- >1
1a. Median caudal filament vestigial (as in Figs. 9, 11, 29)2
- Fig. 9
- Fig. 11
- Fig. 29
1b. Median caudal filament well developed (Fig. 1, 26) 6
- Fig. 1
- Fig. 26
Heptageniidae of the World: Part II. Key to the Genera
1a. Median caudal filament vestigial (as in Figs. 9, 11, 29)2
1b. Median caudal filament well developed (Fig. 1, 26) 6
