Prostoia hallasi Kondratieff & Kirchner, 1984

Grubbs, Scott A. & Baumann, Richard W., 2023, The Nemourinae (Insecta, Nemouridae) of the eastern Nearctic, Zootaxa 5306 (1), pp. 1-53 : 24

10. Prostoia hallasi Kondratieff & Kirchner, 1984

Swamp Forestfly

http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org:TaxonName:6098

( Figs. 69‒76 )

Prostoia hallasi Kondratieff & Kirchner 1984:579 . Holotype male (United States National Museum), Washington Ditch , City of Suffolk, Virginia, USA

Prostoia hallasi: Kondratieff & Kirchner, 1991:215

Prostoia hallasi: Grubbs et al., 2014:18

Prostoia hallasi: Stark, 2017:214

Distribution. USA: CT, GA, IL, MA, NC, VA ( DeWalt et al. 2022)

Male. Macropterous. Body length 4.8–5.2 mm, forewing length 4.9–5.5 mm (n = 2). Gills absent. Cerci simple and unsclerotized ( Figs. 69‒70 ). Paraprocts with lightly sclerotized, undivided lobes. Epiproct ventral sclerite sclerotized throughout length, narrow in both dorsal and lateral profiles, and fully recurved over abdomen ( Figs. 69‒71 ); base parallel-sided for ca. ½ of length ( Figs. 69, 74 ); tip with subterminal excavation anterior to complex, paired ventrallydirected processes ( Figs. 70, 72‒73 ); dorsal sclerite reduced to basal area, lacking lateral arms ( Fig. 70 ).

Female. Macropterous. Body length 4.8–6.1 mm, forewing length 6.2–6.9 mm (n = 6). Gills absent. Cerci simple and unsclerotized. The 7 th and 8 th sterna separate medially ( Fig. 75‒76 ); the 8 th sternum is modified slightly as a subgenital plate, with small notch and lightly-sclerotized area medially ( Figs. 75‒76 ).

Larva. Briefly characterized by Kondratieff & Kirchner (1984) as morphologically indistinguishable from P. completa and P. similis . Stark (2017) provided a partial illustration of the tibia.

Comments. Prostoia hallasi has a unique distribution compared to the other eastern Nearctic Nemourinae . To date, most records are from Atlantic Coastal Plain regions of five eastern US states but nothing yet from coastal areas of Florida west to Texas ( DeWalt et al. 2022). What makes the distribution especially unusual was the recent and unexpected discovery of two populations from southern Illinois ( Grubbs et al. 2014).

Figures

FIGURES 69‒76. Prostoia hallasi. 69, USA, Virginia, Washington Ditch, epiproct, dorsal view; 70, male abdominal terminalia, lateral view; 71, USA, Virginia, Washington Ditch, epiproct, lateral view; 72, USA, Illinois, tributary to Alcorn Creek, epiproct apex, lateral view; 73, USA, Virginia, Washington Ditch, epiproct apex, lateral view; 74, USA, Virginia, Washington Ditch, male abdominal terminalia, caudal view; 75, female abdominal terminalia, ventral view; 76, USA, Virginia, 1 mi SE Dunnsville, female abdominal terminalia, ventral view. c = cercus, la = lateral arm, sgp = subgenital plate, vs = ventral sclerite.