Isoperla sobria : Szczytko &amp; Stewart 1979
Creators: name: Sandberg, John B.
name: Kondratieff, Boris C.
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlodidae
Isoperla
Isoperla sobria

description: <i>Isoperla sobria</i> (Hagen) (Figs. 15 a-d) <i>Perla sobria</i> Hagen 1874. Holotype &amp;female;, “ Colorado mountains.” <i>Perla ebria</i> Hagen 1874. Holotype &amp;female;, “ Colorado mountains.” <i>Isoperla sobria</i>: Szczytko &amp; Stewart 1979. <b>Male.</b> Aedeagus: sclerotized posterior process absent; body of aedeagus typically with one anterior lobe and a pair of conical dorsal lobes (Figs. 15 a-c); in one male collected in copula, a small posteroapical lobe was present (Figs. 15 a-b); one long median patch of spinulae along posterior margin (Figs. 15 a-c). Abdominal terga 8-9, 9, 9-10: without stout spinulae or long stout setae. Posterolateral margins of at least abdominal segment 8 with scale-like setae clustered in brushes of several setae. Paraprocts: curved dorsally, length if straightened subequal to combined first and second cercal segments, tapering abruptly to blunt points (Fig. 15c). Vesicle: lobe barely perceptible, at best represented by an area of lighter pigment (Fig. 15d). <i>Isoperla sobria</i> is most similar to <i>I. miwok</i> (Table 1), with both included in the <i>I. sobria</i> complex (Bottorff et al. 1990). They differ most in the shape of the aedeagal spinule patch. In <i>I. sobria</i>, there is only one median patch on the posterobasal margin; in <i>I. miwok</i>, there is a posteroapical and a posterobasal patch, and the latter is concentrated into two nearly parallel bands. <i>Isoperla sobria</i> is distributed in higher elevation permanent streams in central to northcentral California. <i>Isoperla miwok</i>, as with <i>I. acula</i> and <i>I. adunca</i>, is usually associated with small intermittent streams of the Sierra Nevada foothills in north-central California, with one unconfirmed Lake County, Coastal Range location (Sandberg 2011b).
description: Published as part of <i>Sandberg, John B. &amp; Kondratieff, Boris C., 2013, The Isoperla Of California (Plecoptera: Perlodidae); Updated Male Descriptions And Adult Keys For 18 Western Nearctic Species, pp. 34-64 in Illiesia 9 (5)</i> on page 55, DOI: 10.5281/zenodo.4760870
description: {"references": ["Hagen, H. A. 1874. Report on the Pseudo-Neuroptera and Neuroptera collected by Lieut. W. L. Carpenter in 1873 in Colorado. Pp. 571 - 606. In F. V. Hayden (editor). Annual Report of the United States Geological and Geographical Survey of the Territories, embracing Colorado, being a Report of Progress of the Exploration for the year 1873. Government Printing Office, Washington, D. C. 688 pp.", "Szczytko, S. W. &amp; K. W. Stewart. 1979. The genus Isoperla (Plecoptera) of western North America; Holomorphology and systematics, and a new stonefly genus Cascadoperla. Memoirs of the American Entomological Society, 32: 1 - 120.", "Bottorff, R. L., S. W. Szczytko, &amp; A. W. Knight. 1990. Descriptions of a new species and three incompletely known species of western Nearctic Isoperla (Plecoptera: Perlodidae). Proceedings of the Entomological Society of Washington, 92: 286 - 303.", "Sandberg, J. B. 2011 b. The Isoperla of California (Plecoptera: Perlodidae); larval descriptions and a key to 17 western Nearctic species. Illiesia, 7: 202 - 258."]}