Alloperla biserrata Nelson & Kondratieff, 1980

Grubbs, Scott A. & Baumann, Richard W., 2019, Alloperla clarki sp. nov. (Plecoptera: Chloroperlidae), a new species from the eastern Nearctic with discussion of a new species group, Zootaxa 4624 (2), pp. 241-255 : 242-245

Alloperla biserrata Nelson & Kondratieff, 1980

Dusky Sallfly

http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org:TaxonName:3649

( Figs. 1–12 & 39 )

Alloperla biserrata Nelson & Kondratieff 1980:802 . Holotype male (USNM), spring-fed stream flowing into Craigs Creek , Montgomery Co., Virginia (examined)

Alloperla biserrata: Surdick 2004:12

Alloperla biserrata: Willett & Stark 2009:121

Distribution. USA: MD, PA, VA, WV ( DeWalt et al. 2018)

Material examined. USA, Maryland, Allegany Co., Biclic Run, Green Ridge State Forest , 39.66440, -78.46144, 13 May 1996, S.A. Grubbs, 1 male, 1 female ( WKUC) ; Deep Run, Green Ridge State Forest , 39.65312, -78.45234, 13 May 1996, S.A. Grubbs, 1 male ( WKUC) ; spring into Fifteenmile Creek, Green Ridge State Forest , 39.67138, -78.45970, 13 May 1996, S.A. Grubbs, 1 male ( WKUC) ; tributary to Fifteenmile Creek, Cow Hollow, Green Ridge State Forest , 39.69968, -78.47884, 13 May 1996, S.A. Grubbs, 1 male ( WKUC) ; tributary to Fifteenmile Creek, Little Pine Lick Hollow, Green Ridge State Forest , 39.68344, -78.47307, 13 May 1996, S.A. Grubbs, 1 male ( WKUC) ; tributary to Fifteenmile Creek, Green Ridge State Forest , 39.68658, -78.47720, 13 May 1996, S.A. Grubbs, 1 male, 1 female ( WKUC) ; tributary to Fifteenmile Creek, Cow Hollow, Green Ridge State Forest , 39.69910, -78.47831, 13 May 1996, S.A. Grubbs, 3 males, 2 females ( WKUC) ; tributary to Fifteenmile Creek, White Oak Hollow, Green Ridge State Forest , 39.70665, -78.48404, 13 May 1996, S.A. Grubbs, 1 male, 1 female ( WKUC) ; tributary to Black Sulphur Run, Green Ridge State Forest , 39.66716, -78.52963, 18 May 1996, S.A. Grubbs, 7 males, 4 females ( WKUC) ; Black Sulphur Run, Green Ridge State Forest , 39.66614, -78.49731, 18 May 1996, S.A. Grubbs, 5 males, 2 females ( WKUC) ; spring into Big Run, Green Ridge State Forest , 39.57145, -78.51005, 18 May 1996, S.A. Grubbs, 3 males, 2 females ( WKUC) ; Big Run, Rte. 51, Green Ridge State Forest , 39.52642, -78.53212, 18 May 1996, S.A. Grubbs, 17 males, 6 females ( WKUC) ; Big Run, Green Ridge State Forest , 39.57491, -78.50910, 18 May 1996, S.A. Grubbs, 12 males, 6 females ( WKUC) ; Deep Run, Green Ridge State Forest , 39.65312, -78.45234, 4 July 1996, S.A. Grubbs, 2 females ( WKUC) . Pennsylvania, Bedford Co., tributary to Bear Camp Branch, 11 km SSE Chaneysville, Buchanan State Forest , 39.72623, -78.45226, 14 May 1999, S.A. Grubbs, 1 male, 1 female ( WKUC) . Virginia, Augusta Co., Calf Pasture River , 10 June 1997, M.F. Whiting, 1 male ( BYU) ; Montgomery Co., Craigs Creek, Route 621, 0.5 miles off Route 460, 29 May 1979, B.C. Kondratieff, 2 males ( CHNC) ; same but 27 June 1979, B.C. Kondratieff, 1 male ( RFKC) ; same but 5 June 1983, B.C. Kondratieff, 3 males, 2 females ( BYU) ; Page Co., Jeremy Run, east of Vaughn , 8 May 2001, M. Terry, 1 male ( BYU) .

Amended description – Male. Tergum 10 divided mesally by epiproct and reduced cowl into two hemitergal lobes; lobes bearing dense matting of long setae ( Figs. 1–2 ). Epiproct length (L) 240 µm, maximum width ( MW) 47 µm, L:MW ratio = 5.1. In dorsal view the epiproct is widest in basal ⅓, tapering anteriorly to a slightly mediallyexpanded apex ( Figs. 1–2 ); dorsal surface covered by dense matting of long hairs in medial ⅓; apical ⅓ is entirely bare; in basal ⅓ there is only a medial line of hairs ( Figs. 1–4 ). The apical notch is narrowly triangular in shape and extends anteriorly and ventrally as a groove between paired, serrated apical margins; 5–6 distinct teeth are present ( Figs. 5–8 , 10, 12 ). In lateral view the epiproct is thin basally and gradually broadens apically ( Figs. 9, 11 ); matting is absent basally and along the ventral margins; long hairs deflected laterally are present in medial ½ ( Figs. 9, 11 ); shorter hairs on the apical, serrated portion are present as a medial band ( Figs. 10, 12 ). The stem length is approximately 2X the length of the apical serrated portion ( Figs. 9, 11 ). Overall, the SEM of the specimens studied herein from Maryland and Virginia are essentially identical in shape and matting patterns to the Virginia population studied in Willett & Stark (2009, their figs. 55–60).

Adult males (and females) are pale yellow in alcohol. The head lacks any darkened markings. The pronotum has a continuous pale yellow margin and the medial 75% of the segment is only slightly darker.

Comments. Reexamination of a specimen designated as a paratype produced an unexpected result. The male collected from “…confluence of Straley Branch with Poverty Creek off County Route 708, Montgomery Co., Virginia, Jefferson National Forest, altitude 630 m, 17 June 1978 ” ( Nelson & Kondratieff 1980, see pg. 802) is actually of A. stipitata . Alloperla biserrata occupies a relatively narrow latitudinal and longitudinal band in the southern and central Appalachian Mountains ( Fig. 39 ). Amongst the four members of the Alloperla nanina Group, this species is the only one known northward to Maryland and southern Pennsylvania.

Figures

FIGURES 1–8. Alloperla biserrata, adult male epiproct. 1, Maryland, Big Run, dorsal view, 300X; 2, Maryland, Black Sulphur Run, dorsal view, 1300X; 3, Maryland, Black Sulphur Run, dorsal view, 2500X; 4, Maryland, Black Sulphur Run, caudal view, 2500X; 5, Virginia, Craig Creek, lateral view, 3500X; 6, Virginia, Craig Creek, anterior view, 4500X; 7, Maryland, Black Sulphur Run, dorsal view, 5000X; 8, Virginia, Craig Creek, dorsal view, 2500X.

FIGURES 9–12. Alloperla biserrata, adult male epiproct. 9, Maryland, Black Sulphur Run, lateral view, 1500X; 10, Maryland, Black Sulphur Run, lateral view, 3500X; 11, Virginia, Craig Creek, lateral view, 1500X; 12, Virginia, Craig Creek, lateral view, 3500X.

FIGURE 39–40. 39, Distribution map of Alloperla biserrata (black circles) and A. nanina (yellow circles) based on material examined during this study and valid literature data. Type localities are referenced by the larger, open circles. 40, Distribution map of A. clarki sp. nov. (black circles) and Alloperla stipitata (yellow circles) based on material examined during this study and valid literature data. Type localities are referenced by the larger, open circles. GA = Georgia, KY = Kentucky, NC = North Carolina, OH = Ohio, PA = Pennsylvania, SC = South Carolina, TN = Tennessee, VA = Virginia, WV = West Virginia.