The adults are short-lived and terrestrial, the body is broad and depressed. Some pupate underwater. Lampyridae- firefly beetles. The larvae can be aquatic or semiaquatic snail predators, they have the tergites expanded laterally. The adults are terrestrial, they have the pronotum covering the head.
Some species have luminescent lanterns.
Chrysomelidae- leaf beetles, mostly terrestrial, but the larvae of some species feeding inside submerged vascular plants. The larvae are short and obese with reduced legs. The adults are have 4 visible tarsal segments, the first 3 of which are dilated with hairy pads. Reference update Askevold, I.S. 1991. Alarie, A., P.P. Harper, and R.E. Roughley.