Aphonopelma iodius

Aphonopelma iodius is challenging to distinguish from other Aphonopelma species based on external morphology alone, as the genus exhibits limited diagnostic anatomical features. The species is generally smaller than A. chalcodes (Arizona Blonde), with less pronounced color contrast between leg segments. Mature males can be recognized by the presence of tibial spurs on the front legs, used during mating to restrain female fangs. Accurate identification typically requires examination of genitalia or molecular analysis.

Occupies webbed burrows in desert areas, particularly the Mojave Desert west of the Colorado River. Burrows are constructed beneath the soil surface and are commonly sealed with a silken or silk-and-dirt plug to regulate temperature and deter predators. During winter, burrows are plugged with soil to maintain stable conditions.

United States: California, Nevada, Arizona, and Utah. Most common in the Mojave Desert region west of the Colorado River.

Adult males are active above ground during autumn mating season. Females remain in burrows year-round, with nighttime hunting activity at burrow entrances during warmer months. Winter months are spent in sealed burrows.

Sexual maturity is reached at approximately seven years in males. Mating occurs in autumn, with males dying by mid-autumn after breeding. Females store sperm in spermathecae and lay eggs the following spring or summer. The species continues molting after reaching adulthood, a trait uncommon among spiders.

Constructs and maintains silk-lined burrows with defensive plugging behavior. Males exhibit ground-tapping and vibrational signaling when approaching female burrows to elicit emergence for mating. When threatened, individuals may use urticating hairs for defense by kicking them from the abdomen rather than biting. These barbed hairs cause irritation to mucous membranes and can trigger allergic reactions in sensitive individuals.

Occasionally kept in captivity, where females have been documented living over thirty years. Available in the pet trade under various regional common names, though less frequently encountered than more colorful tarantula species. Not considered dangerous to humans; bites are rare and venom is not medically significant.

• Aphonopelma chalcodesLarger body size and more pronounced sexual dimorphism in coloration; females have black femora with remaining leg segments brown, whereas A. iodius shows less contrast
• Aphonopelma johnnycashiMature males are solid black and larger (up to 6 inches leg span), with geographic restriction to California near Folsom Prison area
• Aphonopelma joshuaGeographically and phenotypically distinct species recognized in the same 1997 revision that synonymized species under A. iodius
• Aphonopelma mojaveGeographically and phenotypically distinct species recognized in the same 1997 revision that synonymized species under A. iodius

• theraphosidae
• mygalomorph
• desert
• burrowing
• long-lived
• synonymized species
• pet trade

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
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