8. Pulmonoscorpius

This was a giant species of extinct scorpion that grew up to 28 inches long. Unlike the usual scorpions, they didn’t live in forests or deserts but in swamps. They also had small pincers compared to their body size but a very thick tail. Although the exact potency of their venom is unknown, generally, the venom of scorpions with thick tails and small pincers is very potent.