Ostrocerca prolongata ( Claassen, 1923 )

Grubbs, Scott A. & Baumann, Richard W., 2023, The Nemourinae (Insecta, Nemouridae) of the eastern Nearctic, Zootaxa 5306 (1), pp. 1-53 : 11-12

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).

Figures

FIGURES 31‒36. Ostrocerca prolongata. 31, male abdominal terminalia, dorsal view; 32, Canada, Quebec, tributary to Lac Croche, epiproct, dorsal view; 33, Canada, Quebec, tributary to Lac Croche, epiproct, lateral view; 34, Canada, Quebec, tributary to Lac Croche, epiproct, ventral view; 35, USA, West Virginia, Seneca Creek, female abdominal terminalia, ventral view; 36, USA, West Virginia, Gandy Creek, female abdominal terminalia, ventral view. bc = basal cushion, c = cercus, ds = dorsal sclerite, hy = hypoproct, ipl = inner paraproct lobe, sgp = subgenital plate, vs = ventral sclerite.