Definition
Brachypelma is a genus of large, terrestrial tarantulas belonging to the family Theraphosidae. Species within this genus are native to Mexico and Central America and are commonly known as Mexican red‑legged tarantulas.
Overview
The genus Brachypelma comprises approximately 15 recognized species. These spiders inhabit a range of environments, from arid scrublands to tropical forests, often seeking shelter under rocks, in burrows, or within leaf litter. Many species are popular in the pet trade due to their docile temperament, striking coloration, and relatively long lifespan. Several Brachypelma species have been listed under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) Appendix II to regulate commercial collection and protect wild populations.
Etymology/Origin
The name Brachypelma derives from the Greek words brachy meaning “short” and pelma meaning “sole” or “foot,” a reference to the relatively short and stout legs characteristic of the genus compared to other tarantulas.
Characteristics
- Size: Adult body lengths typically range from 5 to 8 cm, with leg spans up to 15 cm in larger species.
- Coloration: Many species display vivid coloration, often with bright orange or red carapaces and legs contrasted by darker, sometimes black, abdomen. The pattern varies among species; for example, Brachypelma hamorii (Mexican red‑legged tarantula) shows a deep red carapace and legs, whereas Brachypelma smithi has a more orange hue.
- Sexual Dimorphism: Males are generally smaller, have longer legs relative to body size, and possess tibial apophyses (modifications on the front legs) used during mating. Females are larger, longer‑lived, and are the primary caregivers of egg sacs.
- Behaviour: Species are primarily nocturnal ambush predators, feeding on insects, other arthropods, and occasionally small vertebrates. They are known for a defensive posture that includes raising the front legs and spreading the fangs when threatened.
- Reproduction: After mating, the female produces an egg sac containing 100–300 eggs. She guards the sac until spiderlings hatch, after which they disperse and molt several times before reaching maturity.
- Lifespan: Females can live 15–30 years in captivity, while males typically survive 4–6 years after reaching maturity.
Related Topics
- Theraphosidae – The family of tarantulas to which Brachypelma belongs.
- CITES Appendix II – International treaty listing that includes several Brachypelma species to control trade.
- Arachnid husbandry – Practices related to the captive care of tarantulas, including habitat setup, feeding, and molting.
- Conservation of Mexican arthropods – Broader efforts addressing habitat loss and overcollection affecting endemic species like Brachypelma.
- Other tarantula genera – Such as Aphonopelma and Grammostola, which share ecological niches or are also kept as pets.