Origin And Natural Habitat
Brazil is the confirmed home of Dolichothele mineirum — a species from the rocky grasslands and dry scrubland habitats of southeastern Brazil that shares the broader Minas Gerais bioregional context with the Brazilian Blue Beauty (D. diamantinensis), the most famous member of the genus. The name mineirum itself references Minas Gerais — the Brazilian state whose name means “General Mines” in Portuguese, a region of extraordinary biodiversity, rocky plateau terrain, and the rupestrian grassland habitats that have produced several remarkable and highly sought-after Dolichothele species.
The rupestrian grassland habitat of Minas Gerais is characterised by rocky terrain, significant seasonal variation in rainfall, wide temperature swings between wet and dry seasons, and the sun-exposed, well-drained soils that produce a spider fauna adapted to periods of genuine aridity followed by wet season abundance. This habitat context informs the care profile directly — a species from the seasonally dry rocky grasslands of southeastern Brazil is not a tropical rainforest animal, and the dry substrate approach appropriate for its natural environment reflects that reality.
An important note about identification that any keeper should understand before sourcing this species. Keeper accounts document genuine uncertainty about whether pet trade specimens sold as D. mineirum represent the correctly identified species or are in fact Dolichothele rufoniger — a closely related Dolichothele species with similar purple colouration that is also known as the Brazilian Purple Beauty. The two species are morphologically similar, both carry the purple dwarf beauty character, and hobby specimens have not always been formally confirmed to species level. The care framework described here applies to both species given their shared habitat and genus character.
Scientific Classification
Dolichothele mineirum belongs to the genus Dolichothele — the small Brazilian and Bolivian genus that also includes the Brazilian Blue Beauty (D. diamantinensis) and Exilis Bronze Tarantula (D. exilis). The genus is characterised by small to medium adult size, fast growth, heavy webbing behaviour, slim athletic build, and in several species the complete absence of urticating hairs that makes them distinctive among New World terrestrials. The World Spider Catalog and iNaturalist confirm D. mineirum as a valid species within the Dolichothele genus.
Species Overview
This is the purple version of D. diamantinensis — a characterisation that captures the Purple Dwarf Beauty’s hobby position precisely. Where the Brazilian Blue Beauty delivers metallic blue, green, and red on a compact dwarf frame, D. mineirum delivers deep purple on the same compact dwarf frame with the same prolific webbing behaviour, the same fast growth rate, the same aggressive feeding response, and the same complete absence of urticating hairs that makes the entire Dolichothele genus distinctive within the New World. For keepers who already love their D. diamantinensis and want to add the purple complement to their collection, this is the natural next acquisition. Defensive and fast — intermediate keeper experience is appropriate given the speed, though the care requirements themselves are straightforward.
Appearance And Size
The colour development journey from sling to adult is genuinely extraordinary and one of the most celebrated aspects of keeping this species. As spiderlings, they typically start brown and transition to glowing orange or red tones before reaching their adult purple colouration — a developmental sequence that makes even the juvenile stages visually engaging and gives the grow-out a progressive colour journey comparable to the Avicularia genus in terms of instar-to-instar transformation. The deep purple of the settled adult — a rich, dark, metallic purple that shifts with light angle — is genuinely stunning at close range in a way that photographs can suggest but rarely fully convey. The slim, athletic Dolichothele build gives the spider an elegant quality that contrasts pleasingly with the more stocky build of typical terrestrial species. Like all members of the genus Dolichothele, this species lacks urticating hairs — a characteristic visible in the adult’s behaviour during disturbance when it bolts rather than hair-kicks.
Adult diagonal leg span reaches approximately 3 inches — semi-dwarf territory with adults typically reaching 3 to 3.5 inches. Growth rate is exceptionally fast, maturing much quicker than many other tarantula genera — which combined with the early colour development visible in juveniles makes this one of the more rewarding small species to raise from sling.
Housing
A small terrestrial or semi-arboreal enclosure with anchor points for the heavy webbing this species constructs. They are heavy webbers that create intricate tunnel systems — a small enclosure of 8 by 8 to 10 by 10 inches suits adults at 3 to 3.5 inches legspan, with 2 to 3 inches of substrate and enough height for webbing to extend upward from the substrate surface. Cork bark and branches reaching upward from the substrate give anchor points for the silk architecture that makes Dolichothele enclosures so visually interesting over time. A latching lid is non-negotiable given the speed of this species. Leaning a piece of cork against the side of the enclosure gives the spider a surface to web behind rather than weaving directly against the lid — a practical approach that reduces the disturbance of enclosure access. 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 the fast-moving early instars.
Enclosure’s Decorations
Cork bark positioned both at substrate level and vertically, fake plants, and branches provide the anchor points this heavy webbing species will exploit immediately. Providing anchor points like cork bark or vertical branches is essential for their webbing. A shallow water dish provides hydration. The rocky grassland character of the Minas Gerais rupestrian habitat can be approximated with flat stones and cork pieces. Our best tarantula cork bark and best tarantula fake plants guides cover appropriate structures for Brazilian dwarf semi-terrestrial webbing species.
Substrate
Two to three inches of dry to moderately moist substrate appropriate for the seasonally variable rupestrian grassland habitat of Minas Gerais. Keep the substrate mostly dry for adults with a moisture gradient toward the lower layers — the seasonal dry period of the Brazilian rocky grassland produces genuinely arid surface conditions that the spider manages through its webbed retreat rather than through burrowing into moist soil. A coconut coir and sand blend gives appropriate drainage and structure. Our best tarantula substrate guide covers dry to lightly moist blends appropriate for Brazilian rocky savanna dwarf species.
Water And Humidity
A shallow water dish for specimens over 1 inch, refreshed every two to three days. They benefit from a moisture gradient — mostly dry with occasional corner misting reflecting the wet season rainfall pulse character of the Minas Gerais rupestrian grassland. Moderate ambient humidity of 60 to 70 percent is appropriate — more moderate than continuously humid tropical species and reflecting the genuinely seasonal and variable climate of southeastern Brazil. A hygrometer confirms actual conditions, and a misting bottle handles targeted corner moisture additions.
Heating And Temperature
The rupestrian grasslands of Minas Gerais experience warm temperatures with meaningful seasonal variation. Warmer temperatures in the 75 to 82°F range produce faster growth and more frequent moults — a captive range consistent with the warm Brazilian 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 similar prey weekly. Like its blue counterpart, this species has an amazing feeding response — the Dolichothele genus character of aggressive pursuit of prey driven by the sparse prey opportunities of dry Brazilian habitats makes every feeding genuinely engaging regardless of the small adult size. Slings start on hatchling feeders from the earliest instars. Remove uneaten prey within 24 hours. Our best tarantula food guide covers feeder sizing relevant to active dwarf Brazilian savanna terrestrial species.
Compatibility
Solitary only. The complete absence of urticating hairs means mating introductions require particular care — neither the male nor the female has hair-kicking as a defensive intermediate, and a defensive response from either specimen goes directly to speed and potentially biting. A well-fed female and supervised introduction are essential.
Behavior And Temperament
Defensive and fast — the Dolichothele genus character applied to a purple-hued spider that builds elaborate webbing throughout its enclosure and has an impressive feeding response that rewards patient observation. Not typically aggressive but preferring to bolt at high speeds when disturbed — the speed is the primary keeper management challenge rather than defensive intensity per se. They will build a web hammock right against the lid — which makes enclosure access potentially disruptive, and the cork-leaning strategy of providing an alternative webbing surface against the enclosure wall rather than the lid is the practical solution. Urticating hairs are absent — like other members of the genus Dolichothele, this species does not flick irritating bristles.
Handling
Not recommended given the small adult size, exceptional speed, and defensive fast-bolting temperament. The deep purple colouration is best appreciated through the enclosure glass during quiet observation and feeding interactions. Venom is medically insignificant to healthy humans as a New World species.
Health And Lifespan
Lifespan is not precisely documented from captive records. Based on the genus character and adult size, females likely live 8 to 12 or more years. The exceptionally fast growth rate means health monitoring through regular feeding and abdomen condition gives responsive data across the relatively quick path to adult size. The primarily dry substrate requirement is the most important ongoing health consideration. Our tarantula dehydration article covers the opposite concern for dry-climate Brazilian dwarf species.
Price
Available from specialist vendors with limited regularity given the rarity of this species relative to the more commonly captive-bred Brazilian Blue Beauty. Exotics Unlimited and Buddha Bugs are among vendors stocking this species. Slings typically sell for $50 to $100 USD reflecting the genuine rarity. Confirmed adult females command $120 to $200 or more. Source captive-bred specimens only and verify species identification with the seller given the known hobby confusion between D. mineirum and D. rufoniger — both species are genuine and rewarding, but knowing which one you have is worthwhile from both an identification and provenance perspective. Brazil has wildlife protection legislation, and responsible captive sourcing is both legally and ecologically the correct approach. Everything needed to provide appropriate Brazilian rocky savanna conditions for this purple dwarf is on our best tarantula products page.