Zwicknia, Muranyi, 2014

Reding, Jean-Paul G., 2018, Stoneflies of the genus Zwicknia Murányi, 2014 (Plecoptera: Capniidae) from western Switzerland, Zootaxa 4382 (2), pp. 201-241 : 205

Key to adults of Zwicknia from western Switzerland

1 Macropterous ( Figs. 4 , 9 and 14). Cubital cell of forewing delimitated by the two cross-veins between veins Cu1 and Cu2 quadrangular in shape ( Figs. 4 , 9 and 14; Aubert 1959: 26, Fig. 22; Murányi et al. 2014: 31, Fig. 56 ). Posterior margin of subgenital plate (sternite 8) rectilinear or slightly rounded ( Fig. 5)........... adult females of Zwicknia (not keyed out further)

- Micropterous ( Figs. 1 and 6) or brachypterous ( Figs. 10 and 13). Presence of an epiproct sclerite bent over the last tergites; tergite 9 with a characteristic process ( Figs. 3 , 8 and 12 ). Presence of a ventral vesicle at the center of the posterior margin of sternite 9 ( Figs. 2 , 7 and 11 )......................................................... 2 (adult males of Zwicknia )

2 Brachypterous ( Figs. 10 and 13). Tip of main epiproct sclerite long, slender, regularly bent and pointed at apex, in lateral view ( Fig. 12 ). Process on tergite 9 high, perpendicularly raised and less than twice as wide as the main epiproct sclerite ( Fig. 12 ; Boumans & Murányi 2014: 8, Fig. 2 ). Ventral vesicle half as wide as the subgenital plate ( Fig. 11 )..... Zwicknia westermanni

- Micropterous ( Figs. 1 and 6)............................................................................. 3

3 In lateral view, the tip of the main epiproct sclerite is ogive, neither up-curved nor down-curved ( Fig. 3 ). In dorsal view, the main epiproct sclerite is long and slender, with nearly parallel edges and without bulges ( Reding et al. 2016: 140, Fig. 4 ). Process of tergite 9 low, rising sharply near the distal region of the corresponding tergite, not projecting caudally ( Fig. 3 ). Ventral vesicle small, rounded at apex; width about ¼ to 1/5 of the subgenital plate ( Fig. 2 ; Reding et al. 2016: 141, Fig. 5)............................................................................................... Zwicknia ledoarei

- In lateral view, the tip of the main epiproct sclerite is pointed, slightly up-curved ( Fig. 8 ). Process of tergite 9 high and perpendicularly elevated, in lateral view ( Fig. 8 ), arch-shaped in dorso-caudal view (Murányi et al. 2014: 58, Fig. 120). Ventral vesicle covering slightly less than half the width of the subgenital plate ( Fig. 7 )........................... Zwicknia bifrons

Figures

FIGURE 1. Zwicknia ledoarei, micropterous adult male, lateral view.

FIGURE 2. Zwicknia ledoarei, adult male, subgenital plate andvesicle, ventral view.

FIGURE 3. Zwicknia ledoarei, adult male, main epiproct sclerite and process of tergite 9, lateral view.

FIGURE 4. Zwicknia ledoarei, adult female,forewing. Arrow pointing at quadrangular cubital cell.

FIGURE 7. Zwicknia bifrons, adult male, subgenital plate and vesicle, ventral view.

FIGURE 8. Zwicknia bifrons, adult male, main epiproct sclerite and process of tergite 9, lateral view.

FIGURE 11. Zwicknia westermanni, adult male, subgenital plate and vesicle, ventral view.

FIGURE 12. Zwicknia westermanni, adult male, main epiproct sclerite and process of tergite 9, lateral view.

FIGURE 56. Distribution of Zwicknia westermanni in Switzerland (Source of basemap: Federal Office of Topography swisstopo)