Numerous, see text Leptophlebiidae is a family belonging to the Ephemeropterans that are commonly known as the prong-gilled mayflies or leptophlebiids.

[1] There are more than 650 described species[2] of Leptophlebiids, which are easily recognized by the forked gills present on the larvae's abdomen, thus their common name.

Leptophlebiid larvae live in freshwater streams and lakes eating detritus and/or algae.

North American species generally cling to rocks, few physiologically equipped for skilled swimming.

Some genera grow mandibular tusks like their burrowing relatives, the Ephemeridae, Polymitarcyidae, and Potamanthidae.