CLADOENDESIS OF EPHEMEROPTERA
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Anteropatellata, or Baetis/fg5

(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna pm.Tridentiseta  
Tetramerotarsata Liberevenata Turbanoculata - Anteropatellata)

Nomen hierarchicum: Baetis/fg5 [fg:1815] (sine Centroptiloides; incl. Cloeon)

Nomen circumscribens: Anteropatellata Kluge 1997

In circumscription fits:

— subgrex subfamm. Anteropatellata Kluge 1997

— Anteropatellata = Baetis/fg5: Kluge 2004

References. Kluge 1997: *; – Kluge 2004: *; – Kluge & Novikova 2011: * * *

Autapomorphies of Anteropatellata.

(1) Patella-tibial suture (initially present on middle and hind legs only) is equally developed on all legs of larva (Kluge 1997: Tab.11:1, 12:1), female subimago and female imago. Unlike female, on fore leg of male subimago and male imago patella-tibial suture is absent, as in other mayflies (while male larva has patella-tibial suture on fore leg).

presence of 
patella-tibial 
suture

male

female
fore
leg		 middle
leg		 hind
leg		 fore
leg		 middle
leg		 hind
leg
larva + + + + + +
subimago – + + + + +
imago – + + + + +

Similar secondary restoration of patella-tibial suture on fore leg occurs in Rhithrogena/fg3 only (see Index of characters [1.2.18]).

Among Anteropatellata, patella-tibial suture of fore leg is secondarily lost in Centroptella/g1, in connection with modification on all legs [see Centroptella (1) below] in Moribaetis/g1 [see Moribaetis () below], in Rivudiva [see Rivudiva () below], in Waynokiops [see Waynokiops (VAR) below]; in some Anteropatellata patella-tibial is lost on all legs (see Index of characters [1.2.18] and Index of characters [2.2.78.1]).

Unlike Anteropatellata, plesiomorphons Siphlaenigma, Palaeocloeon and Protopatellata have the same position of patella-tibial suture, as in most Ephemeroptera: their patella-tibial suture is retained on middle and hind legs only, being lost on fore legs of all stages and both sexes.

Size. Fore wing length 2–12 mm (see Tetramerotarsata).

Distribution. World-wide, except for New Zealand.

The taxon Anteropatellata (or Baetis/fg5) is divided into:

1. Baetovectata, or Baetis/fg6
2. Cloeon/fg1 (incl. Similicloeon, Procloeon)

3. Centroptilum

4. Baetopus/g1 (incl. Raptobaetopus)

5. Cheleocloeon

6. Afrobaetodes

Some taxa have unclear systematic position