Soyedina merritti Baumann & Grubbs, 1996

Grubbs, Scott A. & Baumann, Richard W., 2023, The Nemourinae (Insecta, Nemouridae) of the eastern Nearctic, Zootaxa 5306 (1), pp. 1-53 : 38-40

19. Soyedina merritti Baumann & Grubbs, 1996

Powdermill Forestfly

http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org:TaxonName:6060

( Figs. 129–134 )

Soyedina merritti Baumann & Grubbs 1996:221 . Holotype male (United States National Museum), Maul Spring , Powdermill Nature Reserve, Westmoreland Co., Pennsylvania, USA

Soyedina merritti Grubbs & Baumann, 2019:234

Distribution. USA: PA ( DeWalt et al. 2022)

Male. Macropterous. Body length 5.0–7.0 mm, forewing length 6.7–7.4 mm (n = 5). Gills absent. Cerci simple and unmodified. Paraprocts with two lobes, inner lobes lightly sclerotized and inconspicuous, outer lobes sclerotized, subtriangular in shape, slightly tapered apically to an anteriorly-directed spur ( Fig. 133 ). Epiproct asymmetric, typical for genus ( Fig. 129 ); ventral sclerites partially recurved over abdomen, distinctly asymmetric, apically narrowly triangular ( Fig. 129 ); dorsal sclerites distinctly asymmetric, appearing scaly at higher magnifications ( Figs. 130‒ 132 ); open apically, inner member heavily sclerotized, flanged apically, lip symmetric apically ( Figs. 130‒131 ).

Female. Macropterous. Body length 5.7–7.8 mm, forewing length 7.9–9.3 mm (n = 8). Gills absent. Cerci simple and unmodified. Subgenital plate well-developed, subtriangular in shape; base broad, extending from posterior of seventh sternum entirely over eighth sternum and approximately ¼ over ninth sternum; terminating in broadly-rounded apex ( Fig. 134 ).

Larva. Undescribed.

Comments. Soyedina merritti is known only from a small geographic area along the Appalachian Plateau Province in southwestern Pennsylvania (Baumann & Grubbs 2006, Grubbs & Baumann 2019).

Figures

FIGURES 129‒134. Soyedina merritti. 129, USA, Pennsylvania, seep into Powdermill Run, epiproct, ventral view; 130, USA, Pennsylvania, seep into Powdermill Run, epiproct apex, ventral view; 131, USA, Pennsylvania, seep into Indian Creek, epiproct, lateral view; 132, USA, Pennsylvania, seep into Powdermill Run epiproct, caudal view; 133, USA, Pennsylvania, seep into Powdermill Run, outer paraproct lobe, lateral view. 134, USA, Pennsylvania, seep into Powdermill Run, female, abdominal terminalia, ventral view. ds = dorsal sclerite, im = inner member, vs = ventral sclerite.