Leuctra triloba : Needham and Claassen 1925
Creators: name: Grubbs, Scott A.
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Leuctridae
Leuctra
Leuctra triloba

description: <i>Leuctra triloba</i> Claassen 1923 Three-lobed Needlefly http://lsid.speciesfile.org/urn:lsid: Plecoptera.specie sfile.org:TaxonName:462470 (Figs. 34‒42) <i>Leuctra triloba</i> Claassen 1923:258. Holotype &amp;male; (CUIC), McLean, New York <i>Leuctra triloba</i>: Needham and Claassen 1925:233 <i>Leuctra crosbyi</i>: Claassen 1937:45. Syn. Illies 1966 <i>Leuctra triloba</i>: Illies 1966:110 <i>Leuctra triloba</i>: Zwick 1973:408 <b>Male.</b> The 7th abdominal dorsal process bears three lobes, with the medial lobe terminating more posteriorly than the paired lateral lobes (Figs. 34‒ 36). The specilla are very broad basally, scarcely recurved anteriorly (Figs. 39, 41), and bear raised tubercles distally along outer margins (Figs. 37‒38, 40, 42). The subanal lobes are narrow throughout length, tapering and recurved anteriorly, and ca. 80% the length of the specilla (Figs. 39, 41). <b>Material examined</b>. <b>USA</b>, <b>Alabama</b>, Clay Co., tributary to West Fork Hatchet Creek, Talladega National Forest, 33.2912, -86.0723, 25 January 2006, A.L. Sheldon, 3&amp;male;, 2&amp;female; (WKUC); Mill Shoals Creek, Talladega National Forest, 33.4201, -85.8070, 6 November 2011, A.L. Sheldon, 1&amp;male; (WKUC); Cleburne Co., Dry Creek, 33.8725, -85.5811, 7 November 2011, A.L. Sheldon, 1&amp;male;, 5&amp;female; (WKUC). <b>North</b> <b>Carolina</b>, Burke Co., Linville River, above Linville Falls, 27 November 2002, 35.9541, -81.9279, S.A. Grubbs, 1&amp;male;, 3&amp;female; (WKUC); Haywood Co., Cold Springs Creek, Pisgah National Forest, 35.7785, - 82.9559, 2 March 2008, S.A. Grubbs, 1&amp;male;, 1&amp;female; (WKUC); tributary to Yellowstone Prong, 35.3219, - 82.8518, 24 October 2014, A.L. Sheldon, 3&amp;male;, 3&amp;female; (WKUC); Macon Co., Wine Spring Creek, Nantahala National Forest, 35.1761, -83.5897, 1 October 2013, A.L. Sheldon, 6&amp;male;, 10&amp;female; (WKUC); Sassafras Branch, Nantahala National Forest, 35.1895, -83.5939, 20 November 2013, A.L. Sheldon, 3&amp;male;, 7&amp;female; (WKUC). <b>Tennessee</b>, Marion Co., tributary to South Suck Creek, Prentice Cooper State Forest, 35.1597, -85.4065, 12 February 2007, S.A. Grubbs, 1&amp;male;, 2&amp;female; (WKUC); same locality but 31 January 2015, S.A. Grubbs, 1&amp;male; (WKUC); tributary to South Suck Creek, Prentice Cooper State Forest, 35.1474, - 85.3926, 12 February 2007, S.A. Grubbs, 1&amp;male;, 1&amp;female; (WKUC). <b>Distribution.</b> Canada: PQ. USA: AL, FL, NC, NY, SC, VA, WV (DeWalt et al. 2015), TN (new state record). <b>Remarks.</b> This species exhibits variability in the dorsal abdominal process, namely the size of the lateral lobes compared to the medial lobe (Hitchcock 1974, fig. 86). The dorsal processes depicted herein from Alabama (Fig. 34) and North Carolina (Fig. 35) are very similar to one form shown in Hitchcock (1974, fig. 86c). The Alabama and North Carolina populations are also very similar to the dorsal process in Claassen (1923, fig. 19) of the holotype male from New York. The males from Tennessee, however, bear a dorsal process that is different (Fig. 36) from specimens from Alabama and North Carolina, and similar to Hitchcock (1974, fig. 86b). The lateral lobes are smaller and can appear near-absent even under a dissecting microscope. Paraproct characteristics from the Alabama and North Carolina material were identical to the Tennessee males. This species has a narrow and long north-south distribution from Quebec to Florida (DeWalt et al. 2015). The sporadic nature of its known distribution is likely due to an adult emergence pattern that is mainly autumnal, a period with very low adult stonefly diversity and less frequented collecting efforts. This is the only species in the <i>L tenuis</i> group with an emergence period that extends through winter..
description: Published as part of <i>Grubbs, Scott A., 2015, Leuctra Schusteri, A New Stonefly Species (Plecoptera: Leuctridae) Of The L. Tenuis (Pictet) Group From The Southeastern Usa, pp. 147-166 in Illiesia 11 (12)</i> on page 159, DOI: 10.5281/zenodo.4752768
description: {"references": ["Claassen, P. W. 1923. New species of North American Plecoptera. Canadian Entomologist, 55: 257 - 263.", "Needham, J. G. &amp; P. W. Claassen. 1925. A monograph of the Plecoptera or stoneflies of America north of Mexico. Thomas Say Foundation, Entomological Society of America, 2: 1 - 397. Available online: https: // archive. org / details / monographofpleco 00 need", "Claassen, P. W. 1937. New species of stoneflies. Journal of the Kansas Entomological Society, 10: 42 - 51.", "Illies, J. 1966. Katalog der rezenten Plecoptera. Das Tierreich 82. Walter de Gruyter and Company, Berlin. 632 pp.", "Zwick, P. 1973. Insecta: Plecoptera, Phylogenetisches System und Katalog. Das Tierreich 94. Walter de Gruyter and Company, Berlin. 465 pp.", "DeWalt R. E., M. D. Maehr, U. Neu-Becker, &amp; G. Steuber. 2015. Plecoptera species file online. Version 5.0 / 5.0. Available online: http: // Plecoptera. SpeciesFile. org [retrieved 19 July 2015]", "Hitchcock, S. W. 1974. Guide to the insects of Connecticut. Part VII. The Plecoptera or stoneflies of Connecticut. Bulletin of the State Geological and Natural History Survey of Connecticut, 107: 1 - 262."]}