Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Species Mastigoproctus giganteus - Giant Vinegaroon

Vinegaroon - Mastigoproctus giganteus Can anyone help me identify this? - Mastigoproctus giganteus Insect - Mastigoproctus giganteus unknown crawler - Mastigoproctus giganteus Mastigoproctus  - Mastigoproctus giganteus Mastigoproctus  - Mastigoproctus giganteus Vinegaroon - Mastigoproctus giganteus Mastigoproctus tohono [was considered M. giganteus] - Mastigoproctus giganteus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Uropygi (Whipscorpions)
Family Thelyphonidae
Genus Mastigoproctus
Species giganteus (Giant Vinegaroon)
Other Common Names
Vinegarroon, Vinegaroon
Synonyms and other taxonomic changes
Mastigoproctus giganteus (Lucas)
Orig. Comb: Thelyphonus giganteus Lucas 1835
only whipscorpion n. of Mex.
up to 85 mm (>3")
AZ-TX-OK, FL / Mex - UF, 2011
July-Oct (BG data)
Carnivorous - preys on smaller creatures (insects, worms and slugs).
The vinegaroon is nocturnal and has poor vision. The whiplike tail is used as a sensory organ, as is the first pair of legs, which is not used for walking. Although its tail in unable to sting, this creature can spray an acidic mist from a scent gland at the base of the tail when disturbed. The spray is 85% concentrated acetic acid/vinegar, hence the common name "Vinegaroon." The heavy pinching mouthparts (modified pedipalps) can also inflict a painful bite. Although very unlikely to attack humans, it can certainly defend itself if provoked.
Internet References
Featured Creatures - W.H. Kern Jr. and R.E. Mitchell, UF, 2011 - diagram of bodyparts