Histeroidea

Histeridae is a family of beetles commonly known as clown beetles or hister beetles. There are more than 410 genera and 4,800 described species in Histeridae worldwide, with more than 500 species in North America. They can be identified by their shortened elytra, which leave two tergites exposed, and also by their elbowed antennae with clubbed ends. These predatory feeders are most active at night and will fake death if threatened. Hister beetles occupy almost any kind of niche throughout the world. They have also been useful for estimation of time of death during forensic investigations. Also

Histeroidea is a superfamily of beetles in the infraorder Staphyliniformia.

Syntelia is a genus of beetles. It is the only genus in the family Synteliidae. There are seven known species, which are native to high-elevation regions in southern North America from central Mexico to Guatemala, and in eastern Asia, from India to Japan and eastern Russia. They are generally associated with rotting logs, typically found under bark, though the Mexican species S. westwoodi has been found inside large decaying columnar cacti. Adults and larvae are predatory, feeding on insect larvae. A fossil species, Syntelia sunwukong, is known from the Late Cretaceous (Cenomanian) aged Burmes

Sphaerites is a genus of beetles, the only genus in the family Sphaeritidae, sometimes called the false clown beetles. There are five known species, which are widespread in temperate areas of the Northern Hemisphere, found in forested or upland areas.