Zapada Ricker, 1952

Grubbs, Scott A. & Baumann, Richard W., 2023, The Nemourinae (Insecta, Nemouridae) of the eastern Nearctic, Zootaxa 5306 (1), pp. 1-53 : 45

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

Figures

FIGURES 161‒164. Zapada fumosa. 161, USA, Virginia, Lewis Fork, male terminalia, dorsal view; 162, USA, Virginia, Lewis Fork, epiproct, lateral view; 163, USA, Virginia, Lewis Fork, cervical gills, ventral view; 164, USA, Virginia, Lewis Fork, subgenital plate, ventral view. c = cercus, ds = dorsal sclerite, imb = inner medial branch, lb = lateral branch, ma = membranous area, mmb = medial medial branch, omb = outer medial branch, sgp = subgenital plate, vs = ventral sclerite.

FIGURES 157‒160. Zapada chila. 157, USA, Tennessee, Little Pigeon River, male terminalia, dorsal view; 158, USA, Tennessee, Little Pigeon River, epiproct, lateral view; 159, USA, Tennessee, Little Pigeon River, cervical gills, ventral view; 160, USA, Tennessee, Little Pigeon River, subgenital plate, ventral view. c = cercus, ds = dorsal sclerite, lg = lateral gill, ma = membranous area, mg = medial gill, sgp = subgenital plate, vs = ventral sclerite.

FIGURES 165‒168. Zapada katahdin. 165, Canada, Labrador, Leg Lake, male terminalia, dorsal view; 166, USA, Maine, Katahdin Stream, epiproct, lateral view; 167, USA, Maine, Abol Stream, cervical gills, ventral view; 168, Canada, Labrador, tributary Beverly Lake, subgenital plate, ventral view. c = cercus, dh = dorsal hump, ds = dorsal sclerite, lg = lateral gill, ma = membranous area, mg = medial gill, sgp = subgenital plate.