Isoperla mormona Banks, 1920

Sandberg, John B. & Kondratieff, Boris C., 2013, The Isoperla Of California (Plecoptera: Perlodidae); Updated Male Descriptions And Adult Keys For 18 Western Nearctic Species, Illiesia 9 (5), pp. 34-64 : 51

Isoperla mormona Banks

( Figs. 10 a-d)

Isoperla mormona Banks 1920 .

Holotype ♀, Utah, Utah County, Vinyard.

Male. Aedeagus: sclerotized posterior process absent; body a long recurved tube with one small dorsoanterior lobe, tapering to a multi-lobed apex ( Figs. 10 a-b); a thin light dorsoapical band of fine spinulae concentrated somewhat above bi-lobed tip ( Figs. 10 a-b). Mesoposterior area of ninth tergum with bipartite patches of stout dark spinulae and long fine scattered setae, tenth tergum without spinulae ( Fig. 10c ). 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. 10c ). Vesicle: trapezoid shaped, length subequal to width, constricted near base with tapered and straight lateral margins (base wider than apex), apex truncate ( Fig. 10d ).

Isoperla mormona is most similar to I. acula and I. quinquepunctata ( Table 1 ). See comments under I. acula .

Additional Material Examined. CALIFORNIA, Inyo Co., Rawson Creek, 1.1 mi (1.8 km) above Gerkin Rd , ~ 7.5 mi (12.1 km) S Bishop (Hwy 395), 37.28640°N, 118.40420°W, 25/VII/2012, larvae ( ABLC) . San Diego Co., Santa Ysebel Creek, 2 mi (3.2 km) S Dan Price Creek , 29/ V /2011, larvae ( ABLC). OREGON, Harney Co., Trout Creek, NFD 395 Rd 4.25 mi (6.8 km) E Idlewild CG (Hwy 395), 43.80484°N, 118.91082°W, 21/ V /2013, J.B. Sandberg, B.C. Kondratieff, 4 larva; 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, 1♂ ( JBSC).

Figures

Figs. 9-10. Adult male characters of Isoperla miwok, Campbell Cr., Butte Co., CA and I. mormona, Big Chico Cr., Butte Co., CA, 40-50x. Fig. 9a. I. miwok aedeagus, lateral; posteroventral pair and posteroapical spinule patches (arrows). Lobes A: posterior, B: dorsal. Fig. 9b. Aedeagus, ventral; posteroventral pair of spinule patches (black arrow), small pointed apicolateral lobe (white arrow). Fig. 9c. Paraprocts (white arrow); posteroapical spinule patch (black arrow). Fig. 9d. Vesicle. Fig. 10a. I. mormona aedeagus, lateral; paraproct (black arrow); fine dorsoapical spinulae (white arrow). Lobe Adorsoanterior. Fig. 10b. Aedeagus, ventral; paraproct base (arrow). Fig. 10c. Paraprocts (black arrow); fine dorsoapical spinulae (left white arrow); abdominal spinulae (right white arrow). Fig. 10d. Vesicle.