Origin And Natural Habitat
Brazil and Bolivia define the confirmed range of Dolichothele exilis, with the species documented across parts of both countries in the Caatinga and adjacent dry scrubland and savanna habitats of northeastern and central Brazil. The Caatinga is one of Brazil’s most distinctive biomes — a seasonally dry tropical forest characterised by thorny, drought-adapted vegetation, rocky terrain, and a strongly seasonal climate with a pronounced dry season and a concentrated wet season that triggers intense biological activity. It is the same broad bioregion that has produced several of the Dolichothele genus species, whose collectively slim, fast, metallic character reflects adaptation to the dry, sun-exposed conditions of the Brazilian interior plateau and its border zones.
The former scientific name Oligoxystre caatinga — under which this species circulated in the hobby before its transfer to Dolichothele — directly references the Caatinga biome as the primary habitat, and understanding that name gives the most immediate habitat insight available. The Caatinga is drier, more seasonally variable, and more open than the Atlantic Forest and Cerrado habitats of southeastern Brazil, producing a species adapted to hotter, more arid surface conditions with well-drained soils and the sparse thorny vegetation characteristic of northeastern Brazil’s interior.
D. exilis holds the remarkable distinction of being the type species of the genus Dolichothele itself — first described by Mello-Leitão in 1923, the species around which the entire genus concept was built. This means every other Dolichothele species, including the celebrated Brazilian Blue Beauty (D. diamantinensis), is classified in relation to this founding species — a taxonomic distinction that gives the understated Exilis Bronze a significance within the genus that its modest hobby profile does not immediately suggest.
Scientific Classification
First described by Mello-Leitão in 1923 as the founding species of the genus Dolichothele, the species subsequently passed through the synonym genus Oligoxystre under the name Oligoxystre caatinga Guadanucci, 2007 — the name under which most early hobby keeper documentation was filed — before being restored to Dolichothele exilis in the taxonomic revision that also consolidated the Oligoxystre synonymy. Keepers searching for care information may find more resources under the former Oligoxystre caatinga name. The World Spider Catalog and iNaturalist confirm D. exilis Mello-Leitão, 1923 as the current valid name.
Species Overview
Dolichothele exilis sits in an interesting hobby position — a lesser-known but increasingly admired species celebrated for its metallic hues, shy nature, and compact size within a genus whose most famous member, the Brazilian Blue Beauty, draws the vast majority of collector attention. Where D. diamantinensis offers a chromatic fireworks display of blues, greens, and reds, D. exilis offers something more understated — a bronze to copper-toned carapace and legs that shimmer subtly under light, giving it a refined, understated beauty. The keeper recommendation from Arachnoboards is to keep it similarly to D. diamantinensis but perhaps slightly more moist — reflecting the Caatinga’s slightly more moderate moisture character compared to the pure rocky savanna of the Brazilian Blue Beauty’s Minas Gerais range. Beginner to intermediate experience is appropriate given the small size and fast speed of slings.
Appearance And Size
The bronze quality is the defining visual characteristic — a bronze to copper-toned carapace and legs that shimmer subtly under light, giving the spider the warm metallic sheen that earned it the Exilis Bronze common name. This is not a single vivid colour but a complex metallic quality that shifts between warm brown, copper, and bronze depending on the lighting angle — an iridescence that rewards close observation rather than delivering its impact at a distance. The slim profile and delicate appearance belie its quick reflexes and reclusive behaviour — the Dolichothele genus character of slim, long-legged athletic build is fully present here and gives the spider an elegant, spare appearance compared to the stockier terrestrials that dominate most keeper collections.
A smaller species than D. diamantinensis — described as a medium-sized Dolichothele but smaller than the Brazilian Blue Beauty — adult females likely reach 2 to 3 inches in diagonal legspan based on the genus character and the descriptions available in keeper documentation. Described by one vendor as another beautiful mid-sized species from Brazil — the mid-sized characterisation within the Dolichothele genus context places it as compact rather than genuinely large.
Housing
A small terrestrial enclosure appropriate for a small to medium Dolichothele species, with anchor points for webbing — like D. diamantinensis, this species webs heavily and benefits from cork bark, branches, and fake plants to anchor the elaborate silk architecture it constructs. A footprint of 8 by 8 to 10 by 10 inches suits adults, with 2 to 3 inches of substrate and height giving some vertical room for upward webbing. A latching lid is essential given the speed documented for this and all Dolichothele species. Our best tarantula enclosure guide covers formats appropriate for small Brazilian dwarf terrestrial species, and our best tarantula sling enclosure guide covers secure small vial formats for fast-moving slings.
Enclosure’s Decorations
Cork bark at substrate level and extending upward, with fake plants and branches providing additional webbing anchor points throughout. A shallow water dish provides hydration for specimens of appropriate size. The Caatinga character of the natural habitat — thorny scrub vegetation over rocky soil — can be approximated with cork bark pieces of varying sizes and minimal additional decoration. Our best tarantula cork bark and best tarantula fake plants guides cover appropriate structures for small Brazilian dry-scrub terrestrial webbing species.
Substrate
Two to three inches of substrate appropriate for the Caatinga dry scrubland habitat — slightly more moist than for D. diamantinensis but still fundamentally dry-adapted rather than tropical humid. A coconut coir and sand blend or a cactus mix-style substrate gives the well-draining character appropriate for the seasonally arid Caatinga soils. The substrate should be maintained dry at the surface with the occasional moisture provided by a corner misting or water dish overflow reflecting the wet season character of the natural climate. Our best tarantula substrate guide covers dry to lightly moist blends appropriate for Brazilian Caatinga dwarf terrestrial species.
Water And Humidity
A shallow water dish for specimens over 1 inch, refreshed every two to three days. Moderate humidity of 60 to 70 percent is appropriate — slightly more than the pure dry scrubland approach appropriate for D. diamantinensis and reflecting the Caatinga’s character as dry tropical forest rather than pure desert. A hygrometer confirms actual conditions, and a misting bottle handles occasional corner moisture additions reflecting the Caatinga wet season character.
Heating And Temperature
The Brazilian Caatinga and adjacent habitats maintain warm temperatures year-round with hot dry season peaks. A captive range of 75 to 82°F suits this species well, consistent with the warm Caatinga plateau conditions. Most temperate indoor environments provide appropriate conditions without supplemental heat for much of the year. A side-mounted heat mat controlled by a thermostat handles cooler periods. A thermometer at enclosure level confirms actual conditions.
Diet And Nutrition
Appropriately sized small crickets, dubia roaches, and other prey weekly for adults — the Dolichothele genus character of strong feeding response driven by the sparse prey opportunities of dry scrubland wild habitats applies to this species as to its more famous genus relative. Remove uneaten prey within 24 hours. Our best tarantula food guide covers feeder sizing relevant to small Brazilian dry scrubland dwarf terrestrial species.
Compatibility
Solitary only. As the type species of the entire Dolichothele genus — the founding species around which the genus concept was built — any captive breeding contributes to the hobby’s understanding of a taxonomically significant Brazilian spider that remains almost entirely undocumented from keeper experience.
Behavior And Temperament
Skittish and reclusive, often retreating into burrows or hides, making it best suited for quiet enclosures where observation is passive rather than frequent — a characterisation that places it at the shier end of the Dolichothele temperament spectrum. Generally non-aggressive, relying on speed and retreat rather than urticating hairs or displays. The urticating hair status of this species requires clarification — while D. diamantinensis lacks urticating hairs entirely, the Dolichothele genus broadly may carry them in some species, and the specific urticating hair status of D. exilis should be treated cautiously until confirmed by keeper documentation.
Handling
Not recommended given the small adult size where fall risk is significant and the skittish reclusive temperament that makes controlling a fast-moving small spider during handling practically challenging. The bronze metallic sheen is best appreciated through the enclosure glass during quiet observation periods when the spider is above ground near its retreat. Venom is presumed medically insignificant to healthy humans as a New World species.
Health And Lifespan
Lifespan data is not established from captive records given the near-absence of keeper documentation for this species. Based on the genus character and adult size, females likely live 8 to 12 or more years. The dry Caatinga habitat conditions are the most important care consideration — chronic excess moisture for a species from one of Brazil’s driest biomes is more harmful than beneficial. Our tarantula dehydration article covers the opposite concern for dry-climate Brazilian dwarf species.
Price
Available from specialist vendors with limited regularity given the sparse hobby presence. Juice’s Arthropods has stocked this species, and The Spider Shop lists it periodically in the European hobby. When available, slings typically sell for $30 to $60 USD. Confirmed adult females, being genuinely rare given the limited captive breeding, command $80 to $150 or more. Source captive-bred specimens only — Brazil and Bolivia both have wildlife protection legislation, and the Caatinga biome faces ongoing habitat pressure from agricultural expansion. Everything needed to provide appropriate Brazilian Caatinga conditions for this understated metallic dwarf is on our best tarantula products page.