Flat-headed-mayfly
Guides
Cinygma dimicki
Cinygma dimicki is a species of flat-headed mayfly in the family Heptageniidae, described by James Halliday McDunnough in 1934. It belongs to a genus of North American mayflies characterized by distinctive head morphology adapted for clinging to substrates in flowing water. The species is known from the Nearctic region, though specific ecological details remain poorly documented in published literature.
Maccaffertium luteum
Maccaffertium luteum is a species of flat-headed mayfly in the family Heptageniidae, originally described by Clemens in 1913. The genus Maccaffertium was historically treated as a subgenus of Stenonema but was elevated to full generic status based on morphological and phylogenetic studies. Like other members of its family, this species exhibits the characteristic subimago stage—a sexually immature winged form unique to mayflies that requires one final molt to reach reproductive adulthood.
Maccaffertium mediopunctatum
flat-headed mayfly
Maccaffertium mediopunctatum is a species of flat-headed mayfly in the family Heptageniidae. It occurs in Southeastern Canada and the Eastern United States. The species has two recognized subspecies: M. m. arwini and M. m. mediopunctatum. Like other members of its genus, it exhibits the unique mayfly developmental trait of having a fully winged subadult stage (subimago) that requires one additional molt to reach sexual maturity.
Nixe lucidipennis
clear-winged flat-headed mayfly
Nixe lucidipennis is a species of flat-headed mayfly in the family Heptageniidae, distributed across North America. The species was described by Clemens in 1913. It is known from a limited number of observations, with records indicating presence in the Nearctic region. As a member of the genus Nixe, it belongs to a group of mayflies characterized by their flattened head morphology and association with running water habitats.
Raptoheptagenia cruentata
predaceous flat-headed mayfly
Raptoheptagenia cruentata is a mayfly species originally described as Heptagenia cruentata by Walsh in 1863, later reclassified into the new genus Raptoheptagenia based on distinctive larval morphology. The genus was established because the larvae differ markedly from other Heptagenia species, having been previously misidentified as belonging to the genus Anepeorus. Adult males were successfully reared from these larvae, confirming the adult-larval association. This species belongs to the family Heptageniidae, commonly known as flat-headed mayflies.