Rhoenanthus (Potamanthindus), 1930

Han, Na, Zhang, Min & Zhou, Chang-Fa, 2021, The genus Rhoenanthus Eaton, 1881 in China with the redescription of R hunanensis You & Gui, 1995 (Ephemeroptera: Potamanthidae), Zootaxa 4903 (4), pp. 563-577 : 576

Key to species of subgenus Rhoenanthus (Potamanthindus) : male imago (male of R. sapa unknown)

1 Penes relatively stout, clearly shorter than half of forceps ( Fig. 9 )............................................... 3

- Penes relatively slender, longer than or subequal to half of forceps ( Fig. 6C, 6F )................................... 2

2 Outer half wings stained with purplish brown pigments, penis forked apically in ventral view ( Fig.6 E–F).......... R. youi

- Wings stained with purplish brown pigments near leading margins and midregion ( Fig. 6 A–B); apex of penis unforked in ventral view ( Fig. 6D )......................................................................... R. hunanensis

3 Forewings with purplish brown stained markings throughout wing.................................... R. magnificus

- Forewings with purplish brown stained markings concentrating transversely in midregion and leading margin........... 4

4 Penes broad, separated........................................................................ R. coreanus

- Penes relatively slender, fused basally............................................................ R. obscurus

Figures

FIGURE 6. Male structures of Rhoenanthus spp. (digital photos). A–D. Rhoenanthus hunanensis; E–F. Rhoenanthus youi: A. Forewing; B. Hindwing; C, F. Genitalia (dorsal view); D–E. Enlarged penes (ventral view).

FIGURE 9. Genitalia of Rhoenanthus magnificus subimago.