Taxonomic Hierarchy
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| Kingdom | Animalia
– Animal, animaux, animals |
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| Subkingdom | Bilateria
– triploblasts |
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| Infrakingdom | Deuterostomia
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| Phylum | Chordata
– cordés, cordado, chordates |
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| Subphylum | Vertebrata
– vertebrado, vertébrés, vertebrates |
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| Infraphylum | Gnathostomata
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| Superclass | Tetrapoda
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| Class | Reptilia Laurenti, 1768
– répteis, reptiles, Reptiles |
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| Order | Squamata Oppel, 1811
– Amphisbaenians, Lizards, Snakes, amphisbènes, lézards, serpents |
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| Suborder | Serpentes Linnaeus, 1758
– Snakes, cobra, serpente, serpents |
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| Infraorder | Alethinophidia Nopcsa, 1923
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| Family | Viperidae Oppel, 1811
– Pit Vipers, Vipers |
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| Subfamily | Crotalinae Oppel, 1811
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| Genus | Crotalus Linnaeus, 1758
– Rattlesnakes |
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| Species | Crotalus ravus Cope, 1865 – Víbora-cascabel pigmea-mexicana, Mexican Pygmy Rattlesnake |
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Direct Children: |
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| Subspecies |
Crotalus ravus brunneus Harris and Simmons, 1978
– Oaxacan Pygmy Rattlesnake | |
| Subspecies |
Crotalus ravus exiguus (Campbell and Armstrong, 1979)
– Guerreran Pygmy Rattlesnake | |
| Subspecies |
Crotalus ravus ravus Cope, 1865
– Central Plateau Pygmy Rattlesnake | |
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