Most<unk>  stings in North America result only in local pain.
Arizona Bark<unk>  (Centruroides sculpturatus), found in AZ, NV, NM, TX, and CA, is the only neurotoxic species found in North America and can cause systemic toxicity.
Four neurotoxins (toxins I to IV) have been isolated from C. exilicauda
Toxins target excitable membranes, especially at the neuromuscular junction, by opening sodium channels → repetitive depolarization of nerves in both sympathetic and parasympathetic nervous systems → catecholamine and acetylcholine release.
Scorpion envenomation
Hymenoptera stings 
Stonefish envenomation
Mammalian bites
Fire coral envenomation
Closed fist infection 
Lionfish envenomation
Dog bite