ephemeridae

Pentagenia is a genus of insect in family Ephemeridae.

E. danica, with its markings and three tails, is the most commonly seen of British Ephemeridae.

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

Robust Burrowing Mayfly,Pentagenia robusta was a mayfly in the family Ephemeridae.

In the much younger Baltic amber numerous inclusions of several modern families of mayflies have been found (Ephemeridae, Potamanthidae, Leptophlebiidae, Ametropodidae, Siphlonuridae, Isonychiidae, Heptageniidae, and Ephemerellidae).