Giant Desert Hairy Scorpion – The largest scorpion in North America

I have found several bark scorpions in our Arizona pond but this is the first time I found a Giant Desert Hairy ScorpionHadrurus arizonensis.  This giant scorpion is the largest scorpion in the United States.

Scorpions are related to spiders, ticks, mites, etc… They are venomous arthropods in the class Arachnida.   Scorpions have over 1,300 species throughout the world.  They have four pairs of legs and pedipalps with plier-like pincers on the end.

giant desert hairy scorpion

Hadrurus arizonensis, Giant Desert Hairy Scorpion

Three species of scorpions are commonly found in the Arizona - Sonoran Desert.

  1. small Bark Scorpion, Centruroides exilicauda
  2. Striped Tail or Devil’s Scorpion, Vaejovis spinigerus
  3. Giant Desert Hairy Scorpion, Hadrurus arizonensis

Arizona is home to more than 30 species of scorpions but the only truly life threatening one is the small Bark Scorpion.  Unlike the other species, Bark Scorpions like to climb.

Giant Arizona Scorpion

the largest scorpion in the US

Scorpions have mouthparts called chelicerae that enable it to rip and tear its prey while feeding.  They have a sensitive antennae along with the pincer-like pedipalps that are used to hold the prey while inflicting venom or eating.  The Scorpion’s body has two main parts; the cephalothorax and the abdomen.

Hadrurus arizonensis

the largest scorpion in North America, Hadrurus arizonensis

According to the book Scorpions: A Complete Pet Owner’s Manual, in order to measure a scorpion; start from the tip of the telson, stinger, to the prosoma, head.  Our Arizona scorpion was just over 5 inches!  Giant Hairy Scorpions have a dark back.

scorpion tail

Giant Desert Hairy Scorpion Tail, metasoma

The metasoma (tail) of the scorpion is actually an extension of the abdomen. It consists of five segments, each one longer than the last; at the tip is the telson (stinger).

All Scorpions are nocturnal and leave their shelters at night in search for prey.  A Giant Hairy Scorpion burrows deep in the desert soil.  This large scorpion follows the moisture level in the soil and can burrow as far as 8 feet below the surface.

Scorpion burrows are commonly oval or crescent-shaped.  

large Arizona Scorpion

Giant Desert Hairy Scorpion in Arizona

Although this scorpion is very large, the sting is somewhat mild and feels similar to a bee sting.  The sting is not life threatening.  If by some chance you experience an allergic reaction to a Giant Hairy Scorpion sting,  seek medical attention immediately.

Scorpions give birth to live young during the summer months and the babies safely ride on mom until their first molt, approximately 2-3 weeks.

If you really want to observe these ancient nocturnal arachnids, take a black light to the desert on a moonless, warm night.   In the dark you will be able to see scorpions dig burrows, capture prey and possible witness a unique mating ritual.

How do we try to keep our home scorpion free?  By keeping our windows and doors closed!  When opening a door in the desert, make it a habit to look at the bottom.  Bark Scorpions are smaller and more common in homes.  Bark Scorpion stings can be fatal so we have a contract with Truly Nolen that helps to keep our home safe.  http://www.trulynolen.com/

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