IX. Genus Zapada Ricker, 1952

http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org:TaxonName:5989

Type species. Nemoura haysi Ricker, 1952

Range. Eastern Palearctic and Nearctic (DeWalt et al. 2022).

Diagnosis. See Baumann (1975) for a comprehensive description of the genus and Grubbs et al. (2015) for a morphological- and SEM-based treatment for all three eastern Nearctic species.

Species key to eastern Nearctic Zapada adult males and females

(modified from Grubbs et al. 2015)

1 Cervical gills bearing four branches (Fig. 163); southern Appalachian Highlands species...................... Z. fumosa

- Cervical gills unbranched (Figs. 159, 167); southern Appalachian Highlands or northeastern Nearctic species............ 2

2 Cervical gills 9–10X greatest width (Fig. 159); southern Appalachian Highlands species known only from the eastern Tennessee portion of Great Smoky Mountains National Park....................................................... Z. chila

- Cervical gills 4–5X greatest width (Fig. 167); northeastern Nearctic species............................... Z. katahdin