One species, P. muticus, the king baboon, and it is the slowest growing tarantula in common circulation.
Deep red-brown, thick-legged, and audible: it stridulates when threatened, producing a hiss that very few tarantulas manage. It excavates seriously, wants a foot of substrate, and will stay down for months at a stretch. Defensive when reached, with venom that produces severe local effects lasting days.
The growth rate is the entire price structure. Years to reach a large adult female, so mature specimens carry a heavy premium and slings sit near the bottom. Kenyan and Tanzanian export has tightened over time, pushing the market toward captive stock and firming prices at every size class.