1. Dorsal process of male pygofer with several spines........................................................... 2
- Dorsal process of male pygofer without spines, smooth........................................................ 3
2. Dorsal process of male pygofer extended only along inner surface of pygofer lobe, with 5 stout spines; apex of aedeagus evenly tapered in lateral view.............................................................. Z. spinosa sp. nov.
- Dorsal process of male pygofer extended beyond pygofer lobe, with several short spines or serrations; apex of aedeagus obliquely truncate at level of gonopore in lateral view.................................................... Z. katoi
3. Aedeagus with pair of basal forked processes, and pair of apical processes.............................. Z. steggerdai
- Aedeagus without basal processes, with or without subapical and apical processes.................................. 4
4. Dorsal process of male pygofer bifurcate, with two apices........................................ Z. dworakowskae
- Dorsal process of male pygofer with single apex............................................................ 5
5. Aedeagal shaft without subapical and apical processes................................................. Z. lyrifora
- Aedeagal shaft with pair of subapical and apical processes..................................................... 6
6. Aedeagal shaft with pair of long subapical and apical processes.................................... Z. heptapotamica
- Aedeagal shaft with pair of short subapical and long apical processes................................. Z. hirayamella