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Family Neoephemeridae - Large Squaregill Mayfly

Neoephemera purpurea
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Ephemeroptera (Mayflies)
Suborder Furcatergalia
Infraorder Pannota
Superfamily Ephemerelloidea
Family Neoephemeridae (Large Squaregill Mayfly)
5 spp. (all Neoephemera) in our area(1), a dozen spp. in 4 genera total(2)
Mediums-sized, nymphs of most species ~10 mm, those of some up to 15-17 mm
Nymph: gills on abdominal segment 2 operculate, quadrate, fused medially; mesonotum of most species with distinct lobe anterolaterally
Holarctic & Oriental(2); in NA, eastern(1)
Found mostly in mid-sized to large rivers; often associated with root mats, submerged woody debris, or macrophytes.
Nymphs found mostly in Spring to early Summer
Thought to be collector-gatherers
Life Cycle
North American populations probably univoltine
Print References
Holland V.B., Beaty S.R., Jacobus L.M. (2016) A new species of Neoephemera McDunnough, 1925 (Ephemeroptera: Neoephemeridae) from North Carolina and Virginia. Zootaxa 4138: 139-154. (Full text)
Works Cited
1.Mayfly Central
2.The mayflies of Europe (Ephemeroptera)
Bauernfeind E., Soldán T. 2012. Brill Academic Publishers. 781 pp.