Brazilian Blue
Lasiocyano sazimai
The Brazilian Blue (Pterinopelma sazimai, now often Lasiocyano sazimai) is one of the best sling-to-adult transformations in the hobby — a drab little spiderling that matures into a deep metallic blue stunner flecked with red abdominal setae. From the highland 'sky islands' of Brazil, it's hardy, forgiving, famously docile, and slow to flick hairs. A terrestrial that likes moisture but not swamp, it's widely called the ideal first blue tarantula: gorgeous, gentle, and genuinely easy.
- Temperature72–80°F (22–27°C) — room temperature, no heat lamp. It's a highland species comfortable across a normal home range.
- HumidityDamp, around 70–75%, with a moisture-retaining substrate kept damp on one side and a water dish — never a swamp — plus good ventilation. Highland-forest moisture: damp gradient, drier surface, airflow. It colours up best kept properly hydrated.
- Adult sizeA medium-sized tarantula: adults reach 5–6 inches across the legs (diagonal leg span). A steady grower at a moderate pace.
- LifespanFemales roughly 12–15 years; mature males 4–5 years.
Enclosure
Terrestrial with burrowing depth — a 5–10 gallon footprint, floor space over height, substrate filled to keep falls short. Cork hide, water dish, cross-ventilation. Slings burrow; adults often adopt a hide and display that blue.
Substrate & water
4–5 inches of moisture-retaining coco/topsoil, damp on one side and drier on the other, with a water dish. Ventilate the damp base to prevent mold.
Feeding
A hardy, reliable eater. Prey to abdomen size; juveniles twice weekly, adults weekly. Not fussy. Remove uneaten prey in 24 hours.
Temperament & defenses
Beginner-friendly and famously docile — slow to flick hairs, not defensive, an easy-going display spider. Venom mild. Among the calmer terrestrials; handle minimally on principle. A great confidence species that also happens to be blue.
Keeper’s notes
Our top pick for a first blue tarantula — you get one of the hobby's most dramatic colour transformations in a hardy, gentle, forgiving package. Watching a plain sling molt into deep metallic blue with red highlights is a genuine joy. Keep the substrate damp-not-wet with a dry gradient, ventilate, and enjoy the show. Beginner-friendly beauty.