(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna Bidentiseta Branchitergaliae
Heptagennota Pentamerotarsata Radulapalpata Heptagenia/f5=g4 
Ecdyonurus/fg1 Leucrocuta/f1=Afghanurus/g1 Leucrocuta/f2=g1 - Leucrocuta/f3=g2)

Nomen hierarchicum: Leucrocuta/f3=g2 [f:2004; g:1980] (sine Ecdyogymnurus)

In circumscription fits:

gen. Leucrocuta Flowers 1980: 297

Leucrocuta/g2: Kluge 2004: 181

References. Flowers 1980: * *; Kluge 2004: * * * *

Autapomorphy of Leucrocuta/f3=g2.

(1) Male eyes are diminished and separated dorsally by 45 times width of median ocellus (Flowers 1980: Fig.20) (unlike majority of other Heptagennota and other mayflies, where male eyes are larger and separated dorsally by width of medial ocellus or less). Non-unique apomorphy: in selected species of various taxa (including some Ecdyonurus/fg1, but not Ecdyogymnurus or Afghanurus/g2) eyes are also diminished and widely separated.

Size. Fore wing length 510 mm. 

Distribution. Nearctic.

Nominal species in Leucrocuta/f3=g2:

aphrodite McDunnough 1926 [Heptagenia]

hebe McDunnough 1924 [Heptagenia]

jewetti Allen 1966 [Heptagenia]

juno McDunnough 1924 [Heptagenia]

maculipennis Walsh 1863 [Heptagenia] typus nominis Leucrocuta

minerva McDunnough 1924 [Heptagenia]

petersi Allen 1966 [Heptagenia]

thetis Traver (in Needham & Traver & Hsu) 1935 [Heptagenia]

umbratica McDunnough 1931 [Heptagenia]

walshi McDunnough 1926 [Heptagenia]

See also:

Leucrocuta/f1=Afghanurus/g1 INCERTAE SEDIS

Ecdyonurus/fg1 INCERTAE SEDIS

Radulapalpata INCERTAE SEDIS