Kingdom Animalia (animals) Eumetazoa (metazoans) Bilateria (bilaterally symmetrical animals) Deuterostomia (deuterostomes) Phylum Chordata (chordates) Craniata (craniates) Subphylum Vertebrata (vertebrates) Superclass Gnathostomata (jawed vertebrates) Euteleostomi (bony vertebrates) Class Sarcopterygii (lobe-finned fishes and terrestrial vertebrates) Tetrapoda (tetrapods) Amniota (amniotes) Class Reptilia (turtles, snakes, lizards, and relatives) Order Squamata Family Viperidae Genus Crotalus Species Crotalus adamanteus (Eastern Diamondback Rattlesnake) Species Crotalus aquilus (Queretaran Dusky Rattlesnake) Species Crotalus atrox (Western Diamond-backed Rattlesnake) Species Crotalus basiliscus (Basilisk Rattlesnake) Species Crotalus catalinensis (Catalina Island Rattlesnake) Species Crotalus cerastes (Sidewinder) Species Crotalus durissus (Cascabel Rattlesnake) Species Crotalus enyo (Lower California Rattlesnake) Species Crotalus horridus (Timber rattlesnake (atricaudatus)) Species Crotalus intermedius (Mexican Smallhead Rattlesnake) Species Crotalus lannomi (Autlan Rattlesnake) Species Crotalus lepidus (lepidus) Species Crotalus mitchelli (mitchelli) Species Crotalus molossus (Black Tailed Rattlesnake) Species Crotalus oreganus (abyssus) Species Crotalus polystictus (Mexican Lancehead Rattlesnake) Species Crotalus pricei (Twin Spotted Rattlesnake) Species Crotalus pusillus (Tancitaran Dusky Rattlesnake) Species Crotalus ruber (Red Diamond Rattlesnake) Species Crotalus scutulatus (scutulatus) Species Crotalus stejnegeri (Longtail Rattlesnake) Species Crotalus tancitarensis Species Crotalus tigris (Tiger Rattlesnake) Species Crotalus tortugensis (Tortuga Island Rattlesnake) Species Crotalus transversus (Cross-banded Mountain Rattlesnake) Species Crotalus triseriatus (Central Plateau Dusky Rattlesnake) Species Crotalus unicolor (Aruba Island Rattlesnake) Species Crotalus vegrandis (Uracoan Rattlesnake) Species Crotalus viridis (viridis) Species Crotalus willardi (willardi)
