CLADOENDESIS OF EPHEMEROPTERA
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INDEX OF SUPRA-SPECIES TAXA NAMES: O

 Oboriphlebia/fg [fg:1980] — in pm.Permoplectoptera

 Ochernova/g [g:1998]

Ochernova/g(1) < Neoephemera/fg1

??? Oculephemera/fg [fg:2023]

Oculogaster/g [g:2016]

Oculogaster/g(1)

Offadens/g [g:1998] 

Offadens/g(1) < Baetungulata

 Olgisca/g [g:1970] — in Anteritorna INC.SED.

 Oligoneuria/fg [f:1914; g:1843]

Heptagenia/f1=Oligoneuria/g1 = Branchitergaliae < Bidentiseta

Oligoneuria/f1=g2 = Eusetisura

Oligoneuria/f2=g3 = Discoglossata

Oligoneuria/f3=g4 = Geminovenata

Oligoneuria/f4=g5

Oligoneuria/f5=g6

 Oligoneuriella/fg [f:2019; g:1924]

Oligoneuriella/fg1 < Geminovenata

Oligoneuriella/fg2

 Oligoneurioides/g [g:1955] — in Oligoneuria/f5=g6

 Oligoneuriopsis/g [g:1947]

Oligoneuriopsis/g(1) < Oligoneuriella/g1

 Oligoneurisca/g [g:1938]

Oligoneurisca/g(1) < Homoeoneuria/g1

 Oligophlebia/g [g:1965] — in Paraleptophlebia/g1

Olindinella/g [g:1990] — in Fossoriae INC.SED.

 Ommaethus/g [g:1983] — ... < Atalophlebolinguata

 Oniscigaster/fg [f:1917; g:1873]

Oniscigaster/fg1 = Vetulata < pm.Tridentiseta

Oniscigaster/fg2

 Ophelmatostoma/g [g:1987]

Ophelmatostoma/g(1) < Pseudopannota/g2

 Ordella/g [g:1923] — syn. Caenis

 Oreianthus/g [g:1931] — in Neoephemera/fg2

 Ororotsia/g [g:1939] — in Cinygmula/g1

Oriobrachys/g [fg:2008] — in Brachycercus/f1=g3

 Oumas/g [g:2000] — ... < Atalophlebolinguata

 Ounia/g [g:1981] — ... < Atalophlebolinguata

 Oxycypha/g [g:1839] — in Caenis/f6=g4