Leuctra tenuis ( Pictet 1841 )

Grubbs, Scott A., 2015, Leuctra Schusteri, A New Stonefly Species (Plecoptera: Leuctridae) Of The L. Tenuis (Pictet) Group From The Southeastern Usa, Illiesia 11 (12), pp. 147-166 : 156-159

Leuctra tenuis ( Pictet 1841)

Narrow-lobed Needlefly

http://lsid.speciesfile.org/urn:lsid: Plecoptera .specie sfile.org:TaxonName:460989

( Figs. 23‒33 )

Nemoura tenuis Pictet 1841:375 . Type ( ZMHB), Philadelphia, (Philadelphia Co.), Pennsylvania

Leuctra tenuis: Illies 1966:109

Leuctra tenuis: Zwick 1973:407

Male. The 7th abdominal dorsal process is narrowly-triangular in shape, tapering to a tip that is bulbous and rounded posteriorly ( Figs. 23‒25 ). The specilla are ca. parallel-sided throughout length, except at the tip; specilla gently recurved anteriorly and mostly smooth distally ( Figs. 28‒30, 32 ); lacking a terminal spur or raised tubercles; bearing few pits distally ( Figs. 31, 33 ). The subanal lobes are narrow basally, tapering and gently recurved distally, ca. ¾ the length of the specilla ( Figs. 28‒30, 32 ).

Material examined. USA, Alabama, Cleburne Co., Hillabee Creek , 33.4855, -85.7934, 16 October 2005, A.L. Sheldon, 3♂ ( WKUC) . Connecticut, Tolland Co., Roaring Brook, Rte. 32, 6 km S Stafford Springs , 41.9035, -72.2878, 29 June 2006, S.A. Grubbs, 1♂, 2♀ ( WKUC) ; Windham Co., Bungee Brook , 3.5 km S Eastford, 41.8713, -72.0878, 29 June 2006, S.A. Grubbs, 1♂, 1♀ ( WKUC) . Indiana, Harrison Co., tributary to West Fork Mosquito Creek , 4 km E Laconia, 38.0245, -86.0393, 20 October 2002, S.A. Grubbs, 3♂, 4♀ ( WKUC) . Kentucky, Harlan Co., Watts Creek, Blanton Forest State Nature Preserve, 36.8619, -83.3753, 11 July‒3 September 2009, M.A. Floyd, 6♂ ( DCTC) ; same locality but 9 September‒4 November 2009, M.A. Floyd, 6♂ ( DCTC) . Maryland, Allegany Co., Deep Run, Green Ridge State Forest , 39.6531, -78.4523, 4 July 1996, S.A. Grubbs, 2♂, 7♀ ( WKUC) ; same locality but 7 August 1998, S.A. Grubbs, 6♂, 2♀ ( WKUC) ; Garrett Co., Middle Fork, Savage River State Forest , 39.5130, -79.1548, 3 July 1996, S.A. Grubbs, 15♂, 7♀ ( WKUC) ; Youghioghenny River , 39.5659, -79.4293, 13 July 1996, S.A. Grubbs, 4♂, 1♀ ( WKUC) . Massachusetts, Worcester Co., Stillwater River, Rte. 140, 5 km E Princeton , 42.4463, -71.8168, 28 June 2006, S.A. Grubbs, 4♂, 4♀ ( WKUC) ; Burnshirt River, Rte. 62, 5 km ENE Barre , 42.4363, - 72.0528, 28 June 2006, S.A. Grubbs, 1♂ ( WKUC) . North Carolina, Haywood Co., tributary to Mount Sterling Creek, FR 289, Pisgah National Forest , 35.7452, -83.0700, 11 July 1997, S.A. Grubbs, 1♂, 4♀ ( WKUC) ; Right Hand Prong, FS 97, Pisgah National Forest , 35.3711, -82.9405, 22 July 2015, A.L. Sheldon, 1♂ ( WKUC) ; Yancey Co., South Toe River, Pisgah National Forest , 35.7517, -82.2205, 17 July 2015, A.L. Sheldon, 2♂ ( WKUC) . Ohio, Adams Co., Waggoner Run, Abner Hollow , 12 km SE West Union, 38.7179, -83.4343, 19 September 2015, S.A. Grubbs, 1♂, 11♀ ( WKUC) . Pennsylvania, Mercer Co., Little Shenango River , 10 km E Greenville, 41.4185, -80.2683, 23 June 1998, S.A. Grubbs, 1♂ ( WKUC) ; Westmoreland Co., Powdermill Run, Powdermill Nature Reserve , 40.1517, -79.2703, 18 August 1993, S.A. Grubbs, 1♂ ( WKUC) . Rhode Island, Kent Co., Bucks Horn Brook, 14 km NW Exeter, Nicholas Farm Wildlife Management Area , 41.6952, -71.7566, 18 June 2007, S.A. Grubbs, 3♂, 2♀ ( WKUC) . Tennessee, Cocke Co., Cosby Creek, Rte. 32, 35.7839, -83.2191, 11 July 1997, S.A. Grubbs, 5♂, 3♀ ( WKUC) . Virginia, Wythe Co., Reed Creek, FR 221/CR 625, 16 km NW Wytheville , Jefferson National Forest , 36.9809, -81.2801, 24 July 2008, S.A. Grubbs, 1♂, 4♀ ( WKUC) ; Stony Fork, Reed Creek , U.S. 52, 10 km NW Wytheville, Jefferson National Forest , 36.9774, -81.1864, 24 July 2008, S.A. Grubbs, 2♂, 1♀ ( WKUC) . West Virginia, Greenbrier Co., Rt. 14, 3 mi E Neola, 6 September 2008, L. T. Miller, 1♂, 1♀ ( DCTC) ; Mercer Co., Camp Creek State Forest , 18 September 2008, L. T. Miller, 1♂ ( DCTC) ; Randolph Co., nr. Laneville, Dolly Sods , 25 September 2008, L. T. Miller, 1♂ ( DCTC) ; Tucker Co., Red Creek, Laneville , 20 August 2011, no collector information, 2♂, 3♀ ( DCTC) .

Distribution. Canada: NB, NS, ON, PQ. USA: AL, AR, CT, DE, IA, IL, IN, KY, MA, MD, ME, MI, MN, MO, NJ, NY, OH, OK, PA, VA, WI, WV ( DeWalt et al. 2015), NC, RI (new state records).

Remarks. Examination of material from throughout the eastern Nearctic region revealed consistency with the shapes of the paraprocts and the dorsal process on the 7 th abdominal tergum. Leuctra tenuis is a broadly-distributed species known from Quebec and the Canadian Maritime provinces of New Brunswick and Nova Scotia southwest to Alabama and westward to Minnesota and Oklahoma ( DeWalt et al. 2015).

Figures

Figs. 23–27. Leuctra tenuis. 23, 7th abdominal process, dorsal view, 350X, Maryland, Middle Fork; 24, 7th abdominal process, dorsal view, 350X, Maryland, Youghioghenny River; 25, 7th abdominal process, dorsal view, 350X, Massachusetts, Stillwater River; 26, paraprocts, caudal view, 500X, Indiana, tributary to West Fork Mosquito Creek; 27, paraprocts, caudal view, 1000X, Indiana, tributary to West Fork Mosquito Creek. sp = specillum, sa = subanal lobe.

Figs. 28–33. Leuctra tenuis. 28, paraprocts, lateral view, 500X, Alabama, Hillabee Creek; 29, paraprocts, lateral view, 500X, Massachusetts, Stillwater River; 30, paraprocts, lateral view, 500X, Maryland, Middle Fork; 31, paraprocts, lateral view, 2000X, Maryland, Middle Fork; 32, paraprocts, lateral view, 350X, Tennessee, Cosby Creek; 33, paraprocts, lateral view, 2000X, Tennessee, Cosby Creek. sp = specillum, sa = subanal lobe.