Paranemoura perfecta ( Walker, 1852 )

Grubbs, Scott A. & Baumann, Richard W., 2023, The Nemourinae (Insecta, Nemouridae) of the eastern Nearctic, Zootaxa 5306 (1), pp. 1-53 : 17-18

7. Paranemoura perfecta ( Walker, 1852)

Spotted Forestfly

http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org:TaxonName:6128

( Figs. 3 , 49‒54 )

Nemoura perfecta Walker 1852:191 . Holotype male (British Museum of Natural History), Redman, Nova Scotia, Canada Nemoura punctipennis: Claassen, 1923:291 . Syn. Illies, 1966:218

Nemoura punctipennis: Needham & Claassen, 1925:221

Nemoura perfecta: Claassen, 1940:61

Nemoura (Paranemoura) perfecta: Ricker, 1952:41

Paranemoura perfecta: Illies, 1966:218

Nemoura (Paranemoura) perfecta: Harper & Hynes, 1971:1137

Paranemoura perfecta: Zwick, 1973:345

Nemoura (Paranemoura) perfecta: Hitchcock, 1974:103

Paranemoura perfecta: Baumann, 1975:54 , 64 (in part), 66 (in part)

Paranemoura perfecta: Stewart & Stark, 1988:176

Paranemoura perfecta: Baumann, 1996:818

Paranemoura perfecta: Stark et al., 1998:119

Paranemoura perfecta: Stewart & Stark, 2002:203

Distribution. Canada: NB, NS, ON, PE, PQ. USA: CT, MA, MD, ME, MI, NC, NH, NY, PA, TN, VA, VT, WV ( DeWalt et al. 2022)

Male. Macropterous. Body length 4.8–5.7 mm, forewing length 5.0– 5.5 mm (n = 11) Gills absent. Cerci simple and unmodified ( Figs. 49‒51 ). Paraprocts undivided and broad, roughly triangular in shape. Epiproct ventral sclerite fully recurved over abdomen ( Figs. 49‒50 ), ca. parallel-sided and longitudinally split into halves for ca. ⅔ length by the dorsal sclerite ( Figs. 50‒52 ), basolateral margins gently rounded and sparsely covered by small spinules, notch lacking ( Figs. 49‒50 ), anteriorly tapered to a narrow, parallel-sided rounded apex ( Fig. 52 ); posteriorly-directed epihooks of dorsal sclerite smooth and acute ( Figs. 49‒50 ).

Female. Macropterous. Body length 5.1–6.1 mm, forewing length 5.0– 6.4 mm (n = 8). Gills absent. Cerci simple and unmodified ( Figs. 53‒54 ). The 8 th sternum is medially concave and not produced distally, Y-sclerite open along posterior margin ( Figs. 53‒54 ); 7 th sternum is unsclerotized, with a short rounded medial projection extending ¼‒½ over the 8 th sternum ( Figs. 53‒54 ).

Larva. The description by Harper & Hynes (1971) from southern Quebec and partial illustration in Baumann (1975) may refer to P. claasseni .

Comments. Paranemoura perfecta overlaps with P. claasseni in the northeastern Nearctic but has a much broader distribution, extending westward across southern Ontario to Michigan’s Upper Peninsula ( Grubbs et al. 2012) and southward through the Appalachian Mountains to Tennessee and North Carolina ( DeWalt et al. 2022).

Figures

FIGURES 1‒8. Forewing images. 1, Nemoura arctica, USA, Michigan, Silver Creek; 2, Ostrocerca albidipennis, USA, West Virginia, Middle Fork Indian Run; 3, Paranemoura perfecta, USA, West Virginia, headwaters Sugar Creek; 4, Podmosta macdunnoughi, USA, New York, Grampus Brook, dark line at tips of arrows represent the termini of veins A1 and A2; 5, Prostoia completa, USA, Kentucky, Middle Fork Drakes Creek; 6, Shipsa rotunda, USA, Michigan, Montreal River; 7, Soyedina calcarea, USA, Kentucky, tributary Green River; 8, Zapada katahdin, Canada, Labrador, tributary Leg Lake.

FIGURES 49‒54. Paranemoura perfecta. 49, male abdominal terminalia, lateral view; 50, Canada, Nova Scotia, Silvey Brook, epiproct, dorsolateral view; 51, male abdominal terminalia, lateral view; 52, Canada, Nova Scotia, Silvey Brook, epiproct, dorsal view; 53, female abdominal terminalia, ventral view; 54, USA, West Virginia, Glady Fork, female abdominal terminalia, ventral view. c = cercus, ds = dorsal sclerite, ep = epihook, vs = ventral sclerite.