CLADOENDESIS OF EPHEMEROPTERA

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Autapomorphies of Callibaetis/fg2.

(1) Tergalii have costal rib moved far from costal margin; anal rib [initially situated on anal margin – see Tetramerotarsata (12)] is lost – thus margins of tergalii are not bordered by ribs; all or several anteriormost tergalii with a separated anal-proximal lobe curved to ventral side. Among Tetramerotarsata, besides Callibaetis/fg2, reduction of anal rib and ventral curvation of the anal-proximal lobe takes place only in Crassabwa; in Cloeon/fg1, anal lobe is similarly curved dorsally (see Index of characters [1.3.24]). 

(2) In larva, on fore claw denticles [situated in 2 rows – see Tetramerotarsata (11)] are longer than on middle and hind ones. Unique apomorphy.

(3) Viviparous. The same in Cloeon/fg2 and Oculogaster.

Characters of Callibaetis/fg2 of unclear phylogenetic status. 

Plesiomorphies of Callibaetis/fg2.