Synonyms and other taxonomic changes
Previously considered a subfamily of Heptageniidae
Family contains a single species(1)
Mature nymphs and adults 10-15 mm body length
Nymph: body flattened, eyes and antennae dorsal; mouthparts adapted for predation (e.g., mandibles apically with sharp spines); tibiae and tarsi bowed, claws as long or longer than tarsi
Endemic to North America; found from intermountain west (Canada and USA) through Midwest to southeastern USA
Mid-sized to large sandy rivers
Adults emerge in mid- to late summer through most of range, earlier in southeastern USA
Nymphs are predators, thought to feed mostly on larval chironomid midges
Univoltine, first-instar nymphs emerge in late spring to early summer
Pescador M.L. (1985) Systematics of the Nearctic genus Pseudiron (Ephemeroptera: Heptageniidae: Pseudironinae). Florida Entomologist 68: 432-444.
Soluk D.A., Clifford H.F. (1984) Life history and abundance of the predaceous psammophilous mayfly Pseudiron centralis McDunnough (Ephemeroptera: Heptageniidae). Canadian Journal of Zoology 62: 1534-1539.