Tailless whip scorpions, New World amblypygids, and the smaller and more available counterpart to the giant Mexican species.
No venom and no silk. They hunt with spined pedipalps and feel their way with elongated antenniform legs, moving sideways along vertical surfaces in a manner nothing else does. Flat, nocturnal, and requiring vertical cork bark rather than floor space, particularly for molting, which happens hanging.
Several species tolerate communal housing, which makes them one of the better group display animals in the hobby. Supply is a mix of wild-caught Caribbean and Central American material and modest captive breeding. Availability of specific species is inconsistent but the genus is generally around.