Neoperla, Needham, 1905

Stark, Bill P. & Sivec, Ignac, 2008, New Stoneflies (Plecoptera) From Asia, Illiesia 4 (1), pp. 1-10 : 3-5

Provisional Key for Males of the Borneensis Subgroup of Neoperla

1 Notch on process of tergum 7 wider than projecting lobes …………………………...……… 2

1’ Notch on process of tergum 7 narrow, bases of projecting lobes touch on inner margins ( Fig. 6 ).…………………………………………………….. 3

2 Posterolateral bases of hemiterga slightly widened, hemitergal finger lobes straight; everted aedeagal sac bearing a small ventrobasal conical process armed with small spines, and area between apical spine patch and dorsobasal lobes armed only with minute spinule ..……. borneensis

5

9 11

2’ Posterolateral bases of hemiterga very wide, hemitergal finger lobes curved slightly outward; everted aedeagal sac without ventrobasal conical process ..………………… naviculata (2 subspecies)

3 Everted aedeagal sac tubular, without spiny lobes …………………………………………..…. furcifera

3’ Everted aedeagal sac with one or more spiny lobes ……………………………………………….. 4

4 Largest spiny lobes of aedeagal sac project laterally ………………………………...…… furcata

4’ Largest spiny lobes of aedeagal sac project ventrally or dorsally ……………………………... 5

5 Ventrobasal sac lobe conical, narrower in lateral aspect than dorsobasal spiny cushion; apical sac lobe bearing a patch of enlarged spines along mid dorsolateral margin ………………………. bilobata

5’ Ventrobasal sac lobe broadly rounded, larger than dorsobasal spiny cusion in lateral aspect; apical sac lobe without patch of enlarged spines along mid dorsolateral margin …………………………. 6

6 Everted sac surface without minute spinules scattered over surface; dorsobasal spiny cushion scarcely projecting in lateral aspect ……... harina

6’ Everted sac surface covered with minute spines; dorsobasal spiny cushion prominent ( Fig. 8 ).……………………………………….… peterzwicki

Figures

Figs. 5-11. Neoperla peterzwicki. 5. Head and pronotum, 6. Male abdominal terga 7-9, 7. Aedeagus lateral, 8. Aedeagus dorsal, 9. Female abdominal sterna 8-9, 10. Vagina, 11. Egg.