This is a list of all sure genera, species and subspecies of the subfamily Crotalinae, [1] otherwise referred to as crotalines, pit vipers, or pitvipers, and including rattlesnakes Crotalus and Sistrurus . This list follows the taxonomy as of 2007 provided by ITIS, which was based on the continuing work of Dr. Roy McDiarmid. [2] with the addition of more recently described species.