(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna Bidentiseta Furcatergaliae  
Fimbriatotergaliae Caenotergaliae Caenoptera Caenis/f3=g1
MadecocercusCaenis/f4=g2 - Caenis/f5=g3)

Nomen hierarchicum: Caenis/f5=g3 [f:1853; g:1835] (sine Tillyardocaenis; incl. Brasiliocaenis, Clypeocaenis, Caenopsella)

In circumscription fits:

 Caenis/f5=g3: Kluge 2004: 287

References. Kluge 2004: * * * *

Autapomorphy of Caenis/f5=g3.

(1) Grooves of gonostyli [see Caenoptera (5)] are lost. In a few species gonostyli retain bowed shape and strong musculature: in Australian species Caenisf6=g4 tonnoiri [Tasmanocoenis] and dostini [Wundacaenis], as well as in a similar undescribed species from Thailand, gonostyli resemble that of Tillyardocaenis, but without grooves; in Palaearctic species rivulorum [Caenis] and some others gonostyli are also strong and bowed. In majority of Caenis/f5=g3 (including the type species of Caenis) gonostyli are more straight, less sclerotized, with weak muscles, apically often with a thin projection or a bunch of spines; it some species gonostyli are vestigial, non-functional, shorter than penis.

Size. Fore wing length 28 mm.

Distribution. World-wide.

The taxon Caenis/f5=g3 is divided into:

1. large heterogenous plesiomorphon Caenis/f6=g4

2. Brasiliocaenis 

3. Clypeocaenis/g1

3.1. plesiomorphon Amercaenis

3.2. Clypeocaenis/g2

3.2.1. plesiomorphon Barnardara

3.2.2. Clypeocaenis/g3

4. Caenopsella/g1
4.1. plesiomorphon Afrocaenis

4.2. Caenopsella/g2