(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna pm.Tridentiseta  
Siphlonurus/fg1 - Siphlonurus/fg2)

Nomen hierarchicum: Siphlonurus/fg2 [f:1888; g:1868] (sine Parameletus; incl. Edmundsius).

In circumscription fits:

— subfam. Siphlonurinae: Kluge & Studemann & Landolt & Gonser 1995: 110

— Siphlonurus/fg2: Kluge 2004: 74

References. Kluge & al. 1995: *; – Kluge 2004: * * * *

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)].

Size. Fore wing length 9–24 mm.

Distribution. Holarctic.

The taxon Siphlonurus/fg2 is divided into:

1. Edmundsius

2. Siphlonurus/fg3

2.1. plesiomorphon Siphlonurus/fg4

2.2. Siphlurella