CLADOENDESIS OF EPHEMEROPTERA
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Belovius/g1

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

Nomen hierarchicum: Belovius/g1 [g:1981] (incl. Albertiron) 

In circumscription fits:

— Belovius/g1: Kluge 2004: 204

References.  Kluge 2004: * * *.

Autapomorphy of Belovius/g1.

(1) On tergalii II–VII [see Epeorus/fg3 (2)] anal rib [which initially is situated on anal margin – see Branchitergaliae (3)] is situated at a distance from anal margin (Kluge 2004: Fig.65:D–E). Non-unique apomorphy.

Plesiomorphies of Belovius/g1. Unlike Iron/fg1, tergalius I [see Epeorus/fg2 (1)] is widened not so strongly, and tergalius VII has no longitudinal fold, only with smooth longitudinal concavity, which is not enough to allow tergalius to turn under abdomen (Kluge 2004: Fig.65:A).

Variable characters of Belovius/g1. Titillators are either well-developed, or vestigial, or lost.

Size. Fore wing length 10–15 mm.

Distribution. Amphipacific: Eastern Palaearctic, Oriental Region and Western Nearctic.

The taxon Belovius/g1 is divided into:

1. plesiomorphon Albertiron

2. Belovius/g2