Bymainiella terraereginae is a species of funnel-web spider in the Hexathelidae family. It is endemic to Australia. It was described in 1976 by Australian arachnologist Robert Raven.[1]
The species occurs in south-eastern Queensland. The type locality is the Lamington Plateau.[1]
The spiders are terrestrial predators that build silken tube retreats beneath rocks and logs.[1]