CLADOENDESIS OF EPHEMEROPTERA
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Figs 19–28. Choroterpes (Dilatognathus) spp. 19–24 – Ch. (D.) bogori: 19 and 20 – apex of maxilla in pen-pen-penultimate larval instar (ventral view; tusk, ventro-apical flange and vestiges of pectinate ventral setae are shown, other setae not shown): 19 – male; 20 – female; 21 and 21 – genitals of male imago, ventral view (holotype); 23 – tergalius III (second existent); 24 – middle part of anterior margin of labrum, ventral view. 25–26 – genitals and enlarged penis of 
Choroterpides exiguus (Eaton 1884 [Thraulus]) (from Eaton 1884: Pl. 13, Fig. 20*2). 27 – Choroterpes (Dilatognathus) major, tergalius III (second existent). 28 – Choroterpes (Dilatognathus) minor, the same.