CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphies of Fittkaulus.

(1) Gonostylus has 1 apical segments [instead of two diminished ones – see Terpides/fg1 (7)]. In contrast to Terpides/fg2 and Fikuna.

Characters of Fittkaulus of unclear phylogenetic status.

(2) Dorsal lamella of tergalii II–VI with projections by sides of terminal point; ventral lamella of each tergalius without projections by sides of terminal point (Kluge 2009: Fig.6–9) [see Terpides/fg1 (18)].

(3) Subimaginal cuticle of all legs of male and female 1^st tarsomere (shortened) is covered by microtrichiae, and 2^nd–5^th tarsomeres are covered by blunt microlepides. The same in Tikuna, in contrast to Terpides/fg2, whose 1^st tarsomere of male fore leg is covered by microlrepides [about other legs – see Terpides/fg1 (10)].

(4) Subimaginal cuticle of mesonotum with contrasting brown color pattern on colorless background (Kluge 2009: Fig.14). The same in Terpides/fg2, in contrast to Tikuna.

(5) Costal projection of hind wing prominent (Kluge 2009: Fig.12-13). The same in Tikuna, in contrast to Terpides/fg2.

Plesiomorphies of Fittkaulus.

(6) Egg without two rows of plates (Kluge 2015: Fig.108–111). In contrast to Terpides/fg2.