Giant Vinegaroon Mastigoproctus tohono

The Arizona Giant Vinegaroon Mastigoproctus tohono is a non-venomous arachnid that look like scorpion, if they look like anything on this planet at all. Often called whipscorpion for their long, thread-like tail these ones differ from the species more frequently sourced from Texas , M. giganteus. These M. tohono have a reddish tint which is arguably prettier than the darker TX/regional ones.

Not counting the tail and whips, adults grow to reach about 2.75 to 3 inches (body length with pedipalps). They are only available unsexed, sorry.

Amazingly, and despite their rather intimidating appearance, these large animals are completely harmless to humans. They do however emit a spray that smells like vinegar (hence the name) and I’d recommend not putting the bug in your mouth or near your eyes and face. Unlike scorpions, their “pincers” consist of three parts instead of two. They use these to catch live prey like crickets or roaches.

One to three crickets a week are typically offered though they’ll eat roaches or moths from your porch light too. They may stop feeding for a period of time once their abdomen gets full. If you offer a deep substrate they will burrow. Some care should be taken that the substrate is not so loose that it will fall in on them (cave in). If you offer a substrate that is shallow then you will probably see them more, but they are probably happier with a deeper substrate. In this case a piece of bark or something else for them to hide under is recommended (see related products below). Room temperature is fine and warmer is fine too.

Tank/soil humidity can be added and maintained by pouring a little water into one side of the substrate. A small, shallow water dish can be offered too, though they get most of the moisture they need through eating their prey. These are very long lived though specimen age is never known due to their being wild caught. Large ones are older but may still live several years.

If you get table vinegar in your eyes it would be worse than the spray from the vinegaroons because it is more of a liquid. Their spray is a liquid too but finer, more like a misting than a stream. Even when they spray your hand you can hardly feel it. A lot of times they won’t even spray if you bother them. Different individuals are more or less likely to spray. Different people have a different sensitivity to it. I should recommend that you wash your hands if you are sprayed, but I don’t worry about it personally at all. It may just be that some people are more sensitive to it.