CLADOENDESIS OF EPHEMEROPTERA

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Characters of Ameletopsis/fg2 of unclear phylogenetic status.

(1) Each tergalius without fibrillose lobe [see Ameletopsis/fg1 (4)] and without anal rib.

(2) Larval cerci with secondary swimming setae [unlike Mirawara – see Ameletopsis/fg1 (5)].

(3) Imaginal and subimaginal paracercus is diminished, several times shorter than cerci (unlike Chiloporter).

Plesiomorphies of Ameletopsis/fg2. Unlike Chiloporter: Labrum [widened – see Ameletopsis/fg1 (1)] is semicircular, without median incision; glossae are flat; body form is close to siphlonuroid [if not take into account strongly enlarged specialized head – see Ameletopsis/fg1 (1)]; femora are thin, claws are slightly curved, without denticles; last abdominal segments with posterolateral spines. Unlike Mirawara, gonostylus with 2 distal segments.