Adult male Forsteropsalis bona. This species is distinguished by extremely dilated chelicera II segment, long bow-like fingers of chelicera segment III, a lack of dense plumose setae on the pedipalps (ruling out sympatric F. photophaga), denticulation of chelicera is also not hypertrophied (also rules out F. photophaga), a lack of distinct apophysis on the pedipalp (ruling out F. fabulosa), prosoma/carapace and area around ocularium (eyes) is entirely unarmed (no denticulation).

Distinguished from Forsteropsalis pureora by lack of light median stripe running down opisthosoma and disproportionally longer pedipalps in F. bona. Forsteropsalis pureora has denticulation on the prosomoa while F. bona is unarmed. Tooth shape/pattern/presence of the fingers of chelicera III is also a useful character but dilation of chelicera segment II is not reliable because of intraspecific weapon polymorphism prevalent in this family.

Collected nearby localities of holotype and paratype specimens. Collected on rock wall above stream near cave entrance.