CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphies of Heterocloeon.

(1) Claw with second row of denticles or at least a ridge on its place (McCafferty, Waltz, Webb & Jacobus 2005). The same secondary second row of denticles independently appeared in Andesiops/g1 (incl. Deceptiviosa); primary second row is present in Cloeon/fg1, plesiomorphon Afroptilum/f1=Centroptiloides/g2 and other taxa not belonging to Baetungulata.

() Labial palp has 2^nd+3^rd segments long and parallel-sided (muscle in 2nd segment is retained).

Characters of Heterocloeon of unclear phylogenetic status. 

() Imaginal and subimaginal anteronotal protuberance of mesonotum is sharply projected (Waltz 1994) (see Index of characters [2.2.5]). Possibly, synapomorphy with Acentrella/fg1 and/or Plauditus.

() Larva with gills in bases of fore legs (the same in some other Turbanoculata – see Index of characters [1d]).

() On larval claw, denticles of inner-posterior row are distinctly developed [being much shorter than denticles of inner-anterior row – see Baetungulata (1)] . ...?

Plesiomorphies of Heterocloeon.

Tibia without longitudinal row of setae (unlike Acentrella/fg1)