(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna Bidentiseta Furcatergaliae  
Fimbriatotergaliae Potamanthus/fg1 - Potamanthus-fg2)

Nomen hierarchicum: Potamanthus/fg2 [f:1888; g:1843] (sine Rhoenanthus; incl. Anthopotamus)

In circumscription fits:

 gen. Potamanthus: Eaton 1871

 Potamanthus/fg2: Kluge 2004: 223

References. Eaton 18831888: *; Needham & Traver & Hsu 1935: * *; Edmunds & Jensen & Berner 1976: * *; Kluge 2004: * * * *.

Autapomorphy of Potamanthus/fg2.

(1) Penis has a characteristic shape, similar in all representatives: each penis lobe has a stretched pointed apex and a flat lateral lobe.

Character of Potamanthus/fg2 of unclear phylogenetic status. 

(2) In larva on fore femur transverse row of setae [see Potamanthus/fg1 (3)] is not expressed or poorly expressed (unlike some Rhoenanthus/g1).

Plesiomorphy of Potamanthus/fg2. Imaginal and subimaginal paracercus is not shortened (unlike some Rhoenanthus/g1).

Size. Fore wing length 715 mm.

Distribution. Holarctic and Oriental Region.

The taxon Potamanthus/fg2 is divided into:

1. Potamanthus/fg3

2. Anthopotamus