Gastrobothrus quadrus is a species of beetle of the family Staphylinidae. It is found in New Zealand (North Island).
Description Adults reach a length of about . The body is reddish-brown, with the head and pronotum darker.
Life history They have been collected in leaf litter in forest remnants, as well as on a bracket fungus in nikau.
Etymology The species name is derived from Latin quadrus (meaning square) and refers to the angulate head of this species.
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