The emperor scorpion (Pandinus imperator) is one of the largest species of scorpion in the world, with adults averaging about 20 cms in length and a weight of 30 g. [https://web.archive.org/web/20090129081549/http://www.arkive.org/emperor-scorpion/pandinus-imperator/ ARKive However, some species of forest scorpions are fairly similar to the emperor scorpion in size, and one scorpion, Heterometrus swammerdami, holds the record for being the world's largest scorpion at 9 inches (23 cm) in length.