Neoperla montivaga, P.Zwick, 1977

Mo, Raorao, Wang, Guoquan & Li, Weihai, 2021, One new species and one poorly known species of Neoperla in the montivaga group (Plecoptera: Perlidae) from Hainan Province, China, Zootaxa 5004 (2), pp. 385-394 : 393

Key to species of Neoperla montivaga group (males) known from Hainan

1. Hemitergal processes of tergum 10 long, nearly extending over tergum 9 (see figs. 1c, 2a–2b in Mo et al. 2020).................................................................................................... N. longispina

- Hemitergal processes of tergum 10 short, normal length....................................................... 2

2. Process of tergum 7 truncate, apex is not triangular or trapezoidal............................................... 3

- Process of tergum 7 is triangular or trapezoidal.............................................................. 4

3. Aedeagal sac ventrally has two basal spinulose patches and a mesal bare lobe (see figs.1b–1e, 2 in Kong et al. 2014)................................................................................................... N. baisha

- Aedeagal sac ventrally has a pair of small, lateral spinous lobes and two large, mesal, spherical lobes, one of them has spines and one is bare (see fig. 14–16 in Chen & Du 2016)................................................. N. sexlobata

4. Process of tergum 7 is trapezoidal........................................................................ 5

- Process of tergum 7 is triangular......................................................................... 6

5. Trapezoidal process of tergum 7 has a pair of lateroapical subuliform lobes (see fig. 3 in Yang & Yang 1995)....................................................................................................... N. bicornuta

- Trapezoidal process of tergum 7 has not lateroapical subuliform lobes ( Fig. 6b ; see fig. 4 in Yang & Yang 1995)................................................................................................... N. hainanensis

6. Aedeagus double curved, shows an S-shaped curve in lateral view (see figs. 3c in Kong et al. 2014)........... N. bicurvata

- Aedeagus relatively straight without double curve........................................................... 7

7. Aedeagus has an elongate ventral projection and a pair of dorsal spinose projections at middle (see figs. 5d, 6 in Kong et al. 2014).................................................................................. N. furcomaculata

- Aedeagus only has a low ventral spinose projection at middle or a pair of basal dorsolateral spinose projections.......... 8

8. Aedeagal tube bears a pair of basal dorsolateral lobes (see figs. 7, 8 in Chen & Du 2016).................. N. wuzhishana

- Aedeagal tube has a low ventroapical lobe ( Figs. 2c–2e , 3c–3e )................................ N. limushana sp. nov.

Figures

FIGURE 2. Neoperla limushana sp. nov. (male). a. Terminalia after being cleared, lateral view. b. Terminalia after being cleared, oblique lateral view. c. Aedeagus, lateral view. d. Aedeagus, ventral view. e. Aedeagus, dorsal view.

FIGURE 3. Neoperla limushana sp. nov. (male from Yinggeling). a. Head and pronotum, dorsal view. b. Terminalia, oblique dorsal view. c. Aedeagus, lateral view. d. Aedeagus, ventral view. e. Aedeagus, dorsal view.

FIGURE 6. Neoperla hainanensis Yang & Yang, 1995 (male). a. Head and pronotum, dorsal view. b. Terminalia, oblique dorsal view. c. Aedeagus, lateral view. d. Aedeagus, ventral view.