| 1 | Aedeagal shaft with two pairs of flanges (Figs 11, 18, 29, 34) | 2 |
| – | Aedeagal shaft with a pair of flanges | Membranacea unijugata Qin & Zhang |
| 2 | Aedeagal shaft with a ventral central spine (Figs 6, 11, 12, 13, 17, 18) | 3 |
| – | Aedeagal shaft without ventral central flange (Figs 29, 30, 34, 35) | 4 |
| 3 | Aedeagus with ventral central spine near apex (Figs 17, 18) | Membranacea spinata Qin & Zhang |
| – | Aedeagus with ventral central spine at or slightly beyond midlength of shaft (Figs 11, 13) | Membranacea hubeiensis Yu & Yang, sp. n. |
| 4 | Aedeagus with subapical flanges slightly broader than flanges at midlength of shaft (Figs 29, 30) | Membranacea stenoprocessa Yu & Yang, sp. n. |
| – | Aedeagus with subapical flanges distinctly narrower than flanges at midlength of shaft (Figs 34, 35) | Membranacea plana Qin & Zhang |
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