CLADOENDESIS OF EPHEMEROPTERA

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Characters of Chaquihua of unclear phylogenetic status.

(1) Each tergalius I–VII has no fibrillose lobe [see Ameletopsis/fg1 (4)]; narrow, with a short anal rib at proximal part of anal margin (unlike other Ameletopsis/fg1) (photo ). Tergalii retain ability of rhythmical respiratory movements (see Index of characters [1.3.30]): all pairs make slow rhythmical synchronous respiratory movements (for other Ameletopsis/fg1 this character is not examined).

(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 (photo ) (unlike Chiloporter).

Plesiomorphies of Chaquihua. Unlike Chiloporter: labrum [widened – see Ameletopsis/fg1 (1)] is nearly semicircular, with shallow median incision (photo ); 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 (photo ), claws are slightly curved; last abdominal segments have posterolateral spines. Unlike Mirawara, gonostylus with 2 distal segments.