Isoperla quinquepunctata (Banks)

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 : 53

Isoperla quinquepunctata (Banks)

( Figs. 12 a-d)

Chloroperla 5-punctata Banks 1902.

Holotype ♀, New Mexico, Las Vegas, Gallinas River .

Isoperla patricia Frison 1942 .

Holotype ♂, South Dakota, Lawrence County, Spearfish River, Spearfish .

Male. Aedeagus: sclerotized posterior process absent; body of aedeagus with a small posteromedian lobe covered with minute spinulae, one posteroapical lobe, one dorsal lobe, and an anterior lobe ( Fig. 12a ). Posterolateral margin of ninth and tenth terga with patches of long stout setae, fewer and smaller on tergum ten ( Fig. 12c ). 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 gradually to blunt apices ( Fig. 12c ). Vesicle: rounded lobe, widest at base with broadly rounded apical margin ( Fig. 12d ), sometimes appears constricted along inner sclerotized lateral margins with wider and broadly rounded membranous outer lateral margins.

The live everted aedeagus agrees generally with the previous description ( Szczytko & Stewart 1979, fig. 36). In this study, the small lobe A is covered with minute spinulae ( Fig. 12a ) vs. devoid of spinulae ( Szczytko & Stewart 1979, fig. 36 D), and a truncated dorsal lobe C is present ( Fig. 12a ) vs. absent in Szczytko & Stewart (1979, fig. 36).

Isoperla quinquepunctata , a geographically widespread western Nearctic species ( Szczytko & Stewart 1979) is most similar to I. acula and I. mormona ( Table 1 ). See comments under I. acula .

Additional Material Examined. OREGON, Grant Co., Silvies River , Hwy 395, 0.6 mi (0.9 km) S Seneca , 44.12529°N, 118.97443°W, 21/ V /2013, J.B. Sandberg, B.C. Kondratieff, 6♂, 3♀ ( JBSC); Harney Co., Trout Creek, Whitehorse Ranch Rd 18 mi (28.9 km) SE Fields , 42.17439°N, 118.43199°W, 21/ V /2013, J.B. Sandberg, B.C. Kondratieff, larvae ( JBSC); Klamath Co., Sprague River, Hwy 140 unnamed access 4.74 mi (7.6 km) E Beatty , 42.44096°N, 121.18719°W, 19- 20/ V /2013, J.B. Sandberg, B.C. Kondratieff, 2♀ ( JBSC); Lake Co., Crooked Creek, Hwy 395 at Chandler State Park 17 mi (27.3 km) N Lakeview, 42.41125°N, 120.29129°W, 20/ V /2013, J.B. Sandberg, B.C. Kondratieff, 4♂, 3♀ ( JBSC).

Figures

Figs. 11-12. Adult male characters of Isoperla pinta, Butte Cr., Butte Co., CA and I. quinquepunctata, Yuba R., Yuba Co., CA & Nehalem R., Clatsop Co., OR, 32-50x. Fig. 11a. I. pinta aedeagus, lateral. Lobes A: posterobasal, B: posteroapical lobe, C: anterolateral pair. Fig. 11b. Aedeagus, ventral. Fig. 11c. Paraprocts (arrow). Fig.11d. Vesicle; prothoracic pigment pattern (inset-dorsal view). Fig. 12a. I. quinquepunctata aedeagus, lateral. Lobes A: posterobasal, B: posteroapical, C: dorsal, D: anterior. Fig. 12b. Aedeagus, ventral. Fig. 12c. Paraprocts (black arrow); abdominal spinules (white arrows). Fig. 12d. Vesicle.