CLADOENDESIS OF EPHEMEROPTERA
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Plesiomorphon Hexagenia/fg3

(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna Bidentiseta Furcatergaliae  
Fimbriatotergaliae Fossoriae Ephemera/fg9 Hexagenia/fg1Eatonica/g1Hexagenia/fg2 - pm.Hexagenia/fg3)

Nomen hierarchicum: Hexagenia/fg3 [f:1991; g:1863] (sine Pseudeatonica) 

In circumscription fits:

— subgen. Hexagenia: McCafferty 1970: 225

— gen. Hexagenia: Kimmins 1960: 309

— plesiomorphon Hexagenia/fg3: Kluge 2004: 241

References. Needham & Traver & Hsu 1935: * *; – Edmunds & Jensen & Berner 1976 (subgen.): * *; – McCafferty 1970: *; – 1975: *; – 1979b: *; – Kluge 2004: * * *

Plesiomorphy of Hexagenia/fg3. Imaginal and subimaginal gonostylus with 2 distal segments (unlike Pseudeatonica and some of Eatonica/fg1). Only in selected specimens of Hexagenia/fg3 distal segments of gonostyli are separated indistinctly or fused one with another.

Size. Fore wing length 10–25 mm.

Distribution. Nearctic; probably also Palaeogene of Palaearctic (see Denina in Ephemera/fg9 INCERTAE SEDIS).

Nominal species in Hexagenia/fg3:  

affiliata McDunnough 1927 [Hexagenia] — syn.subj. limbata [Ephemera]

angulata Walker 1853 [Baetis] — syn.subj. limbata [Ephemera]

atrocaudata McDunnough 1924 [Hexagenia]

bilineata Say 1824 [Baetis]

californica Upholt 1937 [Hexagenia] — syn.subj. limbata [Ephemera]

carolina Traver 1931 [Hexagenia] — syn.subj. limbata [Ephemera]

elegans Traver 1931 [Hexagenia] — syn.subj. limbata [Ephemera]

falcata Needham 1921 [Hexagenia bilineata]  

kanuga Traver 1937 [Hexagenia] — syn.subj. limbata [Ephemera]

limbata Serville (in Guerin) 1829 [Ephemera] — typus nominis Hexagenia ,,/

marilandica Traver 1931 [Hexagenia] — syn.subj. limbata [Ephemera]

mingo Traver 1931 [Hexagenia] — syn.subj. limbata [Ephemera]

munda Eaton 1883 [Hexagenia] — syn.subj. limbata [Ephemera]

occulta Walker 1853 [Palingenia] — syn.subj. limbata [Ephemera]

orlando Traver 1931 [Hexagenia]

pallens Traver (in Needham & Traver & Hsu) 1935 [Hexagenia] — syn.subj. limbata [Ephemera]

rigida McDunnough 1924 [Hexagenia]

rosacea Traver 1931 [Hexagenia] — syn.subj. limbata [Ephemera]

variabilis Eaton 1883 [Hexagenia] — syn.subj. limbata [Ephemera]

venusta Eaton 1883 [Hexagenia] — syn.subj. limbata [Ephemera]

viridescens Walker 1853 [Palingenia] — syn.subj. limbata [Ephemera]

weewa Traver 1931 [Hexagenia] — syn.subj. limbata [Ephemera]