CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphies of Hapsiphlebia/g1.

() Tergalii and abdominal segments are modified as the following. Each of two lobes of tergalii [see Leptophlebia/fg1 (10)] is wide, lamellate, with thin apical thread [in other respects their shape differs - see below, Hapsiphlebia/g2 () and Rhigotopus ()]; most posterior tergalii are reduced: either consist of one small thread-like lobe, or absent. Several anterior abdominal segments (bearing well-developed bilamellate tergalii) are shortened, and several posterior segments ... are elongated; this feature is expressed not only in larva, but in subimago and imago as well.

Characters of Hapsiphlebia/g1 of unclear phylogenetic status. 

() Glossae are projected ventrally and bent ventrally-proximally (see Index of characters [1.1.50]).

() All imaginal and subimaginal claws are pointed. Non-unique apomorphy (see Index of characters [2.2.85]).

Plesiomorphies of Hapsiphlebia/g1.

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The taxon Hapsiphlebia/g1 is divided into: