Soyedina sheldoni, Grubbs & Baumann, 2019

Grubbs, Scott A. & Baumann, Richard W., 2019, Soyedina Ricker, 1952 (Plecoptera: Nemouridae) in the eastern Nearctic: review of species concepts, proposed morphology-based species groups, and description of a new species from North Carolina, Zootaxa 4658 (2), pp. 223-250 : 241-244

publication ID

https://doi.org/10.11646/zootaxa.4658.2.2

publication LSID

lsid:zoobank.org:pub:A4D55B3B-9BE9-4918-89C6-8049F5895CF2

persistent identifier

https://treatment.plazi.org/id/B66387BE-F369-B37D-FF38-1604FDBFFD78

treatment provided by

Plazi

scientific name

Soyedina sheldoni
status

sp. nov.

Soyedina sheldoni sp. nov.

http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org:TaxonName:50713 7

( Figs. 65–78 View FIGURES 65–68 View FIGURES 69–74 View FIGURES 75–78 , 81 View FIGURE 81 )

Description. Macropterous. Male forewing length 4.5–6.0 mm, body length 6.5–8.5 mm (n=26); female forewing length 5.5–6.5 mm, body length 8.5–9.5 mm (n=11). General body color dark brown. Head dark brown except for a lighter medial area extending from the occiput anteriorly to, but not enclosing, the lateral ocelli, and extending into the ocellar triangle ( Fig. 65 View FIGURES 65–68 ). Legs light brown ( Fig. 65 View FIGURES 65–68 ). Wings fumose, venation typical for genus with veins A 1 and A 2 united near posterior margin. Cerci membranous ( Fig. 66 View FIGURES 65–68 ) and single-segmented. Gills absent.

Male. ( Figs. 65–67 View FIGURES 65–68 ; 69–78 View FIGURES 69–74 View FIGURES 75–78 ). 7 th and 8 th abdominal terga unmodified. Hypoproct well-developed, base covering medial ⅓ of 9 th sternum, constricted in basal half to plane of the base of the paraprocts; apical half tapered and set between base of outer paraproct lobes, distally tapered markedly to a lightly-sclerotized, narrowly-triangular terminus. Vesicle base partially obscured on preserved males by posterior margin of 8 th abdominal sternum; narrow basally, widest in medial ½, tapered apically; mean length (L): 0.031 mm, mean maximum width ( MW): 0.013 mm, mean L/ MW ratio: 2.45 (n=11). Paraprocts with two lobes, inner lobes difficult to discern with standard light microscopy on uncleared specimens, lightly sclerotized and inconspicuous, extending only slightly to base of recurved portion of outer lobes; outer lobes heavily sclerotized, large and robust for genus, in basal half appear bulbous in ventral view ( Fig. 67 View FIGURES 65–68 ) but essentially medially-concave in dorsal view ( Figs. 66 View FIGURES 65–68 , 76 View FIGURES 75–78 ); broadly rounded basally and dorsally ( Figs. 66 View FIGURES 65–68 , 77–78 View FIGURES 75–78 ); recurved in anterior 1/3, slightly concave laterally ( Figs. 66 View FIGURES 65–68 , 69 View FIGURES 69–74 , 76 View FIGURES 75–78 ) and dorsally ( Figs. 77–78 View FIGURES 75–78 ), terminating anteriorly in medially-directed triangular flaps ( Figs. 69–70 View FIGURES 69–74 , 77–78 View FIGURES 75–78 ). Epiproct typical for genus, exhibiting asymmetry with right half longer than left ( Figs. 69–70,74 View FIGURES 69–74 ); lateral arms short and lightly sclerotized, extending from near the distal terminus of the 10 th tergal sclerite to the basal cushion; ventral sclerites elongate and asymmetric, right longer than left ( Figs. 69–70 View FIGURES 69–74 ), studded with small teeth medially and laterally throughout length, tips typically rounded distally ( Figs. 71–72 View FIGURES 69–74 ); dorsal sclerite elongate and asymmetric, right longer than left ( Figs. 67 View FIGURES 65–68 , 69, 73–74 View FIGURES 69–74 ), appearing scaly at higher magnifications ( Figs. 71–72 View FIGURES 69–74 ), open apically, revealing an sclerotized inner member is either slightly tapered or straight-sided distally ( Figs. 71–73 View FIGURES 69–74 ).

Female. ( Fig. 68 View FIGURES 65–68 ). Typical of genus. Subgenital plate well-developed, subtriangular in shape; base broad, extending from posterior of seventh sternum entirely over eighth sternum and approximately ¼ over ninth sternum; apical portion darker than basal portion, terminating in broadly-rounded apex ( Fig. 68 View FIGURES 65–68 ).

Larva. Undescribed.

Type material. Holotype male ( INHS): USA, North Carolina, Yancey Co., Lower Creek, Buncombe Trail , Mount Mitchell State Park , 35.75564, -82.26803, 27 April 2019, M.L. Metzger & E.T. Metzger GoogleMaps . Paratypes: North Carolina, Macon Co., upper Ball Creek, Coweeta Hydrologic Laboratory , Nantahala National Forest , 35.03804, -83.45908, 20 March–7 April 1984, A.D. Huryn, 1 male ( BYU 1933 View Materials ) GoogleMaps ; same but 7–20 April 1984, A.D. Huryn, 2 males ( BYU 1934 View Materials ) ; same but same but 20 April–20 May 1984, A.D. Huryn, 1 male ( BYU 1936 View Materials ) ; Yancey Co., on road to Camp Alice (= Lower Creek ?), 25 May 1994, S.W. Szczytko, J.B. Sandberg & B.P. Stark, 1 male, 4 females ( BYU) ; seep (= Balsam Spring), near Mount Mitchell Summit, Mount Mitchell State Park , 35.76653, -82.26403, 28 April 2016, V. Holland, E. Fleek & S. Beaty, 1 male ( NCDWR) GoogleMaps ; Balsam Spring, near Mount Mitchell summit, Mount Mitchell State Park 35.76653, -82.26403, 25 April 2019, M.L. Metzger & E.T. Metzger, 1 male, 2 females ( WKUC) GoogleMaps ; spring along old railroad bed, Mount Mitchell State Park , 35.74395, -82.28172, 25 April 2019, M.L. Metzger & E.T. Metzger, 1 pharate male, 5 larvae ( WKUC) GoogleMaps ; tributary to Right Prong South Toe River, Buncombe Trail, Pisgah National Forest , 35.72718, -82.28379, 27 April 2019, M.L. Metzger & E.T. Metzger, 1 male ( WKUC) GoogleMaps ; Right Prong South Toe River, Buncombe Trail, Pisgah National Forest , 35.72900, -82.28331, 27 April 2019, M.L. Metzger & E.T. Metzger, 1 male, 1 female ( WKUC) GoogleMaps ; South Fork Upper Creek, Buncombe Trail, Pisgah National Forest , 35.73634, -82.27946, 27 April 2019, M.L. Metzger & E.T. Metzger, 4 males, 1 female ( WKUC) GoogleMaps ; seeps, Buncombe Trail, Pisgah National Forest , 35.74279, -82.27468, 27 April 2019, M.L. Metzger & E.T. Metzger, 4 males, 1 female ( WKUC) GoogleMaps ; Lower Creek, Buncombe Trail, Mount Mitchell State Park , 35.75564, -82.26803, 27 April 2019, M.L. Metzger & E.T. Metzger, 2 males, 1 female ( WKUC) GoogleMaps ; tributary to Lower Creek, Commissary Trail, Mount Mitchell State Park , 35.75630, -82.26460, 27 April 2019, M.L. Metzger & E.T. Metzger, 3 males, 1 female ( WKUC) GoogleMaps ; Lower Creek, Camp Alice, Mount Mitchell State Park , 35.75953, -82.26683, 27 April 2019, M.L. Metzger & E.T. Metzger, 1 male, 1 female ( WKUC) GoogleMaps ; tributary to Hemphill Creek, FS 472, Pisgah National Forest , 35.71005, -82.24959, 28 April 2019, M.L. Metzger & E.T. Metzger, 1 male ( WKUC) GoogleMaps .

Additional material examined. USA, North Carolina, Haywood Co., Yellowstone Prong, Trail 440, 35.32250, -82.83357, 26 May 2014, A.L. Sheldon, 1 male ( WKUC) GoogleMaps ; Macon Co., upper Ball Creek, Coweeta Hydrologic Laboratory , Nantahala National Forest , 35.03804, -83.45908, 20 March 1984, A.D. Huryn, 1 male ( WKUC) GoogleMaps ; same but 8–20 April 1984, A.D. Huryn, 1 male ( ADHC) ; same but 20 April–2019 April 1984, A.D. Huryn, 1 male ( ADHC) ; but 21 April 1984, A.D. Huryn, 1 male ( ADHC) ; Rattlesnake Springs, near Wayah Bald, Nantahala National Forest , 35.17060, -83.57741, 23 March 2002, S.A. Grubbs, 1 male ( WKUC) GoogleMaps ; Mitchell Co., tributary to Holder Creek, FS 130A, Roan Mountain , 36.10178, -82.12650, 19 May 2014, 3 males (WKUC—sacrificed for SEM) GoogleMaps ; Holder Creek, FS 130A, Roan Mountain , 36.10060, -82.12862, 19 May 2014, A.L. Sheldon, 5 males, 3 females ( WKUC) GoogleMaps ;

Etymology. This species is named in honor of the late Dr. Andrew Sheldon. Andy was a close working colleague of both authors and was responsible for collecting the first series of specimens of this new species. Mountain Man Forestfly is proposed as the common name for this species ( Stark et al. 2012).

Diagnosis. The combination of the (a) nearly straight-sided sclerotized inner epiproct member ( Figs. 71–72 View FIGURES 69–74 ), (b) apically-rounded ventral sclerites ( Figs. 69–70 View FIGURES 69–74 ), and (c) robust outer paraproct lobe that is medially-concave and has a prominent, anteriorly-directed triangular flap ( Figs. 76–78 View FIGURES 75–78 ) readily distinguishes S. sheldoni sp. nov. from all other eastern Nearctic Soyedina with some form of an anterior projection on the outer paraproct lobe. Several spe- cies of eastern Soyedina have a spur or flap present on the outer paraproct lobe. These include S. amicalola ( Fig. 56 View FIGURES 51–56 ; Verdone et al. 2017, their figs. 5, 8), two distinct phenotypes of S. carolinensis ( Figs. 33–34 View FIGURES 31–34 ), S. kondratieffi ( Figs 63–64 View FIGURES 57–64 ), the more subtle spur exhibited by S. merritti ( Fig. 41 View FIGURES 35–42 ), and the geographically-consistent shape present on S. washingtoni ( Figs. 49–50 View FIGURES 43–50 ). Hence, the presence alone of a spur is not diagnostic for species-level determinations of eastern Soyedina .

The outer paraproct lobe of S. sheldoni sp. nov. ( Figs. 77–78 View FIGURES 75–78 ) is similar only to S. amicalola ( Fig. 56 View FIGURES 51–56 ; Verdone et al. 2017, their figs. 5, 8), but two epiproct characteristics distinguish these two species. First, the ventral sclerites of S. sheldoni sp. nov. are typically rounded apically ( Figs. 69–70 View FIGURES 69–74 ) yet subtriangular on S. amicalola ( Fig. 51 View FIGURES 51–56 ). Second, the nr. straight-sided sclerotized inner epiproct member of S. sheldoni sp. nov. ( Figs. 71–73 View FIGURES 69–74 ) is easily distinct from the apically-triangular and caudally-split inner member of S. amicalola ( Figs. 53–55 View FIGURES 51–56 ).

Remarks. Soyedina sheldoni sp. nov. is presently known from the southern Appalachian Highlands region in western North Carolina ( Fig. 81 View FIGURE 81 ). The holotype locality and most paratype localities are positioned in the High Mountains Level IV (66i) Ecoregion. This region is characterized by disjunct high-elevation Appalachian landscapes with remnant patches of red spruce ( Picea rubens Sargent, 1898 ) and Frasier fir ( Abies fraseri Pursh, 1817 ) ( Griffith et al. 2002). Paraleuctra sara (Claassen, 1937) was the only other stonefly species collected with S. sheldoni sp. nov. at the type locality.

MW

Museum Wasmann

INHS

Illinois Natural History Survey

BYU

Monte L. Bean Life Science Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Plecoptera

Family

Nemouridae

Genus

Soyedina