Oklahoma Brown Tarantula, Texas Brown Tarantula, Missouri Tarantula
Aphonopelma hentzi
Theraphosidae (Tarantulas), Order Araneae. Characterized by downward-pointing fangs (Mygalomorphae) and heavy, hairy bodies.
Physical Description
A robust, heavy-bodied spider with a dense covering of fine hairs (setae). The cephalothorax is broad and slightly flat, while the abdomen is large and oval-shaped. This specific specimen appears to be a mature male, indicated by the elongated legs and somewhat darkened, sleek appearance often seen when they roam.
Size Estimate
Body length typically 2 inches (50mm), with a leg span of 4 to 5 inches. This individual appears to be a full-grown adult.
Coloration & Markings
Generally shades of dark brown to black. This specimen shows a very dark, almost charcoal-black phase. They lack bright colors or intricate patterns, relying on earthy tones for camouflage against soil and leaf litter.
Web Type
They do not spin webs to catch prey. Instead, they are ground-dwelling hunters. They may line their burrows with silk for structural integrity and to sense vibrations from passing prey.
Eye Arrangement
A small tubercle on the front of the cephalothorax contains eight small eyes clustered closely together. Their vision is poor, primarily used to detect light levels rather than form clear images.
Leg Characteristics
Thick, powerful legs covered in sensitive hairs. The legs are well-adapted for digging and walking long distances. Intact spinnerets are visible at the rear of the abdomen.
Venom & Safety Information
Venom Information
The venom is not considered dangerous to humans. It is chemically similar to a bee sting, designed to paralyze small insects.
Medical Significance
Low medical significance. A bite may cause localized pain, redness, and swelling. The primary defense is urticating hairs, which cause skin and eye irritation. Medical attention is only necessary in cases of rare allergic reactions.
Safety Recommendations
Do not panic. To relocate, place a large bowl or tupperware over the spider, slide a piece of stiff cardboard underneath, and carry it outside to a grassy area. Do not handle with bare hands to avoid irritating hairs.
Habitat & Behavior
Habitat & Range
Common throughout the South-Central United States, specifically Oklahoma, Texas, Kansas, and Missouri. They prefer dry, open areas, grasslands, and rocky hillsides where they can dig burrows.
Behavior & Temperament
Generally docile and non-aggressive. When threatened, they may 'rear up' to show fangs or flick urticating (irritating) hairs from their abdomen. In Oklahoma, mature males are often seen wandering in late summer/early fall looking for mates.
Diet & Prey
Nocturnal ambush hunters that eat crickets, beetles, grasshoppers, and occasionally small lizards or mice. They sense vibrations to locate prey and use their strength to overpower it.
Seasonal Activity
Highest activity in Oklahoma occurs from June through October, peaking in late August/September during the 'tarantula migration' (mating season).
Description
The Oklahoma Brown is the most common tarantula in the region. Despite their intimidating size, they are gentle giants of the prairie, playing a vital role in local pest control. This wandering male has likely entered the home accidentally while searching for a female's burrow.
Key Features
Large size, heavy hairy body, uniform dark brown/black coloration, and distinctive two-fingered spinnerets at the back of the abdomen.
Similar Species
May be confused with other Aphonopelma species, but A. hentzi is the only large tarantula naturally occurring in Oklahoma. It is much larger than any local Wolf Spider.
Life Cycle
Females can live up to 30 years in captivity (20 in the wild); males live only 5-10 years and die shortly after their first mating season. They go through several molts to grow, with spiderlings dispersing via ground travel.
Ecological Importance
They are essential apex predators in the invertebrate world, keeping populations of large insects like grasshoppers and June bugs in check.
Conservation Status
Not listed by the IUCN, but populations face threats from habitat fragmentation and the pet trade. They are generally stable in rural Oklahoma.
Interesting Facts
They are the most northern-reaching tarantula species in the Americas. When a male matures, he leaves his burrow forever to find a mate, which is why they are often found on roads or in homes during late summer.
Photography Tips
Shoot from a low angle to capture the 'face' and eye cluster. Use natural light if possible to avoid washing out the subtle brown textures of the hairs.
User Notes
This spider was on my couch at home in Oklahoma
Identified: 2026-06-05T01:45:30.979247