CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphies of Chiloporter.

(1) Labrum [widened – see Ameletopsis/fg1 (1)] with large median incision (Kluge 2004: Fig.35:B); glossae are thickened and truncate in such a manner, that their apices are inserted into the incision of labrum (Kluge 2004: Fig.35:A).

(2) Larva is rheophilous: body is somewhat flattened dorsoventrally; head is prognathous; femora are somewhat widened; claws are strongly curved, with proximal denticle on inner margin (Kluge 2004: Fig.35:A).

(3) Larval abdominal posterolateral spines are diminished, on segment IX completely lost.

Characters of Chiloporter of unclear phylogenetic status.

(4) Each tergalius I–VII has fibrillose lobe – additional ventral lamella with long marginal processes [see Ameletopsis/fg1 (4)]; main lobe is enlarged, round, without anal rib (Demoulin 1955c: Fig.2f-i).

(5) Larval cerci with secondary swimming setae (Demoulin 1955c: Fig.2k) [unlike Mirawara – see Ameletopsis/fg1 (5)].

Plesiomorphies of Chiloporter. Gonostylus with 2 distal segments (unlike Mirawara). Imaginal and subimaginal paracercus is subequal to cerci (unlike other Ameletopsis/fg1).