Stonefly Species Salmoperla sylvanica (Bighead Springflies)

Source: Description Of The Male Terminalia Of Two Western Nearctic Perlodinae (Pictetiella Expansa (Banks) And Salmoperla Sylvanica Baumann & Lauck)

Description: Male. For a habitus description refer to Baumann and Lauck (1987). Head and pronotum shown in (Fig. 12). Ninth tergum with pair of lateral humps (LH), apices covered in sensilla basiconica, lateral margins covered in long fine hairs (Fig. 13). Tenth tergum deeply cleft, membranous with a large basal anchor (BA) which extends to base of the epiproct cowl (Fig. 14). Epiproct cowl (EC) membranous with sparse setae (Fig. 13) and flanked by two rectangular paragenital plates (PP) at base (Fig. 14). Hemitergal lobes (HL) rounded produced inward, sclerotized and flattened at apices bearing sensilla basiconica anteriorly and fine hairs posteriorly (Fig. 14). Epiproct short, boxlike in dorsal aspect, basal portion slightly narrowed, covered in backward directed scale-like setae, setae absent on apex (Figs. 15, 16). Lateral stylets short, broad and darkly sclerotized terminating in outward directed hooks, present laterally at epiproct base (Fig. 16). Aedeagus with pair of large posterolateral lobes at base (Fig. 17). Basal portion of aedeagus covered with uniformly spaced spinulae (Fig. 17). Apex of aedeagus bulbous, glabrous (Fig. 17).