Stonefly Species Sweltsa pacifica (Sallflies)

Source: A Scanning Electron Microscopy Study Of The Epiprocts Of Western North American Sweltsa (Plecoptera: Chloroperlidae)

Male epiproct. Dorsal length ca. 490 - 530 µm, basal width ca. 137 - 157 µm, greatest width ca. 235 - 265 µm. Epiproct dorsoventrally flattened, broad basally becoming gradually wider, then abruptly widened into subtriangular apex terminating in small nipplelike point (Figs. 7 - 10); dorsum concave, apex slightly upturned. Dorsal surface bearing dense pile of short, multifilament setae except for glabrous margin around subapical triangular region (Figs. 10 - 11); ventral surface glabrous. Dorsal process. Located on tergum 8, some specimens bear slightly elevated ridge on tergum 9. Total width ca. 90 - 120 µm, median notch shallow, V-shaped. Process broad basally, lateral margins angled sharply to apex of projections (Fig. 12).