(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna pm.Tridentiseta  
Tetramerotarsata Liberevenata Turbanoculata  
Anteropatellata Baetovectata Baetungulata - Labiobaetis/f1=Pseudopannota/g1)

Nomen hierarchicum: Labiobaetis/f1=Pseudopannota/g1 [f:2016; g:1987(No.1)] (incl. Papuanatula)

In circumscription fits:

 Labiobaetis/g1: Kluge & Novikova 2011: 8.

 Labiobaetis/f1: Kluge & Novikova 2016: 3 (= "Labiobaetis/g1": Kluge & Novikova 2011).

 tribus Labiobaetini Kluge & Novikova 2016: 3.

References. Kluge & Novikova 2016: , ,

Characters of Labiobaetis/f1=Pseudopannota/g1 of unclear phylogenetic status. 

(1) In male imago sterno-styligeral muscle [see Liberevenata (4)] is completely lost (Kluge & Novikova 2016: Fig.13, 55, 81, 131). The same in some other taxa (see Index of characters [2.3.7]).

(2) In mature larva ready to moult to subimago, subimaginal gonostyli developing under larval cuticle, are folded under larval cuticle by the "Labiobaetis-type" [see Turbanoculata (13) and Baetovectata (3)]: 2nd and 3rd segments of gonostylus are directed medially and somewhat arched by convexity posteriorly, thus margin of 2nd segment represents the posteriormost part of the bud (Kluge & Novikova 2016: Fig.54, 80, 97, 130). The same in some other other taxa (see Index of characters [2.3.9]).

(3) In male imaginal gonostyli, 2nd segment has no significant widenings, 3rd (terminal) segment is short and not much narrower than 2nd segment (Kluge & Novikova 2016: Fig.13, 55, 81, 131)

(4) In larval labium, paraglossae are more or less strengthened and widened (Kluge & Novikova 2016: Fig.126). The same in some other taxa.

Size. Fore wing length 26 mm (see Tetramerotarsata).

Distribution. Holarctic, Afrotropical, Oriental and Australian Regions).

The taxon Labiobaetis/f1=Pseudopannota/g1 is divided into:

1. Plesiomorphon Labiobaetis/f2=g1  

2. Pseudopannota/g2 

3. Papuanatula/g(1)

4. Echinobaetis/g(1)

5. Mystaxiops/g(1)