Isoperla acula Jewett 1962
Creators: name: Sandberg, John B.
name: Kondratieff, Boris C.
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlodidae
Isoperla
Isoperla acula

description: <i>Isoperla acula</i> Jewett (Figs. 1 a-d) <i>Isoperla acula</i> Jewett 1962. Holotype &amp;male;, California, Fresno County, Dry Creek, 7 mi NE Academy. <b>Male</b>. Aedeagus: sclerotized posterior process absent; body a long recurved tube without major lobes, tapering to a multi-lobed apex (Fig. 1a); a pair of long, nearly parallel patches of fine spinulae along posteroapical margin (Figs. 1 a-b). Ninth tergum with mesoposterior bipartite to oval patches of stout dark spinulae and long fine scattered setae, tenth tergum with only a few small spinulae (Fig. 1c). Posterolateral margins of at least abdominal segment 8 with scale-like setae clustered in brushes of several setae (Fig. 1d inset). Paraprocts: curved dorsally, length if straightened longer than combined first and second cercal segments, tapering gradually to long sharp apices (Fig. 1c). Vesicle: rectangular, length half as long as wide (Fig. 1d). The male of <i>I. acula</i> (<i>I. quinquepunctata</i> complex) is most similar to <i>I. mormona</i> and <i>I. quinquepunctata</i>, all lacking an aedeagal sclerotized process (Table 1). However, the similarity in other male taxonomic characters of the three species varies with <i>I. acula</i> and <i>I. mormona</i> possessing patches of fine spinulae near the apex of aedeagus; vesicle shape varies from lobelike (<i>I. quinquepunctata</i>) to rectangular (<i>I. acula</i>) and trapezoidal (<i>I. mormona</i>); abdominal terga 9-10 variable posteriorly with patches of stout setae (<i>I. quinquepunctata</i>) or patches of stout spinulae and scattered long setae (<i>I. acula</i>, <i>I. mormona</i>); paraproct length&gt; than first and second cercal segments (<i>I. acula</i>) or subequal to first and second cercal segments (<i>I. mormona</i>, <i>I. quinquepunctata</i>); and paraproct shape variable, tapering gradually to sharp apices (<i>I. acula</i>), tapering abruptly to blunt apices (<i>I. mormona</i>) and in <i>I. quinquepunctata</i>, tapering gradually to blunt apices. The current study <i>I. acula</i> description agrees with those of Jewett (1962), Szczytko &amp; Stewart (1979), and Bottorff et al. (1990). <b>Additional Material Examined.</b> CALIFORNIA, Shasta Co., Rock Creek, West Redding, 05/ VI /2011, larvae, (ABLC).
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 41, DOI: 10.5281/zenodo.4760870
description: {"references": ["Jewett, S. G., Jr. 1962. New stoneflies and records from the Pacific Coast of the United States. The Pan-Pacific Entomologist, 38: 15 - 20.", "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."]}