Philonthus triangulum

Philonthus triangulum is a rove beetle in the family Staphylinidae, described by Horn in 1884. It belongs to a large genus of predatory beetles commonly found in decomposing organic matter and other habitats where small invertebrate prey is abundant. Like other members of Philonthus, it exhibits the characteristic shortened elytra and exposed abdominal segments typical of rove beetles. The species is recorded from western North America including the Pacific Northwest and southwestern United States, extending into Mexico.