CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphies of Dicentroptilum.

() Larva has two finger-like tracheal gills arising from articulation of each fore coxa with prosternum. The same in some other taxa (see Index of characters [1d]).

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Characters of Dicentroptilum of unclear phylogenetic status. 

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() Patella-tibial suture [vestigial, on middle and hind legs only – see Centroptiloides/g2 ()] on larval legs is lost, on legs of winged stages smoothed out. The same in some other taxa (see Index of characters [1.2.18])

Plesiomorphies of Dicentroptilum.

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Fore wings with no more than one marginal intercalary in each space (unlike Baetovectata) [see Liberevenata (2)] (Index of characters [2.2.55]).

Before molt from larva to subimago, subimaginal gonostyli are bent under larval cuticle in «Cloeon-type» pose, i.e. with 2nd segments directed laterally. The same in most other Protopatellata and Anteropatellata-non-Baetovectata (see Index of characters [2.3.9]).