(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna Bidentiseta Furcatergaliae  
Fimbriatotergaliae Fossoriae Cryptoprosternata Palingenia/f2=g1
PentageniaPalingenia/f3=g2 Anagenesia/g1 - Plethogenesia)

Nomen hierarchicum: Plethogenesia/g1 [g:1920]

In circumscription fits:

gen. Plethogenesia Ulmer 1920b: 102

Plethogenesia/g1: Kluge 2004: 256

Nominal taxon included: Tritogenesia/g [g:1923]

References. Lestage 1923a: ; Ulmer 1939: ; Demoulin 1965b: ; 1966b: ; Kluge 2004:

Characters of Plethogenesia of unclear phylogenetic status (Table).

(1) Cubital field of fore wing [see Anteritorna (1)] includes a strong convex vein "CuA2" arising from CuA to basitornal margin and looking as a branch of CuA; a single intercalary "iCuA" is situated between "CuA2" and the distal part of CuA (Demoulin 1965b: Fig.78). Non-unique apomorphy (see Index of characters [2.2.51]); among Anagenesia/g1 the same in Anagenesia/g2 and Cheirogenesia; probably synapomorphy.

(2) Denticles on outer margin of mandibular tusk [see Palingenia/f2=g1 (2)] are large and integral, without terminal spine-like setae; sometimes these denticles are retained on tusk vestiges of imago (Demoulin 1965b: Fig.7p). The same in Palingenia/f4=g3 and Mortogenesia.

Plesiomorphies of Plethogenesia (Table). On fore wing MP1 and iMP are not brought together (unlike Cheirogenesia). At least in male imago all legs with 2 claws [blunt see Anagenesia/g1 (2)]. In larva outer margin of fore tibia without denticles, with spine-like setae [see Palingenia/f2=g1 (5)].

Size. Fore wing length 1629 mm. 

Distribution. New Guinea.

Nominal species in Plethogenesia/g1: 

bibisica Lestage 1923 [Tritogenesia]

delicata Demoulin 1965 [Plethogenesia]

lieftincki Demoulin 1965 [Plethogenesia]

pallida Demoulin 1965 [Plethogenesia]

papuana Eaton 1879 [Palingenia]