CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphies of Ochernova.

(1) Patella-tibial suture (initially present on middle and hind legs) is lost on all legs of larva, subimago and imago. Non-unique apomorphy (see Index of characters [1.2.18]).

(2) Larval legs have very long slender femora and tibiae [see (1)]. Larvae of the single species are adopted for inhabitancy inside accumulations of dead plant remainders in rivers running through sandy deserts.

Plesiomorphies of Ochernova. In larva: thoracic terga without protuberances (unlike Neoephemera/fg2); caudalii without secondary swimming setae (unlike Potamanthellus/g1). In imago and subimago: gonostyli are not diminished; median incision of penis is small (unlike Potamanthellus/g1); paracercus is well-developed (unlike Leucorhoenanthus and Potamanthellus/g1). Claw structure of male imago is unknown.