(1) Superlingua [curved laterally – see Heptagenia/f5=g4 (1)] with slightly concave lateral margin and rounded apex (Kluge 2004: Fig.54:B); by its form differs from any other taxon among Heptagenia/f5=g4.

(2) Glossa [see Radulapalpata (1)] with straight median margin and roundish-convex lateral margin, dorsal edge is not approximated to median edge (Kluge 2004: Fig.54:C,K-L) (unlike Heptagenia/f8=g7, Stenonema/fg1 and Ecdyonurus/fg1).

(3) 2^nd+3^rd segment of labial palp [specialized as scraping – see Radulapalpata (1)] is pointed, thus the field of scraping setae terminates at a distance from the end of the sclerotized ridge (Kluge 2004: Fig.54:D). The same in Ecdyonurus/fg1 and Rhithrogena/fg1; probably symplesiomorphy. Heptagenia/f7=g6 and Cinygma have different shape of this segment.

(4) Larval femur on its outer margin has no long hairs and long stout setae; only short stout spine-like setae and short hairs are present (Kluge 2004: Fig.54:H) [see Plesiomorphies of Heptagenia/f6=g5]. Probably plesiomorphy.

(5) Larval claws with inner margin denticulate (Kluge 2004: Fig.54:G). Probably plesiomorphy [see Pentamerotarsata (4)] (unlike all other Radulapalpata). Subapical denticles on anterior (dorsal) side of claw are also present (that is usual for many Pentamerotarsata).

(6) Tergalius VII lacks fibrillose ventral lobe, thus the fibrillose ventral lobe [see Branchitergaliae (3)] is present on tergalii I–VI only. Non-unique apomorphy (see Index of characters [1.3.59]); among Heptagenia/f5=g4 the same in Stenonema/fg1 and majority of Ecdyonurus/fg1.

(7) Tergalii are pointed apically (Kluge 1987a: Fig.8–11,17). Non-unique character.

Plesiomorphy of Kageronia. On tergalii costal and anal ribs are located on costal and anal margins correspondingly [see Branchitergaliae (3)] (unlike Stenonema/fg1).

Variable characters of Kageronia. On larval caudalii primary swimming setae [vestigial – see Pentamerotarsata (6)] can be present (in kihada [Heptagenia] and orbiticola [H.]) or lost (in fuscogrisea [Ephemera]). In imago and subimago on fore tarsus 1^st segment can be shortened (like in Heptagenia/f8=g7) (in kihada [H.] and orbiticola [H.]) or not shortened (in fuscogrisea [E.]).