CLADOENDESIS OF EPHEMEROPTERA
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Eurylophella/fg1

(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna Bidentiseta Furcatergaliae  
Ephemerella/fg1Tricorythus/fg1Ephemerella/fg2 Timpanoga/fg1AttenellaTimpanoga/fg2 - Eurylophella/g1)

Nomen hierarchicum: Eurylophella/fg1 [f:2000; g:1935] (incl. Dentatella)

In circumscription fits:

— subgen. Eurylophella: McCafferty 1978: 138;

— gen. Eurylophella: McCafferty & Wang 1994a: 574;

— tribus Eurylophellini McCafferty 2000: 158;

— Eurylophella/fg1: Kluge 2004: 302

References. McCafferty & Wang 1994a (gen.): *; – Kluge 2004: * * *

Autapomorphies of Eurylophella/fg1.

(1) Tergalius IV [gill operculum – see Timpanoga/fg2 (1)] is oval, with distal margin not truncate and not incised [see Ephemerella/fg2 (2)]; these gill opercula completely or nearly completely cover the rest of tergalii (Kluge 2004: Fig.91:I). Non-unique apomorphy.

Plesiomorphy of Eurylophella/fg1. Unlike Timpanoga/fg3, larval claws with a row of denticles on inner margin [see Ephemerella/fg1 (18)].

Size. Fore wing length 6–11 mm.

Distribution. Mainly Nearctic, also in Europe.

The taxon Eurylophella/fg1 is divided into:

1. plesiomorphon Dentatella

2. Eurylophella/fg2