Mastigoproctus is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of whip scorpions. Native to the rain forest regions of northern South America

South America

South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...

, these whip scorpions can reach a length of up to 9 centimetres (3.5 in) and can weigh over 30 grams (1.1 oz). Despite popular belief, they are not venomous as like all other whip scorpions, they do not possess venom

Venom

Venom is the general term referring to any variety of toxins used by certain types of animals that inject it into their victims by the means of a bite or a sting...

 glands.

The following species have been described:

• Mastigoproctus baracoensis Franganillo, 1931 – Cuba
• Mastigoproctus brasilianus (C. L. Koch, 1843) – Brazil
• Mastigoproctus butleri Pocock, 1894 – Brazil
• Mastigoproctus colombianus Mello-Leitão, 1940 – Colombia
• Mastigoproctus formidabilis Hirst, 1912 – Venezuela
• Mastigoproctus giganteus
  Mastigoproctus giganteus
  Mastigoproctus giganteus or giant vinegarroon is a species of whip scorpion in the family Thelyphonidae.This species grows up to 85 mm. It lives in the southern US and in Mexico...
  
  (Lucas, 1835) – Mexico, United States
• Mastigoproctus liochirus Pocock, 1900 – Guatemala
• Mastigoproctus maximus (Tarnani, 1889) – Brazil
• Mastigoproctus minensis Mello-Leitão, 1931 – Brazil
• Mastigoproctus nara Valerio, 1981 – Costa Rica
• Mastigoproctus pelegrini Armas, 2000 – Cuba
• Mastigoproctus perditus Mello-Leitão, 1931 – Brazil
• Mastigoproctus proscorpio (Latreille, 1806) – Dominican Republic, Haiti, Martinique
• Mastigoproctus tantalus Roewer, 1954 – El Salvador
• Mastigoproctus transoceanicus Lazell, 2000 – Hong Kong