Isoperla pinta Frison 1937
Creators: name: Sandberg, John B.
name: Kondratieff, Boris C.
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlodidae
Isoperla
Isoperla pinta

description: <i>Isoperla pinta</i> Frison (Figs. 11 a-d) <i>Isoperla pinta</i> Frison 1937. Holotype &amp;male;, Oregon, Curry County, Floras Creek. <b>Male</b>. Aedeagus: sclerotized posterior process absent; body with one posterobasal lobe, one small posteroapical lobe, and a pair of anterolateral lobes (Fig. 11a); Mesoposterior area of ninth tergum with bipartite patches of long fine light spinulae mixed with patches of long clear setae (best viewed from lateral angle). 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 apices (Fig. 11c) apices usually secondarily barbed along ventral margin. Vesicle: rounded lobe, widest at base with broadly rounded apical margin (Fig. 11d). <i>Isoperla pinta</i> is very similar to <i>I. phalerata</i> Needham 1917, a species not known to occur in California. However, interestingly, Jewett (1954) designated the male allotype of <i>I. phalerata</i> from Union County, in northeastern Oregon, whereas the holotype locality of <i>I. pinta</i> is Curry County, in southwestern Oregon, bordering northern California (Frison 1937). <i>Isoperla phalerata</i> is presumably rarely collected and adults and larvae may be readily confused with <i>I. pinta</i>. At present, the most useful characters for separating adults of the two species include the pigment pattern of the head and pronotum (lighter <i>I. phalerata</i> vs. darker <i>I. pinta</i>) described in Szczytko &amp; Stewart (1979, figs. 56 &amp; 75); and variable cross veins between radial sector and M vein of forewings (one for <i>I. pinta</i> vs. more than one for <i>I. phalerata</i>) described in Smith (1917, fig. 65), Szczytko &amp; Stewart (1979, fig. 60), and Béthoux (2005, fig. 12). Both species lack a sclerotized aedeagal process, distinct aedeagal spinule patches, and possess wide and short lobe-like vesicles. Dissimilar to the <i>I. pinta</i> continuous tergal spinule band pattern described previously (Szczytko &amp; Stewart 1979, fig. 78); males observed in this study possess bipartite patches of fine light spinulae mixed with long clear setae. This generally matches the patch shape previously described for <i>I. phalerata</i> (Szczytko &amp; Stewart 1979, fig. 59). Additionally, the ventral barb of the paraproct was vestigial in many specimens. When vestigial, its ventral margin curved interiorly, was in line with adjacent connective membrane instead of protruding ventrally, and was discernible only by darker pigment than the surrounding ventral paraproct. <b>Additional Material Examined.</b> CALIFORNIA, Marin Co., Lagunitas Creek, 0.17 mi (0.3 km) N Jewell on Sir Francis Drake Blvd, N 38.03917°, W122.74611°, 04/II/2013, L. Serpa, 1 Larva, (JBSC). OREGON, Klamath Co., Sprague River, Hwy 140 unnamed access 4.74 mi (7.6 km) E Beatty, 42.44096°N, 121.18719°W, 19/ V /2013, J.B. Sandberg, B.C. Kondratieff, 10&amp;male;, 10&amp;female; (JBSC).
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 pages 51-53, DOI: 10.5281/zenodo.4760870
description: {"references": ["Frison, T. H. 1937. Studies of Nearctic aquatic insects. II. Descriptions of Plecoptera. Bulletin of the Illinois Natural History Survey, 21: 78 - 99.", "Jewett, S. G., Jr. 1954. New stoneflies (Plecoptera) from western North America. Journal of the Fisheries Research Board of Canada, 11: 543 - 549.", "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.", "Smith, L. W. 1917. Studies of North American Plecoptera (Pteronarcinae and Perlodini). Transactions of the American Entomological Society, 43: 433 - 489."]}