CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphies of Homoeoneuria/fg2.

(1) Larval fore leg [see Homoeoneuria/g1 (1)] has tarsus extremely diminished and claw lost (Pescador & Peters 1980: Fig.58-62).

(2) Larval abdominal sternum I in posterior part bears an unpaired finger-like process. Unique apomorphy.

(3) Tergalii [initially consisting of lamellate and fibrillose lobes – see Branchitergaliae (3)] are differentiated: tergalius I [attached ventrally – see Geminovenata (1)] consists of the fibrillose lobe only, lamella being reduced; tergalii II–VII [see Homoeoneuria/g1 (6)] are narrowed, with width no more than 1/3 length, lack fibrillose lobe.

(4) On fore wing double vein RSa+iRS [see Geminovenata (2)] is lost, i.e. there are no veins between RA and RSp+MA (non-unique apomorphy, the same in Elassoneuria/g1); crossveins are lost (Pescador & Peters 1980: Fig.1).

(5) On hind leg of male imago femur is strongly curved, inner side of trochanter, femur and tibia with tubercles; possibly, adaptation for holding female, that is connected with loss of gonostyli (Edmunds & Berner & Traver 1958).

(6) Gonostyli are lost. Non-unique apomorphy [see Geminovenata (6)]; the same in Fittkauneuria.

(7) Penis [see Geminovenata (6)] with a pair of membranous retractable tubular processes, each bearing gonopore apically (Pescador & Peters 1980: Fig.15-22).