4. Ostrocerca prolongata (Claassen, 1923)

Bent Forestfly

http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org:TaxonName:6138

(Figs. 31–36)

Nemoura prolongata Claassen 1923:289 . Holotype male ( Cornell University Insect Collection), Bretton Woods, (Coös Co.), New Hampshire, USA

Nemoura prolongata: Needham & Claassen, 1925:219

Nemoura prolongata: Claassen, 1940:62

Nemoura (Ostrocerca) prolongata: Ricker, 1952:40

Ostrocerca prolongata: Illies, 1966:218

Ostrocerca prolongata: Zwick, 1973:344

Nemoura (Ostrocerca) prolongata: Hitchcock, 1974:104

Ostrocerca prolongata: Young et al., 1989:261

Distribution. Canada: NB, PQ. USA: DE, ME, NH, NY, PA, VA, WV (DeWalt et al. 2022)

Male. Macropterous. Body length 3.8–5.7 mm, forewing length 5.5–6.3 mm (n = 7). Gills absent. Cerci enlarged and elongated, sclerotized, medially arcuate, and terminating to an apical point (Figs. 31–32, 34). Paraprocts divided into a membranous outer lobe and a sclerotized inner lobe; inner lobe is long, basally broader and tapering apically (Fig. 34; Young et al. 1989, their fig. 12). Epiproct elongate and complex; dorsal sclerite smooth basally and dorsally, bifurcated in apical half, terminating in tapered, sclerotized processes (Figs. 32–33); ventral sclerite have paired, dorsally recurved hooked-like process and a single, narrowed elongated process (Figs. 32–33).

Female. Macropterous. Body length 5.0– 6.8 mm, forewing length 6.0– 7.2 mm (n = 4). Gills absent. Cerci enlarged but unmodified (Fig. 35). The 8 th sternum is moderately enlarged as a subgenital plate, extending only partially over the 9 th sternum and distally concave; medial region is markedly sclerotized (Figs. 35–36). The 7 th sternum is modified distally as a large nipple-shaped process that extends at least over ¼ of the 8 th sternum (Figs. 35–36).

Larva. Undescribed.

Comments. Ostrocerca prolongata exhibits a similar distribution to O. complexa, known from New Brunswick and Quebec south to Virginia and West Virginia (DeWalt et al. 2022).