Tityus obscurus

It is one of the largest Tityus species, growing up to 65-100 mm.[1] More characterized by its black color, flattened body and legs and claws that are relatively thin, something specific to this species. It's terrestrial and nocturnal, during the day It hides under the stones, logs or loose bark, at night goes out to hunt its preys like insects and arthropods.[2] Juveniles have a brown body and appendix, stained with dark.[3]

They are found in the tropical and sub-tropical forests of northern South America (Brazil, French Guiana and Suriname), mainly in the amazon rainforest.[4]

They have excitatory neurotoxins and cardiotoxins, symptoms already reported in humans include severe local pain, edema, profuse sweating, nausea, vomiting, spreading numbness, muscle twitch, convulsions, semicoma, somnolence, hallucinations, tachypnea, tachycardia, excessive drooling and prostration.[5][6] In Guyana, a 16-year-old boy died 16 hours after being bitten by this species.[7] In Guyana, in a 12-month period 3 people died, two children and a 30-year-old man, both had local pain, and soon developed to vomiting and persistent leukocytosis, both died after developing cardiopulmonary failure and dysrhythmias.[8] The median lethal dose for this species is 3.13 mg / kg (i.p.).[9]