CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphy of Siphlonurus/fg2.

(1) Tergalii I and II are bilamellate (Kluge 2004: Fig.3:A): ventral (posterior) lamella is an additional one, and represents an expanded anal-proximal lobe bent down; in Siphlonurus/fg3 this additional lamella has nearly the same shape and size as the main lamella, but unlike it has no ribs [see Siphlonurus/fg1 (7)] (tergalii III–VII are usually unilamellate, but in Siphlurella became bilamellate by another way).

Character of Siphlonurus/fg2 of unclear phylogenetic status. 

(2) Larval paraproct with a spine on inner-apical margin (Edmundsius was not examined). The same in Metretopus/fg1, Siphluriscus, Vetulata and Rallidens.

Plesiomorphies of Siphlonurus/fg2. Unlike Parameletus/fg1, larval abdominal terga (all or at least VI–X) have pointed denticles on posterior margins [sterna have no denticles – see Siphlonurus/fg1 (6)].