taxonID	type	description	language	source
03EB7113FFC35D13FF4DF660FDD4FBB3.taxon	description	Male. Forewing length 5.5 – 6.5 mm. General body color and wings brown. Cerci tubular and unmodified. Abdominal terga 1 – 6 unmodified. Lateral portion of abdominal segment 7 darkly sclerotized, conjoining medially into a near-parallel sided dorsal process that is ca. ½ segment width and truncate distally except for a pair of small lateral notches that give the process a slightly trilobed appearance, ends of the medial and lateral lobes terminate along the same distal plane (Figs. 1 A, 3 A); lateral margins of abdominal segment 8 darkly sclerotized and conjoin medially only into a thin band anteriorly (Figs. 1 A – 1 B). Epiproct sclerite narrow throughout length, expanded slightly and rounded distally. In lateral view the inner paraproct lobes are broad basally, simple, and rounded; with low tubercules present on both inner and outer margins distally (Fig. 2 A – 2 B); both the anterolateral and posteromedial portions are slightly concave. Outer paraproct lobes are broadest basally, simple and narrow, tapered distally and recurved slightly (Fig. 2 A). Vesicle small and subtriangular (Fig. 1 C). Female. Forewing length 7.0 – 7.5 mm. Body color and cerci similar to male. Lobes of subgenital plate distally subtruncate, posterolateral corners rounded marginally and mediolateral corners slightly angular; lobes separated by a V-shaped notch (Fig. 1 D). Nymph. Unknown.	en	Grubbs, Scott A. (2010): Leuctra usdi, a new stonefly (Plecoptera: Leuctridae) of the L. tenuis (Pictet) species group from the southeastern U. S. A. plus three new Alabama state records. Zootaxa 2498: 59-64, DOI: 10.5281/zenodo.195776
03EB7113FFC35D13FF4DF660FDD4FBB3.taxon	materials_examined	Material examined. Holotype male, U. S. A., Tennessee, Williamson Co., spring into Pinewood Branch, Leipers Fork, West Fork Harpeth River, 4 km W Leipers Fork, 35.8944 °, - 87.03878 °, 15 III 2003, S. A. Grubbs (SAG) and D. E. King (INHS). Paratypes: same as Holotype but 1 male, 1 female (WKU); same as Holotype but 5 III 2007, 3 males, 2 females, SAG (WKU); Mayfield Spring, 9 km NW Leipers Fork, 35.9558 °, - 87.0754 °, 5 III 2007, 1 male, 1 female, SAG (WKU). Alabama, Limestone Co., spring into unnamed tributary to Scarce Grease Branch, Sugar Creek, 2 km SE Lester, 34.9806 °, - 87.1309 °, 18 II 2008, 2 males, SAG (WKU).	en	Grubbs, Scott A. (2010): Leuctra usdi, a new stonefly (Plecoptera: Leuctridae) of the L. tenuis (Pictet) species group from the southeastern U. S. A. plus three new Alabama state records. Zootaxa 2498: 59-64, DOI: 10.5281/zenodo.195776
03EB7113FFC35D13FF4DF660FDD4FBB3.taxon	etymology	Etymology. The specific epithet is a Cherokee word for “ small ” or “ little ”, a reference to the diminutively-sized spring seep type locality. The Cherokee Native Americans formerly inhabited central Tennessee and northern Alabama. FIGURES 3 A – F. Scanning electron micrographs, male sclerotized process of 7 th abdominal segment, dorsal view, 350 X. A, Leuctra usdi, sp. nov.; B, L. carolinensis (U. S. A., Maryland, Garrett Co., spring into Little Laurel Run, Savage River State Forest, 21 VI 1996); C, L. tenella (U. S. A., Pennsylvania, Westmoreland Co., spring into Powdermill Run, Powdermill Nature Reserve, 3 VI 1993); D, L. tenuis (U. S. A., Maryland, Allegany Co., Deep Run, Green Ridge State Forest, 7 VIII 1998); E, L. triloba (U. S. A., Alabama, Clay Co., tributary to West Fork Hatchet Creek, Talladega National Forest, 25 I 2006); F, L. variabilis (U. S. A., Tennessee, Carter Co., Twin Springs, Cherokee National Forest, 29 XI 2002).	en	Grubbs, Scott A. (2010): Leuctra usdi, a new stonefly (Plecoptera: Leuctridae) of the L. tenuis (Pictet) species group from the southeastern U. S. A. plus three new Alabama state records. Zootaxa 2498: 59-64, DOI: 10.5281/zenodo.195776
03EB7113FFC35D13FF4DF660FDD4FBB3.taxon	diagnosis	Diagnosis. The combination of the well-defined process on the 7 th abdominal tergum, smooth outer margins of the inner paraproct lobes and a small triangular vesicle places L. usdi in the L. tenuis species group (Harper & Harper 1997) with L. tenuis, L. carolinensis Claassen, 1923, L. tenella Provancher, 1878, L. triloba Claassen, 1923 and L. variabilis Hanson, 1941. Harper & Harper (1997) describe the dorsal process as “ … notably beady in appearance … ” which under higher magnification is manifested as raised scale-like structures distally (Figs. 3 A – 3 F). The inner and outer paraproct lobes of L. usdi are generally similar to L. triloba and L. variabilis (Figs. 2 A – 2 F). All three species possess a small concavity in the anterolateral and posteromedial regions of the inner lobes. The inner lobes of L. usdi and L. triloba similarly have raised tubercles distally (Figs. 2 A – 2 D) and the outer lobes are simple and recurved slightly (Figs 2 A and 2 C). The outer lobe of L. variabilis is not recurved as in L. usdi and L. triloba and the inner lobe tip bears fewer tubercules compared to the two other species. Nelson et al. (2002; Fig. 2) also showed that the outer lobes of L. variabilis from eastern Maryland were sickle-like and not recurved.	en	Grubbs, Scott A. (2010): Leuctra usdi, a new stonefly (Plecoptera: Leuctridae) of the L. tenuis (Pictet) species group from the southeastern U. S. A. plus three new Alabama state records. Zootaxa 2498: 59-64, DOI: 10.5281/zenodo.195776
03EB7113FFC35D13FF4DF660FDD4FBB3.taxon	discussion	Remarks. The type locality is a small spring seep emanating from a hillslope in central Tennessee. This habitat is also the type locality for Soyedina alexandria Grubbs, 2006. Leuctra usdi and S. alexandria were collected together in both 2003 and 2007. Allocapnia rickeri Frison, 1935 and S. alexandria were obtained with L. usdi from the Alabama locality.	en	Grubbs, Scott A. (2010): Leuctra usdi, a new stonefly (Plecoptera: Leuctridae) of the L. tenuis (Pictet) species group from the southeastern U. S. A. plus three new Alabama state records. Zootaxa 2498: 59-64, DOI: 10.5281/zenodo.195776
