CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphies of Centroptiloides/g2.

(1) Hind wing [diminished – see Turbanoculata (10)] has peculiar shape: wide (widest among Turbanoculata), with all 3 longitudinal veins well developed, with 2 short costal projections arising separately from costal margin. In other Turbanoculata hind wing either has two costal projections arising close together or located on common base (in Afroptilum/f2=g1), or one pointed costal projection, or no pointed costal projections.

(2) Patella-tibial suture [initially present on middle and hind legs only – see plesiomorphy of Protopatellata] is either smoothed out and poorly expressed, or lost [see below, Dicentroptilum () and Centroptiloides/g3 ()]. The same in some other taxa (see Index of characters [1.2.18])

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() Larval claw sharply hooked, with 2 subapical setae (1 seta on each side); the same in some other rheophilous taxa (see Index of characters [1.2.24]); claw retains 2 rows of denticles [see Tetramerotarsata (11)] (see Index of characters [1.2.21).

Characters of Centroptiloides/g2 of unclear phylogenetic status. 

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Plesiomorphies of Centroptiloides/g2.

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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]).