The<unk> e subfamily of Viperidae classifies the new world vipers, or pit vipers. The snakes have a pitlike depression behind the nostril that contains a heat-sensing organ used to find prey.
Includes rattlesnakes and copperheads
Venom causes local tissue injury, coagulopathy,and thrombocytopenia
Up to 25% of bites are dry bites
Rattlesnake
Cottonmouth
Copperhead
Sidewinder
Water moccasin
Massasauga
Venom form a<unk>  mainly damages local tissue via metalloproteinases and hyaluronidase which cause swelling edema and damage to capillaries.
Clinical effects consist of:
Local tissue damage
Coagulopathies (pro and anti effects)
Platelet dysfunction
Neurotoxic effects
Local tissue damage
Coagulopathies (pro and anti effects)
Platelet dysfunction
Neurotoxic effects
Crotaline envenomation
Necrotizing fasciitis
Stonefish envenomation
Cellulitis
Lionfish envenomation
Allergic Reaction
Fire coral envenomation
Hymenoptera stings 