Gastrobothrus giganteus 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 mixed deciduous forests.
Etymology The species name is derived from Latin giganteus (meaning gigantic) and refers to the exceptionally large body size of this species.
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