Tliltocatl

Species of Tliltocatl are relatively large. A female T. vagans, for example, may have a total body length of more than 50 mm (2.0 in) and a maximum leg length of over 55 mm (2.2 in).[3] The carapace is about as long as wide, the sternum being longer than wide. The first leg is the longest. All four legs have undivided scopuli on the tarsus. Stridulating hairs are present on the retrolateral face of the trochanter of the pedipalp and on the prolateral face of the trochanter and femur of the first leg. Sexually mature males have two tibial apophyses, the retrolateral one being slightly curved at the end.[2]

The genus Tliltocatl shares many features with Brachypelma. For example, both genera have stridulating hairs in the same locations. Both have type I and type III urticating hairs on the rear of their abdomens, with type I surrounding type III. Their male palpal bulbs are similar, being spoon-shaped at the end. Females have a single fused spermatheca with an absent or weakly developed baseplate. Tliltocatl species differ from Brachypelma in coloration. Their legs are blackish, without red rings. Their carapaces are mostly dark, without detailed red markings, and they have long red or yellowish hairs on their abdomens. The patellae of the palps and legs have spines. The detailed shapes of the genitalia also differ between the two genera.[2]

• Comparison of typical Tliltocatl and Brachypelma species
• 
  Tliltocatl cf. sabulosum
• 
  Brachypelma boehmei

The genus Tliltocatl was erected by Mendoza and Francke in 2020, following a number of molecular phylogenetic studies showing that, as previously circumscribed, Brachypelma was not monophyletic, consisting of two distinct clades.[2] A study in 2017 had identified the "red leg" and "red rump" clades, treating the "red leg" group as Brachypelma s.s..[4] The previously identified "red rump" clade was then separated as the genus Tliltocatl.[2] The genus name is derived from two Nahuatl words, tlil meaning 'black' and tocatl meaning 'spider', and is masculine.[2]

Distribution of confirmed specimens of Tliltocatl species[2]

Tliltocatl species are native to Mexico and Central America. The precise distribution of some species is uncertain, partly because they were described from pet trade specimens. For example, T. kahlenbergi was described from specimens that had originally been sent to Germany for this purpose from Veracruz in Mexico.[5] A map of confirmed specimens produced by Mendoza and Francke (2020) shows Mexico, Guatemala, Belize, Nicaragua and Costa Rica,[2] a distribution largely supported by the World Spider Catalog.[1] In the text, Mendoza and Francke add Honduras and El Salvador. Species occur both in the west (the Pacific coast) and the east (the Atlantic Coast and the Gulf of Mexico). They are found in a variety of habitats, including deciduous forest, evergreen rain forest and grasslands. They live in burrows, which may be under objects such as rocks, logs and tree roots. Some species dig burrows in farmlands and gardens.[2]

Habitat destruction and collection for the pet trade led to the genus Brachypelma, then including Tliltocatl, being among the few arthropods protected under international Convention on International Trade of Endangered Species rules, beginning with B. smithi.[6] Large numbers of Mexican tarantulas caught in the wild continue to be smuggled out of Mexico. The threat to the less colourful species in the genus Tliltocatl is considered less severe.[2][4]