Bolshecapnia gregsoni
Creators: name: Broome, Hannah Jean
name: Stark, Bill P.
name: Baumann, Richard W.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Capniidae
Bolshecapnia
Bolshecapnia gregsoni

description: <i>Bolshecapnia gregsoni</i> (Ricker, 1965) http://lsid.speciesfile.org/urn:lsid: Plecoptera.speciesfile.org: TaxonName:5037 (Figs. 1-6) <i>Capnia</i> (<i>Bolshecapnia</i>) <i>gregsoni</i> Ricker, 1965:479. Holotype &amp;male; (Canadian National Collection), Kokli Lake between Mount Arrowsmith and Mount Kokli Vancouver Island, British Columbia <i>Bolshecapnia gregsoni</i>: Ricker &amp; Scudder, 1975:338 <b>Distribution. CANADA: BC</b> (DeWalt et al. 2018) <b>Material examined. CANADA: British Columbia: Kokli Lake, between Mount Arrowsmith and Mount Kokli, near Cameron Lake, Vancouver Island, 9 June 1957, F. Neave, W.E. Ricker, Holotype &amp;male;, 21 paratypes (CNC).</b> Lake on Mount Arrowsmith, Vancouver Island, 9 June 1957, F. Neave, W.E. Ricker, 1&amp;male;, 1&amp;female; (INHS, paratypes). Head of Gwillim Creek near Glacier Lakes, near Camp 3 on Gladsheim Massef, NW of Slocan City, 22-31 July 1958, J. Ricker, 1&amp;female; (CNC). Garibaldi Lake, Spring Glacier on new snow, 18 April 1966, K. Ricker, N. Hansen, M. Shakespeare, 2&amp;male;, 1&amp;female; (CNC). Garibaldi Park, 14 May 1958, J. Ricker, 6&amp;male;, 2&amp;female; (CNC). Helen Lake, Garibaldi Park, 12 May 1951, J. Barton, 1 &amp;female; (CNC). Mount Alava Base Camp Snowfields, 24-31 July 2010, J. Cullington, 6&amp;female; (RBCM). <b>Male epiproct</b> (n = 3). Length 544-593 μm, width at midlength 185-213 μm, greatest width near base 147-253 μm. A pair of curved, acute, sclerotized hooks arise from either side of the median groove at about half the distance between the epiproct apex and the base of the spongy area from either side of the median groove. The hooks extend slightly beyond lateral margins of the epiproct body (Figs. 1-3), and their tips reach to about 0.8 of the epiproct length. Median groove wide near apex and narrowed near dorsobasal knobs (Fig. 4). Median groove divides a pair of spongy-appearing clumps of tissue near hooks (Fig. 2). Apex without a protruding membranous process; dorsobasal humps low, smooth and not outlined by a prominent posterodorsal ridge (Fig. 2-3). Paraprocts with a hairy, plate-like basal area and slender apices. <b>Tergal process</b> (n = 3). Absent, but tergum 9 bears a median patch of short, thick setae (Fig. 1) and lacks a median anterior notch. However, tergum 10 bears a median anterior notch filled with membranous tissues projecting into the notch from tergum 9 (Fig. 7). <b>Vesicle</b> (n = 1). Length 305 μm, width at midlength 311 μm, basal stalk short and 168 μm wide. Surface entirely covered with thick setae except for the short stalk that extends under the basal roll of tissue (Fig. 4). <b>Female subgenital plate</b> (n = 2). This structure is a triangular plate that extends beyond the anterior margin of sternum 9 (see fig. 10 in Ricker 1965, fig. 173 in Baumann et al. 1977, and fig. 3.12 in Stewart &amp; Oswood 2006). The images we present show an almost triangular plate, rounded and glabrous at the apex with convergent lateral margins (Figs. 5- 6). The transverse striations observed on the subgenital plate in Fig. 6 may be an artifact of dehydration. <b>Larva.</b> Unknown. <b>Comments.</b> The figures and descriptions of the male of this species by Ricker (1965) and Stewart &amp; Oswood (2006), and our SEM figures indicate that it is related to <i>B. milami</i> and <i>B. spenceri.</i> Ricker (1965) states the species “…is closely related to <i>C. spenceri …</i> ”. The two species are thought to be allopatric in British Columbia with the western limit of <i>B. spenceri</i> extending into the Selkirk Mountains and the eastern limit of <i>B. gregsoni</i> extending to the Valhalla range (Ricker 1965). According to Ricker (1965) the major distinction between <i>B. gregsoni</i> and <i>B. spenceri</i> males is the presence of a “deep groove” that extends posteriorly from the midpoint of tergum 9 in males of the latter; females of <i>B. spenceri</i> have a very narrow, and often asymmetrical, subgenital plate (figs. 15-16 in Ricker 1965). Males of these species each have epiprocts with a pair of sharply pointed, sclerotized hooks near midlength and conspicuous, spongy-appearing dorsal patches of anterolateral tissue (Figs. 3, 9, 21, 28), consequently these two capniid species have the distinction of being relatively easy to distinguish as females and somewhat more difficult to distinguish as males. The epiprocts of <i>B. milami</i> differ from the other two species in having a downturned mesoapical hook. The original material of <i>B. gregsoni</i> reported by Ricker (1965) includes 21 &amp;male; and 30 &amp;female; specimens; most of these were collected from Vancouver Island at “…sites at or near high mountain lakes” (Ricker 1965).
description: Published as part of <i>Broome, Hannah Jean, Stark, Bill P. &amp; Baumann, Richard W., 2019, A Review Of The Genus Bolshecapnia Ricker, 1965 (Plecoptera: Capniidae), And Recognition Of Two New Nearctic Capniid Genera, pp. 1-26 in Illiesia 15 (1)</i> on pages 6-9, DOI: 10.5281/zenodo.4761256
description: {"references": ["Ricker, W. E. 1965. New records and descriptions of Plecoptera (Class Insecta). Journal of the Fisheries Research Board of Canada, 22: 475 - 501. https: // doi. org / 10.1139 / f 65 - 045", "DeWalt, R. E., M. D. Maehr, U. Neu-Becker &amp; G. Stueber. 2018. Plecoptera Species File Online. Version 5.0 / 5.0. [Accessed 19 April 2018]. http: // Plecoptera. SpeciesFile. org", "Baumann, R. W., A. R. Gaufin, &amp; R. F. Surdick. 1977. The Stoneflies (Plecoptera) of the Rocky Mountains. Memoirs of the American Entomological Society, Number 31. American Entomological Society at the Academy of Natural Sciences Philadelphia. Philadelphia, Pennsylvania. 208 pp. https: // biodiversitylibrary. org / page / 38652706"]}