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Giant Vinegaroon (Mastigoproctus giganteus)

Mastigoproctus giganteus

The Mastigoproctus giganteus, commonly known as the 'Giant Vinegaroon' or Whipscorpion. It is one of the largest and most fascinating North American arachnids, capable of reaching 3.1 inches in body length (plus the very long whip tail). Massive, totally black or very dark brown, it resembles a prehistoric scorpion, but IT IS TOTALLY DEVOID OF VENOM. Its name 'Vinegaroon' (from vinegar) derives from its spectacular defense weapon: it sprays with surgical precision an acidic and nauseating liquid (based on acetic acid) from the base of the tail towards the eyes of predators. Extremely docile, harmless and formidable digger (pure fossorial), requires terrariums with deep soil where it builds intricate dens. Perfect for beginners fascinated by alien anatomies and chemical defenses.

Taxonomy
Class:Arachnida
Order:Uropygi
Family:Thelyphonidae
Genus:Mastigoproctus
Species:Mastigoproctus giganteus

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Environment

Terrestrial

Humidity

70 - 85 %

Day temperature

24 - 28 °C

Night temperature

20 - 22 °C

UVB

None

Species description

Geographic Origin and Habitat: This recovery makes no geographic-origin or habitat statement beyond the cited facts above.
Taxonomy and Genetics: GBIF Backbone Taxonomy lists Mastigoproctus giganteus (Lucas, 1835) at species rank. GBIF Backbone Taxonomy places Mastigoproctus giganteus in the order Uropygi, family Thelyphonidae and genus Mastigoproctus. This recovery makes no genetic statement beyond the cited facts above.
Behaviour and Habits: This recovery makes no behavioural statement beyond the cited facts above.
Morphology and Sexual Dimorphism: This recovery makes no morphological or sex-comparison statement beyond the cited facts above.

Care, breeding and tankmates

Terrarium Setup: Animal Diversity Web describes field shelter use beneath plant debris, in rock crevices, and in burrows. This is natural-history context, not a captive setup protocol.
Lighting and Heating: Animal Diversity Web reports that Mastigoproctus giganteus is nocturnal and shelters during daylight. This is a field-behaviour observation, not a captive lighting or heating parameter.
Humidity and Hydration: The source does not establish captive humidity or hydration parameters.
Feeding and Supplementation: Animal Diversity Web describes the species as carnivorous, feeding primarily on arthropods, and records small frogs and toads among prey. This is field-diet context, not a captive feeding or supplementation protocol.
Compatibility and Coexistence: The source does not establish captive compatibility, grouping, or coexistence guidance.
Health and Common Diseases: Animal Diversity Web reports a defensive spray mainly comprised of acetic acid. This is a documented defensive behaviour, not a handling, health, or veterinary protocol.

Geographic Origin and Distribution

This species originates from: Nord America (Aree aride, savane sabbiose e foreste cespugliose di Sud-Ovest USA e Messico).

Origin

Central America and CaribbeanNorth AmericaEast Asia

Terrestrial invertebrate profile

Diet
No verified data available
Life expectancy
No verified data available
Adult size
6.4 cm
The catalog's scalar value is 6.4 cm. The Animal Diversity Web — Mastigoproctus giganteus source reports a maximum adult measurement of 6.4 cm for this species, recorded as body length. The taxonomic record consulted is Mastigoproctus giganteus. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
Lifestyle/Microhabitat
No verified data available
Activity cycle
No verified data available
Sociality
No verified data available
Reproduction
No verified data available
Venom level
No verified data available
Handling tolerance
No verified data available
Brumation
No verified data available
Molting
No verified data available

Image gallery

Licensed images linked to the species or, when marked, to the closest representative taxon.

Related species

Recommendations grouped by close relatives, companion choices, and similar care.

Variants and close relatives

Same atlas type, nearby scientific identity, genus, or family.

Asian Whip Scorpion (Thelyphonus doriae)

Asian Whip Scorpion (Thelyphonus doriae)

Thelyphonus doriae

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Last updated: 08/10/2026
Giant Vinegaroon (Mastigoproctus giganteus) Care Guide & Terrarium Setup | Atlarium