CLADOENDESIS OF EPHEMEROPTERA

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Characters of Palingenia/f4=g3 of unclear phylogenetic status (Table).

(1) Denticles on outer margin of mandibular tusk [see Palingenia/f2=g1 (2)] are large and integral, without terminal spine-like setae (Kluge 2004: Fig.76:E). The same in Mortogenesia and Plethogenesia.

(2) In larva on outer margin of fore tibia spine-like setae [see Palingenia/f2=g1 (5)] are lost and substituted by large denticles. The same in Mortogenesia.

Plesiomorphies of Palingenia/f4=g3. Vestige of tergalius I [see Cryptoprosternata (6)] is bilamellate (Soldan 1978b: Fig.20–22) (unlike Anagenesia/g1).

In imago and subimago: On fore wing bifurcation of MA is situated near middle; RSa₂' and iRSa₂ are present; many additional intercalary veins are present between paired veins RSa₂+iRS, RSp+MA₁ and iMA+MA₂ [see Palingenia/f3=g2 (2)] and other longitudinal and intercalary veins, tornoapical wing margin has no incisions (unlike Anagenesia/g1); CuA without furcation (unlike some Anagenesia/g1 – see Table) [see Anteritorna (1)]; MP₁ and iMP are not brought together (unlike Cheirogenesia) (Eaton 1883–1888: Pl.1; Demoulin 1965b: Fig.1–2; Soldan 1978b: Fig.1–2). On fore leg of male tarsus is not shortened [unlike subimago – see Palingenia/f3=g2 (3)]. In female tarsi of all legs are segmented; on middle and hind legs of male and female claws are ephemeropteroid (unlike Anagenesia/g1); male subimago moults to imago on bank attaching itself to some support by middle and hind legs (Landolt & al. 1995) [females do not moult – see Palingenia/f3=g2 (1)].