(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna Bidentiseta Furcatergaliae  
Fimbriatotergaliae Caenotergaliae Neoephemera/fg1 - Neoephemera/fg2)

Nomen hierarchicum: Neoephemera/fg2 [f:1935; g:1925] (sine Ochernova, Leucorhoenanthus, Potamanthellus; incl. Oreianthus)

In circumscription fits:

subgen. Neoephemera : Demoulin 1961: 57;

gen. Neoephemera McDunnough 1925: 168;

 subfam. Neoephemerinae: Needham & Traver & Hsu 1935: 288

 Neoephemera/fg2: Kluge 2004: 275

Nominal taxon included: Oreianthus/g [g:1931]

References. Traver 1931 (Oreianthus): ' '; Needham & Traver & Hsu 1935: * *; Berner, 1956: * *; Edmunds & Jensen & Berner 1976: * *; Kluge 2004: * * * *

Autapomorphies of Neoephemera/fg2.

(1) Larval thoracic terga with more or less expressed protuberances; these are: a pair of submedian protuberances on anterior part of pronotum on the crest bordering collar [see Fimbriatotergaliae (1)]; a pair of submedian protuberances on anterior part of mesonotum on the crest bordering collar [see Caenotergaliae (5)]; and an unpaired protuberance near posterior margin of mesonotum. Non-unique apomorphy; variable dorsal protuberances occur in some other mayflies, but not in other Neoephemera/fg1.

Plesiomorphies of Neoephemera/fg2. Unlike Potamanthellus/g1, larval caudalii without secondary swimming setae. In imago and subimago all claws are ephemeropteroid, including male fore legs. Gonostyli are not diminished, median incision of penis is small (unlike Potamanthellus/g1). Imaginal paracercus is well-developed (unlike Leucorhoenanthus and Potamanthellus/g1).

Size. Fore wing length 817 mm. 

Distribution. Eastern Nearctic.

Nominal species in Neoephemera/fg2: 

bicolor McDunnough 1925 [Neoephemera]

compressa Berner 1956 [Neoephemera]

eatoni Holland & Beaty & Jacobus 2016 [ Neoephemera]

purpureus Traver 1931 [Oreianthus]

youngi Berner 1953 [Neoephemera] -,

See also: 

Neoephemera/fg1 INCERTAE SEDIS