Stonefly Species Pictetiella expansa (Autumn 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 (1973). Head and pronotum shown in (Fig. 1). Hemitergal lobes (HL) rounded produced inward, apices with long fine hairs, bearing sparse sensilla basiconica anteriorly (Figs. 2, 3). Epiproct cowl densely clothed with short bristle-like setae (Figs. 2, 3) and flanked by inward pointed fingerlike paragenital plates (PP) (Figs. 2, 3). Epiproct sclerotized process bifurcate in lateral aspect (Fig. 2). Sclerotized process singular, widest at base from dorsal aspect (Figs. 3, 4). Fully everted epiproct directed forward. Epiproct long, narrow and widest just before apex (Figs. 3 - 7). Anterior 2/3 of epiproct covered in backward directed shingled scale-like setae, which appear translucent (Fig. 8). Scale-like setae transition into bristle-like setae near apex (Fig. 9). Apex of sclerotized process narrow with flared blunt tip (Figs. 9, 10). Lateral stylets absent. Aedeagus completely membranous, bearing only a few sparse hairs and two small posterolateral lobes (Fig. 11).

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

Pictetiella expansa: Baumann, (1973: 98.) Pictetiella expansa: Baumann et al., (1977: 22., 115.)