Phormingochilus sp. “Ackaya” is a striking Indonesian arboreal tarantula, notable for its deep metallic blues, charcoal tones, and warm copper highlights across the carapace and legs. It’s a large, fast‑growing species within the Ornithoctoninae group, sharing the alert, high‑energy behaviour typical of Omothymus and Lampropelma. Adults often reach 18–22 cm diagonal leg span, giving them a commanding presence in a vertical enclosure.
 
In the wild, “Ackaya” is thought to inhabit humid lowland and mid‑elevation forests, living in tree hollows, bark cavities, and tight vertical retreats. This environment shapes its behaviour in captivity: it webs heavily, maintains a defined tubular hide, and reacts quickly to movement. Although defensive when pressured, it’s a reliable feeder and becomes a bold display animal once settled, often sitting at the entrance of its retreat during quiet hours.
 
Captive care centres on height, humidity, and structure. A tall enclosure with cork bark, anchor points, and good cross‑ventilation allows it to build natural webbing and feel secure. Temperatures around 24–27 °C and humidity between 70–85% suit it well, with a lightly moist substrate base to support the microclimate. For experienced keepers, Phormingochilus sp. “Ackaya” offers dramatic colour, strong arboreal behaviour, and an engaging presence that makes it one of the standout Southeast Asian species in the hobby.