Aphonopelma

Pocock, 1901

Species Guides

18

Aphonopelma is a of tarantulas in the Theraphosidae, comprising the majority of North American tarantula north of Mexico and many Central American species. The genus includes approximately 54 currently recognized species, though remains problematic due to morphological similarity among species. Members are generally large-bodied with leg spans of 6 inches or more, and possess used in defense. The genus exhibits , with mature males becoming more active and wander in search of sedentary females.

Aphonopelma eutylenum by (c) Chris A. Hamilton, Brent E. Hendrixson, Jason E. Bond, some rights reserved (CC BY). Used under a CC-BY license.Aphonopelma johnnycashi by (c) Chris A. Hamilton, Brent E. Hendrixson, Jason E. Bond, some rights reserved (CC BY). Used under a CC-BY license.Aphonopelma johnnycashi by (c) Chris A. Hamilton, Brent E. Hendrixson, Jason E. Bond, some rights reserved (CC BY). Used under a CC-BY license.

Pronunciation

How to pronounce Aphonopelma: /æˌfɒnoʊˈpɛlmə/

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Identification

-level identification is exceptionally difficult due to morphological conservatism and simple genitalia that do not allow easy comparison. The 2016 taxonomic revision of U.S. species reduced 55 nominal species to 29 valid species, with 14 new species described. Accurate identification often requires examination of mature males, geographic location, and increasingly, molecular data. Some species can only be reliably distinguished by integrative approaches combining , genetics, distribution, and .

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Habitat

Primarily terrestrial, occupying burrows in ground. include desert grasslands, scrublands, and montane forests. In the southwestern U.S., found in desert and semi-arid environments. Some occupy mid- to high-elevation forests in mountain ranges (Madrean Sky Islands), where they experience cold winters. Burrows are typically small, cryptic openings in soil, often concealed by vegetation. Occupied burrows are sealed with a thin silk curtain during daytime; spiders plug burrows with soil during winter months.

Distribution

Native to the Americas. In the United States, found in twelve states across the southern third of the country, west of the Mississippi River to California. Range extends as far north as Missouri, Colorado, Utah, Nevada, and southern two-thirds of California. Also distributed throughout Mexico and into Central America. Some have highly restricted distributions confined to single mountain ranges.

Seasonality

males are most active and visible during warmer months, particularly summer monsoon season, when they abandon burrows to search for mates. Males are primarily . Females remain in burrows year-round, rarely venturing above ground. Activity ceases during winter when burrows are sealed.

Diet

. In captivity, fed crickets. In the wild, has been observed feeding on crickets, grasshoppers, , mantises, and beetles. Ambush predator that waits at burrow entrance at night to strike passing prey.

Life Cycle

Long-lived; minimum seven years to reach sexual maturity under optimal captive conditions. Females may live 30 years or more in captivity; wild specimens likely shorter-lived. Males die after reaching maturity and mating. Tarantulas are among the few spiders that continue molting after adulthood, a process that replenishes defensive hairs and sheds . Spiderlings are surprisingly small relative to size.

Behavior

and sedentary, with females rarely leaving burrows. Males exhibit pronounced mate-searching , wandering extensively during breeding season. One radio-tracking study documented males searching areas up to 29 hectares and moving up to 365 meters per day, though typical movement averaged 4.3 meters per day. Males are primarily . Defensive behavior includes kicking from the rather than biting; these barbed hairs cause irritation to mucous and can trigger allergic reactions. Males use tibial spurs to hold female fangs away during mating.

Ecological Role

Apex in many . Prey on insects and other small arthropods. Serve as prey for tarantula hawk (Pepsis and Hemipepsis), coatimundi, and other vertebrate predators. Females are particularly vulnerable to tarantula hawk wasps when above ground.

Human Relevance

Popular in the pet trade; some are specifically targeted due to rarity and attractive coloration. Not dangerous to humans despite fearsome appearance; bites are rare and not medically significant. can cause allergic reactions in sensitive individuals, including skin inflammation and irritation of and nasal passages. Subject of citizen science surveys and museum collection efforts. Some species of conservation concern due to restricted ranges and threats.

Similar Taxa

  • BrachypelmaAlso native to North America (including Mexico); distinguished by different geographic distribution and some morphological features, though both share New World tarantula characteristics including
  • SericopelmaPhylogenetically related; molecular studies suggest close relationship with Aphonopelma, particularly the Central American clade

More Details

Taxonomic Complexity

The has undergone extensive revision. A 2016 monograph revised U.S. , reducing 55 nominal to 29 species (14 newly described). Molecular phylogenetic studies indicate the genus is not monophyletic, with distinct U.S. and Central American clades that may warrant separate generic status.

Conservation Concerns

Some with restricted distributions in the Madrean Sky Islands threats from climate change, loss, urbanization, and potential overcollection for the pet trade. Two new species from southeastern Arizona are confined to single mountain ranges.

Traditional Ecological Knowledge

Recent research incorporates Traditional Ecological Knowledge from Apache and Tohono O'odham peoples to inform understanding of Aphonopelma diversity and distribution in the Madrean Pine-Oak Woodlands Hotspot.

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Sources and further reading