Isoperla baumanni Szczytko &amp; Stewart 1984
Creators: name: Sandberg, John B.
name: Kondratieff, Boris C.
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlodidae
Isoperla
Isoperla baumanni

description: <i>Isoperla baumanni</i> Szczytko &amp; Stewart (Figs. 3 a-d, 20 a) <i>Isoperla baumanni</i> Szczytko &amp; Stewart 1984. Holotype &amp;male;, California, Plumas County, Domingo Spring, Domingo Spring Campground, 6 mi NW Chester. <b>Male</b>. Aedeagus: sclerotized posterior process absent; body with one posterobasal lobe, one posteromedian lobe and expanded apex, apex deeply inverted (Fig. 3a); one large patch of spinulae concentrated below posteromedian lobe (Fig. 3b), and a long thin patch along posteroapical margin (Fig. 3c). 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 first cercal segment, tapering abruptly to blunt apices (Fig. 3c). Vesicle: rounded lobe, widest at base with broadly rounded apical margin (Fig. 3d). The males of <i>I</i>. <i>baumanni</i> and <i>I. tilasqua</i> are very similar, with the exception of recently preserved specimens. Males of <i>I. baumanni</i> have yellow abdominal pigmentation which can be easily separated from the much darker <i>I. tilasqua</i>. The aedeagal spinulae and lobe characters are very similar; both species possess one large patch of spinulae concentrated below the posteromedian lobe, a long thin patch along posteroapical margin, and bulbous apex deeply inverted (Figs. 3 a-c, 17a-c). <i>Isoperla tilasqua</i> differs slightly from <i>I. baumanni</i> (live everted) by usually possessing a pair of small apicolateral lobes (similar to <i>I. sobria</i> (Hagen 1874)). Males of both species may be identified using the thin extended apical lobe characters illustrated in Szczytko &amp; Stewart (1979, fig. 116; 1984, fig. 53); <i>I. baumanni</i> has only one extended tube-like lobe and <i>I. tilasqua</i> has two. Sandberg (2011b) suggested that extended lobes are normally inverted internal structures, and evert only when using the KOH clearing-eversion method for preserved males (Szczytko &amp; Stewart 1979). These lobes could not be everted using the live eversion, hot water fixing, and KOH clearing methods described in this study. The aedeagi of live everted <i>I</i>. <i>baumanni</i> and <i>I</i>. <i>tilasqua</i> were cleared in KOH to detect the inverted tube-like processes. The internal membrane of a single inverted apical process was visible inside the aedeagus of <i>I</i>. <i>baumanni</i> after clearing (Fig. 20a). The apical inverted process could only be partially everted for <i>I. baumanni</i>, with the longitudinally striated apex remaining inverted. For <i>I. tilasqua</i>, a pair of inverted tube-like processes could be observed within the aedeagus, but could not be everted after clearing (Fig. 20f). The <i>I. baumanni</i> aedeagal shape, stout spinule patches, paraproct and vesicle shape are also similar to <i>I. gravitans</i> (Needham &amp; Claassen 1925) in Szczytko &amp; Stewart (1979, figs. 106-110). Sandberg (2011b) also had difficulty separating <i>I. baumanni</i> from <i>I. tilasqua</i> nymphs using lacinia characters and tentatively placed <i>I. baumanni</i> into the <i>I. sobria</i> species complex. The three species appear to have locally restricted distributions and further study will be necessary to understand species limits of <i>I. baumanni, I. tilasqua,</i> and <i>I. gravitans</i>.
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 43, DOI: 10.5281/zenodo.4760870
description: {"references": ["Szczytko, S. W. &amp; K. W. Stewart. 1984. Descriptions of Calliperla Banks, Rickera Jewett, and two new western Nearctic Isoperla species (Plecoptera: Perlodidae). Annals of the Entomological Society of America, 77: 251 - 263.", "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.", "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.", "Needham, J. G. &amp; P. W. Claassen. 1925. A monograph of the Plecoptera or stoneflies of America north of Mexico. Thomas Say Foundation, 397 pp."]}