Leuctra tenella Provancher 1878

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 : 154-156

Leuctra tenella Provancher 1878

Broad-lobed Needlefly

http://lsid.speciesfile.org/urn:lsid: Plecoptera .specie sfile.org:TaxonName:460049

( Figs. 19–22 )

Leuctra tenella Provancher 1878:126 . No type designation, vicinity of Quebec City

Leuctra tenuis Provancher 1876:218 . Not L. tenuis Pictet

Leuctra hamula Claassen 1923:261 . Syn. Ricker 1952 Leuctra hamula : Needham and Claassen 1925:229 Leuctra (Leuctra) tenella : Ricker 1952:171. Lectotype ♂ designated.

Leuctra tenella : Illies 1966:109

Male. The 7th abdominal dorsal process bears a simple, broadly-subtriangular lobe ( Fig. 19 ); subtle anterolateral lobes present on some specimens. The specilla are broad basally, overall shape subtriangular and bearing prominent, laterallydirected tubercles distally ( Figs. 20–22 ). The subanal lobes are subequal in length to the specilla; near uniformly-narrow through length, tapering little but recurved anteriorly in the distal half, especially at tips ( Figs. 21–22 ).

Material examined. Canada, New Brunswick, Carleton Co., Gibson Creek, Hwy 105, Northampton , 15 June 1993, R. W. Baumann & B.C. Kondratieff, 1♂ ( BYUC) ; Kent Co., South Fork, Coal Branch River , Hwy 126, Coal Branch , 12 June 1998, R. W. Baumann & B.C. Kondratieff, 1♂ ( BYUC) . USA, Maryland, Frederick Co., tributary to Tuscarora Creek , 39.5601, -77.4827, 3 June 1997, S.A. Grubbs, 7♂, 2♀ ( WKUC) ; Garrett Co., Black Lick Run, Savage River State Forest , 39.6098, - 79.0827, 17 May 1995, S.A. Grubbs, 1♂ ( WKUC) ; Poplar Lick Run, Poplar Lick ORV Trail , Savage River State Forest , 39.6124, -79.1494, 24 May 1996, S.A. Grubbs, 4♂ ( WKUC) . New Hampshire, Grafton Co., headwaters, Hubbard Brook , at road, 25 June 1974, S.B. Fiance, 17♂ ( BYUC) . New York, Oswego Co., Little Sandy Creek, Hwy. 13, east of Lacona , 17 June 1997, R. W. Baumann & B.C. Kondratieff, 12♂, 8♀ ( BYUC) . North Carolina, Haywood Co., tributary to Flat Laurel Creek, Little Sam Trail, Pisgah National Forest , 35.3167, - 82.8918, 22 July 2015, A.L. Sheldon, 2♂ ( WKUC) ; tributary to Flat Laurel Creek, Pisgah National Forest , 35.3230, -82.8982, 22 July 2015, A.L. Sheldon, 1♂ ( WKUC) ; Flat Laurel Creek, Pisgah National Forest , 35.3244, -82.8960, 22 July 2015, A.L. Sheldon, 1♂ ( WKUC) ; Macon Co., Wine Spring Creek, Nantahala National Forest , 35.8791, - 83.5979, 28 May 2014, A.L. Sheldon, 1♂ ( WKUC) . Ohio, Hocking Co., tributary to Pine Creek, Hocking State Forest , 39.4468, -82.5850, 26 May 2010, S.A. Grubbs, 2♂ ( WKUC) . Pennsylvania, Bedford Co., Bear Gap Run, 7 km ESE Centerville, Buchanan State Forest , 39.8111, -78.5669, 14 May 1999, S.A. Grubbs, 1♂ ( WKUC) ; Westmoreland Co., spring into Powdermill Run, Powdermill Nature Reserve , 3 June 1993, S.A. Grubbs, 24♂, 24♀ ( WKUC) . Vermont, Lamoille Co., Big Spring, Hwy 108, south of Smugglers Notch , 15 July 1998, R. W. Baumann, 3♂ ( BYUC) . Virginia, Giles Co., Big Stony Creek, Hwy 635, 24 May 1990, S.W. Szczytko, 1♂, 1♀ ( BYUC) . West Virginia, Tucker Co., seep below Watershed 3, Fernow Experimental Forest , 2 June 1991, S.A. Grubbs, 2♂ ( WKUC) .

Distribution. Canada: LB, NB, NS, ON, PQ. USA: CT, MA, MD, ME, MN, NJ, NY, OH, PA, WI, WV ( DeWalt et al. 2015), NC, NH, VA, VT (new state records).

Remarks. The dorsal abdominal process of this species is most similar to L. carolinensis . The specilla of L. tenella are distally truncate ( Figs. 21– 22 ) compared to the distally-subtriangular tips of L. carolinensis ( Figs. 4, 7, 9 ). The subanal lobes of L. tenella are sharply-recurved at the tips ( Figs. 21–22 ), contrasting with the gradually-recurved lobes in the distal half on L. carolinensis ( Figs. 4, 6‒9 ).

Figures

Figs. 19–22. Leuctra tenella, Pennsylvania, spring into Powdermill Run. 19, 7th abdominal process, dorsal view, 350X; 20, paraprocts, caudal view, 1000X; 21, L. tenella, paraprocts, lateral view, 350X; 22, L. tenella, paraprocts, lateral view, 1500X. sp = specillum, sa = subanal lobe.

Figs 4–9. Leuctra carolinensis. 4, paraprocts, lateral view, 900X, Connecticut, tributary to Beaver Brook; 5, paraprocts, dorsal view, 1000X, Alabama, tributary to Ross Branch; 6, paraprocts, lateral view, 350X, Maryland, Bull Glade Run; 7, paraprocts, lateral view, 1000X, Maryland, Bull Glade Run; 8, paraprocts, lateral view, 350X, Alabama, tributary to Ross Branch; 9, paraprocts, lateral view, 1000X, Alabama, tributary to Ross Branch. sp = specillum, sa = subanal lobe.