Key to species of the segregnatha -group in China (based on male genitalia)
1 Sacculus not separated from valva....................................................................... 2
- Sacculus separated from valva distally.................................................................... 9
2 Aedeagus with compact fine spines...................................................................... 3
- Aedeagus without compact fine spines.................................................................... 5
3 Valva with a setose tuberous process at middle on ventral margin (Fig. 41)..................... M. segregnatha sp. nov.
- Valva without such a process at middle on ventral margin..................................................... 4
4 Ventral margin of valva with several denticles, produced to an apical tooth (Fig. 30)............... M. compacta sp. nov.
- Ventral margin of valva without denticles, produced to a strong free distal process (Fig. 32)............... M. flavilineata
5 Sacculus with neither denticles nor process apically......................................................... 6
- Sacculus with a process or some denticles apically.......................................................... 7
6 Ventral margin of valva with two cornuted processes apically, saccus same length as uncus (Fig. 42)..................................................................................................... M. taeniophylla sp. nov.
- Ventral margin of valva without a process apically, saccus 3/5 length of uncus (Fig. 29)............. M. circinans sp. nov.
7 Sacculus with a process apically, valva parallel-sided from base to apex (Fig. 39).................. M. parallela sp. nov.
- Sacculus with denticles apically, valva narrowed from base to obtuse apex, or widened medially...................... 8
8 Valva narrowed from base to obtuse apex, saccus pointed at apex (Fig. 25)........................ M. acutata sp. nov.
- Valva widened medially, saccus rounded at apex (Fig. 37)................................... M. microdonta sp. nov.
9 Transtilla produced to a thumb-shaped process distally...................................................... 10
- Transtilla not produced to such a process distally........................................................... 11
10 Dorsal process of sacculus reaching before middle of ventral margin of valva (Fig. 28)............. M. bidigitata sp. nov.
- Dorsal process of sacculus reaching before apex of ventral margin of valva (Fig. 35)............ M. longihamata sp. nov.
11 Aedeagus with one or two cornuti....................................................................... 12
- Aedeagus without cornuti............................................................................. 16
12 Aedeagus with two cornuti, saccus shorter than uncus (Fig. 38)............................. M. papillisetosa sp. nov.
- Aedeagus with one cornutus, saccus longer than uncus or as long as uncus...................................... 13
13 Saccus longer than uncus.............................................................................. 14
- Saccus as long as uncus............................................................................... 15
14 Ventral margin of valva with two cornuted apical processes, aedeagus with two spine-shaped processes (Fig. 27)............................................................................................. M. bicornea sp. nov.
- Ventral margin of valva without an apical process, aedeagus without a process (Wang 2006a: Fig. 14)....... M. trimaculata
15 Ventral margin of valva serrate, sacculus without a process apically (Fig. 34)................... M. ledongensis sp. nov.
- Ventral margin of valva not serrate, sacculus with two processes apically (Wang 2006a: Fig. 6)........... M. rostriformis
16 Ventral margin of valva with a denticle or a spine at apex.................................................... 17
- Ventral margin of valva with neither a denticle nor a spine at apex............................................. 19
17 Ventral margin of valva with a denticle at apex, sacculus with two processes apically (Fig. 33)........ M. forcipata sp. nov.
- Ventral margin of valva with a spine at apex, sacculus with a spine and a process or with a process apically............. 18
18 Ventral margin of valva dentate in distal 2/3, sacculus with a short spine and a large digitate process at apex (Fig. 40)....................................................................................... M. recticostata sp. nov.
- Ventral margin of valva not dentate in distal 2/3, sacculus with a process at apex (Wang 2006a: Fig. 12)... M. infundibularis
19 Ventral margin of valva with a process or tooth............................................................ 20
- Ventral margin of valva with neither process nor tooth....................................................... 21
20 Ventral margin of valva with a large triangular process at base (Fig. 26)....................... M. basiprocessa sp. nov.
- Ventral margin of valva with a large tooth at middle (Fig. 36)............................. M. mecobursoides sp. nov.
21 Sacculus with several short spines apically (Yin &Wang 2016: Fig. 5)................................ M. apicispinata
- Sacculus with one or two processes apically............................................................... 22
22 Sacculus with one process apically, saccus nearly same length as uncus (Fig. 31)................... M. cuneata sp. nov.
- Sacculus with two processes apically, saccus distinctly longer than uncus (Wang 2006b: Fig. 218)................ M. liui