CLADOENDESIS OF EPHEMEROPTERA

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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.7–8). 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)].