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.
Distribution and habitat The species occurs in south-eastern Queensland. The type locality is the Lamington Plateau.
Behaviour The spiders are terrestrial predators that build silken tube retreats beneath rocks and logs.
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