaurs and birds; they are all diapsids, and all have two opening on each side of the skull. Alligators are also Archosaurs (which have a single skull opening in front of the eyes), like the birds, dinosaurs, pterosaurs, and crocodiles. Alligators belong to the family Crocodilia, which include the alligators, caimans, crocodiles, and gharials.
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Vertebrates
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Tetrapods (Amphibians, Reptiles, Turtles, Dinosaurs, Birds, Mammals, ...)
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Diapsids (Reptiles, Dinosaurs, Birds)
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Archosaurs (Dinosaurs, Birds, Crocodilians)
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Crocodilians (23 species)
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Alligatoridae
- Alligator mississippiensis - American Alligator
- Alligator sinensis - Chinese Alligator
- Caiman crocodilus (crocodilus) - Spectacled Caiman
- Caiman c. apaporiensis - Rio Apaporis Caiman
- Caiman c. fuscus - Brown Caiman
- Caiman latirostris - Broad-snouted Caiman
- Caiman yacare - Yacare Caiman
- Melanosuchus niger - Black Caiman
- Paleosuchus palpebrosus - Cuvier's Dwarf Caiman
- Paleosuchus trigonatus - Smooth-fronted Caiman
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Crocodylidae
- Crocodylus acutus - American Crocodile
- Crocodylus cataphractus - Slender-snouted Crocodile
- Crocodylus intermedius - Orinoco Crocodile
- Crocodylus johnstoni - Australian Freshwater Crocodile
- Crocodylus mindorensis - Philippine Crocodile
- Crocodylus moreletii - Morelet's Crocodile
- Crocodylus niloticus - Nile Crocodile
- Crocodylus novaeguineae - New Guinea Crocodile
- Crocodylus palustris - Mugger / Marsh Crocodile
- Crocodylus porosus - Estuarine / Saltwater Crocodile
- Crocodylus rhombifer - Cuban Crocodile
- Crocodylus siamensis - Siamese Crocodile
- Osteolaemus tetraspis - Dwarf Crocodile
- Tomistoma schlegelii - False Gharial / Gavial
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Gavialidae
- Gavialis gangeticus - Gharial / Gavial
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Alligatoridae
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Crocodilians (23 species)
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Archosaurs (Dinosaurs, Birds, Crocodilians)
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Diapsids (Reptiles, Dinosaurs, Birds)
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Tetrapods (Amphibians, Reptiles, Turtles, Dinosaurs, Birds, Mammals, ...)
Information from: crocodilian.com
