Tliltocatl vagans

The combination of large size, black to dark brown body, and conspicuous red-orange abdominal hairs distinguishes Tliltocatl vagans from most other tarantulas in its range. The former genus Brachypelma contained several similarly colored species; T. vagans can be separated from Tliltocatl verdezi (Mexican rose-gray tarantula) by the latter's more uniform gray coloration and pinkish leg joints, and from Tliltocatl kahlenbergi by differences in leg banding patterns and abdominal hair density. In Florida, it may be confused with native tarantulas but the red rump is diagnostic. The burrowing habit and nocturnal activity pattern also aid identification.

Terrestrial shrubland and tropical forest edge habitats; constructs permanent burrows in soil, often beneath stones, roots, or other cover. In its native range, occupies the Yucatán Peninsula and surrounding regions. In the introduced Florida population, has been documented in St. Lucie County. Prefers well-drained soils suitable for excavation. The burrow serves as a retreat during daylight hours and a nursery for egg sacs.

Native to Mexico (including the Yucatán Peninsula), Guatemala, and Belize. Established non-native population in Florida, USA (St. Lucie County and potentially expanding), first documented in 1996. The Florida population is thought to have originated from intentional or accidental releases of pet trade specimens.

Nocturnally active year-round in tropical habitats; activity patterns in temperate introduced populations likely reduced during cooler months. Mating season and male wandering behavior not explicitly documented in sources but presumed to follow patterns typical for the genus with increased male activity during warmer, wetter periods.

Generalist predator consuming anything it can overpower; primarily insects and other arthropods. Small lizards and rodents have been documented as prey items for larger individuals. Prey is captured with stealth or speed, immobilized with fangs, then ground into a ball and externally digested with enzymes before liquid contents are consumed.

Female deposits several hundred eggs in a silken egg sac, which is stored in the burrow and guarded until hatching. Spiderlings emerge from the egg sac and disperse; high rate of mortality prior to sexual maturity has been documented. Females reach sexual maturity later than males and live substantially longer. Males do not construct sperm webs but deposit sperm on a thin web and transfer it to the female using pedipalps during courtship.

Nocturnal hunter that ambushes or pursues prey near the burrow entrance. When threatened, raises abdomen and rubs hind legs against it to release urticating hairs that can irritate eyes and nasal passages of predators. Generally docile when handled, though individuals vary in temperament; some display skittish behavior. Constructs and maintains a permanent burrow, repairing damage and expanding as needed. Does not build capture webs.

Apex invertebrate predator in its microhabitat; regulates populations of insects and small vertebrates. Serves as prey for larger vertebrates including mammals, birds, and reptiles. The urticating hair defense and burrowing habit represent important adaptations in predator-prey dynamics. In Florida, represents a novel predator in the local food web, though population numbers have declined due to pesticide exposure affecting prey availability.

Highly valued in the pet trade for its attractive coloration and generally docile temperament; frequently bred in captivity. Listed on CITES Appendix II (under former name Brachypelma vagans) to regulate international trade and prevent overcollection from wild populations. Used in traditional Ch'ol Maya medicine: crushed and mixed with alcohol to treat chest pain, coughing, and asthma ("tarantula wind"). The venom peptide GsMtx-4 is under investigation for potential therapeutic applications including cardiac arrhythmia, muscular dystrophy, and glioma treatment. Bite is not medically significant to humans, causing localized pain, swelling, and itching.

• Tliltocatl verdeziFormerly Brachypelma verdezi; similar size and build but lacks red abdominal hairs, instead showing uniform gray coloration with pinkish joints on legs
• Tliltocatl kahlenbergiFormerly Brachypelma kahlenbergi; Mexican species with different leg banding pattern and less dense abdominal hair covering
• Brachypelma smithi (now Tliltocatl smithi)More famous Mexican red-knee tarantula with distinctive red-orange patches on leg joints rather than abdominal red hairs; also CITES-listed

The name "tarantula" originates from Italian folklore about Lycosa tarantula, a wolf spider, and the supposed condition of "tarantism" curable by frenzied dancing. True tarantulas (Theraphosidae) are unrelated to this European spider. Despite their large size and prominent fangs, T. vagans poses minimal medical risk to humans; bites are painful but not dangerous. The species is sometimes mistakenly considered aggressive, but is generally docile and reluctant to bite, preferring to use urticating hairs as a first defense.

• arachnid
• tarantula
• theraphosidae
• burrowing spider
• nocturnal predator
• urticating hairs
• pet trade
• CITES listed
• traditional medicine
• invasive species Florida
• long-lived

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Archive — Bug of the Week
• A friendly encounter with a very large tarantula: Red Rump Tarantula, Tliltocatl vagans — Bug of the Week
• Nocturnal hunters: Mexican redrump tarantula, Brachypelma vagans — Bug of the Week
• Spider megacolony study breaks publicity records at Pensoft
• Monday Ménage – Brachyleptura rubrica | Beetles In The Bush
• Zookeys | Blog - Part 2