CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphies of Petersula/g1.

(1) On each tergalius [bilamellate – see Leptophlebia/fg1 (10)] each lamella is cardaic-shaped, with pointed apex and margins bearing numerous non-branched and branched filamentous processes (Kluge et al. 2022: Figs 43–48, 85–90, 130–136). Tergalii I–VI are always well-developed, tergalii VII are either much smaller (in Petersula/g2), or absent (in Ghatula). 

Characters of Petersula/g1 of unclear phylogenetic status. 

(2) Median incision of labrum is cleft-like and lacking denticles (Kluge et al. 2022: Figs 17, 73, 103) (see Index of characters [1.1.16]).

(3) Egg chorion is densely and regularly covered with two types of papillae (Kluge et al. 2022: Figs 59–62, 188–195).

Plesiomorphies of Petersula/g1.

(4) Maxilla [see Kimminsula/g1 (5)]: the subapical ventral row of comb-like setae is moderately long, less than half of maxilla width, with the lateral portion shorter than the median portion (Kluge et al. 2022: Fig.112–113) (in contrast to Kimminsula/g2).

(5) Paracercus of subimago and imago is well developed, as long as cerci (in contrast to Ceylonula).

(6) In female imago, boundary between abdominal sterna VII and VIII is straight and simple (Kluge et al. 2022: Figs 169, 207); sternum VIII just behind the genital opening has a pair of smooth fields lacking microtrichiae (in subimago) or their vestiges (in imago) which cover the rest part of abdomen (ibid.: Fig. 166) (in contrast to Kimminsula/g2).