Shipsa rotunda ( Claassen, 1923 )

Grubbs, Scott A. & Baumann, Richard W., 2023, The Nemourinae (Insecta, Nemouridae) of the eastern Nearctic, Zootaxa 5306 (1), pp. 1-53 : 29-30

13. Shipsa rotunda ( Claassen, 1923)

Intrepid Forestfly

http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org:TaxonName:6089

( Figs. 6 , 95–98 )

Nemoura rotunda Claassen 1923 . Holotype male ( Cornell University Insect Collection ), Waldoboro, (Lincoln Co.), Maine, USA

Nemoura rotunda: Needham & Claassen, 1925:219

Nemoura rotunda: Claassen, 1940:62

Nemoura rotunda: Ricker, 1944:177

Nemoura rotunda: Harden & Mickel, 1952:17

Nemoura (Shipsa) rotunda: Ricker, 1952

Shipsa rotunda: Illies, 1966

Nemoura (Shipsa) rotunda: Harper & Hynes, 1971:1139

Shipsa rotunda: Zwick, 1973

Nemoura (Shipsa) rotunda: Hitchcock, 1974:104

Shipsa rotunda: Baumann, 1975:54 , 63 (in part), 66 (in part)

Shipsa rotunda: Dosdall & Lehmkuhl, 1979:38

Shipsa rotunda: Stewart & Stark, 1988:185

Shipsa rotunda: Poulton & Stewart, 1991:30

Shipsa rotunda: Stewart & Stark, 2002:211

Shipsa rotunda: Stewart & Oswood, 2006:81

Shipsa rotunda: Grubbs & Baumann, 2021:51

Distribution. AB, LB, MB, NB, NS, NT, NU, ON, PQ, SK. USA: AK, AL, AR, GA, IA, IL, MA, MD, ME, MI, MN, MS, NC, NE, NH, NY, SC, VA, VT, WI ( DeWalt et al. 2022)

Male. Macropterous. Body length 4.9–5.9 mm, forewing length 5.7–6.6 mm (n = 10). Gills absent. Cerci simple and unmodified ( Figs. 95‒96 ). Tenth tergum produced distally as a pair of elongated spiny lobes ( Figs. 95‒96 ). Paraprocts undivided as a sclerotized, triangular lobe. Epiproct compact and complex; dorsal sclerite with three units, basally with paired ca. parallel, elongated lobes ( Fig. 95 ), extending slightly anteriorly as medially-concave narrow ridges ( Fig. 95 ), and somewhat laterally as tapered, lateral arms curving dorsally ( Fig. 95 ); ventral sclerite broadest basally, nearly devoid of hairs or spines, extending dorsally and slightly recurved anteriorly as paired lobes ( Fig. 96 ).

Female. Macropterous. Body length 5.7–7.3 mm, forewing length 6.8–8.4 mm (n = 12). Gills absent. Cerci simple and unmodified. Subgenital plate sclerotized, not produced, and concave medially where the 7 th sternum extends to anterior margin of 8 th sternum ( Figs. 97‒98 ). In relaxed females, a t-shaped sclerotized band is present at the terminus of the 8 th sternum ( Fig. 97 ) but obscured and not seen in most preserved specimens ( Fig. 98 ).

Larva. Described by Harden & Mickel (1952) and Harper & Hynes (1971). Stewart & Stark (2002) provided a full habitus illustration. Additional illustrations were also given by Baumann (1975), Poulton & Stewart (1991) and Harper & Stewart (1996).

Comments. Shipsa rotunda is a monotypic species with a very broad longitudinal distribution across North America, from western Alaska east across Canada to Labrador, New Brunswick, and Nova Scotia, distributed extensively in the USA from the Laurentian Great Lakes region east to New England, but also from Arkansas east to Georgia and north to Maryland ( Grubbs & Baumann 2021; DeWalt et al. 2022). The type locality as listed in Claassen (1923, pg. 290) was spelled incorrectly as Waldeboro (sic).

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 95‒98. Shipsa rotunda. 95, USA, Virginia, Meherrin River, male abdominal terminalia, dorsal view; 96, USA, Virginia, Meherrin River, male abdominal terminalia, ventral view; 97, Canada, Ontario, Skootamatta River, female abdominal terminalia, ventral view; 98, Canada, Quebec, Riviere du Diable, female abdominal terminalia, ventral view. c = cercus, ds = dorsal sclerite, la = lateral arm, sgp = subgenital plate, sl 10 = spiny lobes of 10th tergum.