Arbanitis crispus is a species of armoured trap-door spider in the family Idiopidae, and is endemic to New South Wales.
It was first described by Władysław Kulczyński in 1908 as Dyarcyops birói.[1] [2] In 2017, Michael Rix and others transferred it to the genus, Arbanitis.[1] The species epithet honours Ludovico Biro from whose collection it was described.