Isoperla sandbergi Szczytko and Kondratieff, 2015

Grubbs, Scott A., 2016, Taxonomic Notes On The Eggs Of Eastern Nearctic Isoperla (Plecoptera: Perlodidae: Isoperlinae), Illiesia 12 (8), pp. 35-41 : 39

Isoperla sandbergi Szczytko and Kondratieff, 2015

Cheaha Stripetail

( Figs. 7‒12 )

http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org: TaxonName:468960

Isoperla sandbergi Szczytko & Kondratieff, 2015:229 .

Holotype ♂ ( USNM), Dry Creek, above Cheaha Lake , Cheaha State Park , Cleburne Co., Alabama

Egg. General shape oblong, cross-section concave ( Figs. 7‒8 ); anterior and posterior poles broadly-rounded ( Figs. 9‒10 ). Color pale yellow. Collar absent ( Fig. 9 ). Hexagonal follicle cell impressions not visible; chorionic surface covered with small pits; eclosion line absent; micropyles with thickened openings, arranged in a row of 3 near anterior 1/3 of egg ( Figs. 11‒12 ).

Material examined. Alabama, Calhoun Co., spring into Cottaquilla Creek , 33.7656, -85.7166, 9 April 2010, S.A. Grubbs, 10♂, 8♀ ( WKUC) ; same but 7 March 2012, S.A. Grubbs, 1♂ ( WKUC) ; Jones Branch , 33.8570, -85.6187, 13 April 2012, A.L. Sheldon, 2♂, 1♀ ( WKUC) ; Jones Branch , 33.8454, -85.6273, 13 April 2012, A.L. Sheldon, 1♂, 2♀ ( WKUC) ; tributary to Jones Branch , 33.8457, -85.6280, 13 April 2012, A.L. Sheldon, 1♀ ( WKUC) ; tributary to Jones Branch , 33.8572, -85.6184, 13 April 2012, A.L. Sheldon, 1♀ ( WKUC) ; Clay Co., tributary to West Fork Hatchett Creek , 33.2945, -86.0615, 8 May 2005, A.L. Sheldon, 2♂, 1♀ ( WKUC) ; tributary to Talladega Creek , 33.3971, -85.8653, 9 May 2005, A.L. Sheldon, 1♂ ( WKUC) ; Talladega Creek , 33.4023, -85.8572; 9 May 2005, A.L. Sheldon, 3♂, 1♀ ( WKUC) ; same but 8 April 2008, A.L. Sheldon, 5♂, 10♀ ( WKUC) ; Talladega Creek , 33.4061, -85.8502; 9 May 2005, A.L. Sheldon, 1♂, 1♀ ( WKUC) ; same but 8 April 2008, A.L. Sheldon, 3♂ ( WKUC) ; tributary to Talladega Creek , 33.4009, -85.8559, 9 May 2005, A.L. Sheldon, 1♂ ( WKUC) ; tributary to Cheaha Creek , 33.4065, -85.8496, 8 April 2008, A.L. Sheldon, 1♂, 1♀ ( WKUC) ; tributary to Cheaha Creek , 33.4401, -85.8382, 8 April 2008, A.L. Sheldon, 4♂, 6♀ ( WKUC) ; tributary to Cheaha Creek , 33.4402, -85.8328, 12 April 2012, A.L. Sheldon, 1♂ ( WKUC) ; tributary to Cheaha Creek , 33.4398, -85.8376, 12 April 2012, A.L. Sheldon, 1♂, 1♀ ( WKUC) ; tributary to Cheaha Creek , 33.4398, -85.8389, 12 April 2012, A.L. Sheldon, 1♂ ( WKUC) ; Cleburne Co., tributary to Terrapin Creek , 33.8775, -85.5658, 22 May 2006, A.L. Sheldon, 1♂ ( WKUC) ; tributary to Terrapin Creek , 33.8777, -85.5700, 22 May 2006, A.L. Sheldon, 1♀ ( WKUC) ; tributary to Terrapin Creek , 33.8784, -85.5510, 9 April 2008, A.L. Sheldon, 1♂, ( WKUC) .

Distribution. USA: AL ( DeWalt et al. 2016).

Diagnosis. Szczytko & Kondratieff (2015) placed I. sandbergi in the I. similis ( Hagen, 1861) Group with I. bellona Banks, 1911 , I. cherokee Szczytko and Kondratieff, 2015 , I. distincta Nelson, 1976 , I. major Nelson and Kondratieff, 1983 , I. similis , and I. starki Szczytko and Kondratieff, 2015 . The eggs of I. bellona and I. distincta remain undescribed. The combination of a concave profile and lack of a collar easily distinguishes the eggs of I. sandbergi from I. cherokee , I. major , I. similis , and I. starki . The eggs of I. major and I. similis are round in crosssection, possess a low raised collar, and lack a concavity ( Szczytko & Kondratieff 2015, figs. 29.7, 51.15). The eggs of I. cherokee and I. starki have a concave profile but possess either a low, buttonlike collar ( I. cherokee ; Szczytko & Kondratieff 2015, Figs. 7.24‒7.25 ) or a distinct, elevated collar ( I. starki ; Szczytko & Kondratieff 2015, Fig. 55.21).

Comments. This species appears to be the most common headwater Isoperla in the Talladega Mountain region (Sheldon & Grubbs unpublished data).

Figures

Figs. 7–12. Isoperla sandbergi. Alabama, spring into Cottaquilla Creek. 7, egg, convex profile, 370X; 8, egg, concave profile, 330X; 9, egg, posterior pole, concave profile, 700X; 10, egg, anterior pole, concave profile, 1000X; 11, egg, anterior pole, concave profile, details of micropyles, 900X; 12, egg, anterior pole, convex profile, details of micropyles, 1400X. mp = micropyles.