Gastrobothrus planiventris 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 brown, with the elytra yellowish-brown.
Life history They have been collected in leaf litter under pine tree, moss from a drainage ditch and in rotten wood.
Etymology The species name is derived from Latin planus (meaning flat) and ventris (meaning abdomen) and refers to the unmodified abdomen.
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