(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna Bidentiseta Branchitergaliae
Heptagennota Pentamerotarsata Radulapalpata  Rhithrogena/fg1  
BleptusEpeorus/fg2IronodesEpeorus/fg3 Iron/g1 - Ironopsis/g1)

Nomen hierarchicum: Ironopsis/g1 [g:1935] (incl. Caucasiron)

In circumscription fits:

 Ironopsis/g1: Kluge 2004: 206.

References. Kluge 2004: * * *.

Autapomorphies of Ironopsis/g1.

(1) In larva long dense hairs of anterior margin of head shield [see Epeorus/fg2 (2)] are directed not anteriorly as in other Epeorus/fg2, but medially-dorsally, pressed to the head and one to another (Kluge 2004: Fig.65:I).

(2) Penis lacks latero-dorsal spines [see Pentamerotarsata (5)]. Non-unique apomorphy: these spines independently disappear in some other Radulapalpata, including some Epeorus/fg4.

Character of Ironopsis/g1 of unclear phylogenetic status. 

(3) On tergalius I anterior widening [see Iron/g1 (1)] is always widened distally (the same in some Iron/g2).

Size. Fore wing length 1020 mm.

Distribution. Holarctic.

The taxon Ironopsis/g1 is divided into:

1. Ironopsis/g2

2. Caucasiron