CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphies of Baetofemorata.

(1) In larva, each femur in its proximal part of inner side bears a villopore – a patch of small (0.02 mm long) bristles closely pressed together (Waltz & McCafferty 1987:553-568: Figs.1,4,5). Unique apomorphy. Besides Baetofemorata, similar bristles occur in some species of Labiobaetis/f2=g1, being less closely accumulated.

Characters of Baetofemorata of unclear phylogenetic status.

(2) On all legs of subimago each tarsal segment is covered mainly by blunt microlepides; only in distal part of each segment pointed microlepides can be present [as on segments 1–4 of male fore tarsus – see Baetungulata (4)]. The same in some other taxa (see Index of characters [2.2.83]).

(3) In mature larva ready to moult to subimago, buds of subimaginal gonostyli are folded under larval cuticle [see Turbanoculata (13) and Baetovectata (3)] by the "Baetis-type" or "Acentrella-type": in the both cases both 2^nd and 3^rd segments of gonostylus are directed medially. In most other Turbanoculata the gonostyli buds are directed more caudally or laterally (see Index of characters [2.3.9]).

(4) Larval antennae bases never brought together, frons between them does not form a keel (see Index of characters [1.1.3]).

(5) Prostheca of right (as well as left) mandible is always stick-shape, denticulate apically [see Turbanoculata (6)] (unlike Takobia/g1 et al. – see Index of characters [1.1.25])

(6) Inner margin of both mandibles between prostheca and mola always without setae (unlike Cloeon/fg1 et al – see Index of characters [1.1.23]).

(7) Labial palp, being 3-segmented, usually has 2^nd segment widened or with inner-apical projection [see Index of characters [1.1.58]).