FIGURES 19–28 in Indonesian species of Dilatognathus Kluge 2012 (Ephemeroptera, Leptophlebiidae, Choroterpes s. l.) and species-specific sexual dimorphism in development of maxilla

FIGURES 19–28. Choroterpes (Dilatognathus) spp. 19–24, Ch. (D.) bogori: 19 and 20, apex of maxilla in pen-penpenultimate 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.