Isoperla burksi Frison, 1942

Banded Stripetail

(Figs. 1‒6)

http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org: TaxonName:468714

Isoperla burksi Frison, 1942:332 .

Holotype ♂ (INHS), Lusk Creek, Eddyville, Pope Co., Illinois

Isoperla burksi: Illies 1966:392, 397.

Isoperla burksi: Poulton & Stewart 1991:47 .

Isoperla burksi: Szczytko & Kondratieff 2015:52 .

Egg. General shape oblong, cross-section concave (Figs. 1‒2), anterior and posterior poles broadly-rounded (Figs. 2‒4). Color pale brown. Collar well-developed, with irregular longitudinal ridges, slightly flared apically (Fig. 3). Follicle cell impressions near collar ranging from elongate to hexagonal (Figs. 1, 3). Chorion covered mostly with irregular-shaped pentagonal or hexagonal follicle cell impressions with thickened elevated ridges (Figs. 4‒6); floors with numerous shallow pits (Fig. 5‒6). Eclosion line present (Figs. 4‒6). Micropyles located along ridges near eclosion line in anterior ¼ (Figs. 5‒6).

Material examined. Alabama, DeKalb Co., South Sauty Creek, 6 km N Rainsville, 34.5484, -85.8543, 7 May 2008, S.A. Grubbs, ♂, ♀ (WKUC) . Indiana, Jackson Co., Little Salt Creek, 7 km NNW Freetown, 39.0375, -86.1494, 25 May 2002, S.A. Grubbs, 2♀ (WKUC) . Kentucky, Edmonson Co., Bear Creek, 3 km NW Bee Spring, 37.3029, -86.3204, 6 May 2013, S.A. Grubbs, ♀ (WKUC) ; Green Co., Big Brush Creek, Bloyd, 37.4049, -85.5758, 27 April 2002, S.A. Grubbs, ♀ (WKUC) .

Distribution. USA: AL, AR, IL, IN, KY, MD, MO, NC, SC, NJ, OH, OK, SC, VA, WV (DeWalt et al.

2016).

Diagnosis. Szczytko & Kondratieff (2015) placed this species in the I. burksi group with I. cotta Ricker, 1952 and I. orata Frison, 1942 . Egg characteristics uniting these species include a concave crosssection, well-developed collar, distinct ridges offsetting the cell impressions, and lack of an eclosion line (Szczytko & Kondratieff 2015). Eggs of I. burksi from Indiana and Kentucky, however, possess a distinct eclosion line (Figs. 4‒6) that easily distinguishes this species from I. cotta (Szczytko & Kondratieff 2015, figs. 10.14, 10.18) and I. orata (Szczytko & Kondratieff 2015, figs. 37.9, 37.12). Each of the other three characteristics listed above are exhibited by I. burksi .