CLADOENDESIS OF EPHEMEROPTERA

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(1) On fore wing [see Anagenesia/g1 (1)] MP₁ and iMP are brought together [besides the vein pairs situated anteriad of them – see Palingenia/f3=g2 (2)]. This character is especially well expressed in male, where distance between apices of MP₁ and iMP is as small as between apices of previous geminating veins (RSa₂+iRS, RSp+MA₁, iMA+MA₂) (Demoulin 1952a: Fig.4); in female distance between MP₁ and iMP can be larger. Non-unique apomorphy: the same type of gemination is present in Behningia/fg3.

Character of Cheirogenesia of unclear phylogenetic status (Table).

(2) 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 1952a: Fig.4). Non-unique apomorphy (see Index of characters [2.2.51]); among Anagenesia/g1 the same in Anagenesia/g2 and Plethogenesia; probably synapomorphy.

Plesiomorphies of Cheirogenesia (Table). At least in male imago all legs with 2 claws [blunt – see Anagenesia/g1 (2)]. In larva: on outer margin of mandibular tusk each denticle terminates by a spine-like seta [see Palingenia/f2=g1 (2)] (McCafferty & Edmunds 1976: Fig.4); outer margin of fore tibia without denticles, with spine-like setae [see Palingenia/f2=g1 (5)] (Fontaine 1968: Pl.V-VI).