Sierracapnia yosemite ( Nelson and Baumann 1987 ), 2015

Bottorff, Richard L. & Baumann, Richard W., 2015, Sierracapnia, A New Genus Of Capniidae (Plecoptera) From Western North America, Illiesia 11 (9), pp. 104-125 : 119-120

Sierracapnia yosemite ( Nelson and Baumann 1987)

( Figs. 34-37 )

Sierracapnia yosemite ( Nelson and Baumann 1987): 491 .

Holotype ♂ ( USNM). Type locality: California, Mariposa Co., Big Creek, Summerdale Campground .

Material Examined. USA, California: Mariposa Co., Big Creek, Hwy 41, Summerdale Campground above Fish Camp , 18-III-1985, R.W. Baumann & C.R. Nelson, 28♂, 11♀ ( USNM, BYUC) ; Chilnualna Creek, above Wawona , 18-III-1985, R.W. Baumann & C.R. Nelson, 1♂, 2♀ ( BYUC) ; creek at south entrance Yosemite National Park , 18-III-1985, R.W. Baumann & C.R. Nelson, 5♂, 3♀ ( BYUC) . Tuolumne Co., Middle Fork Tuolumne River, Evergreen Road , 18-III-1985, R.W. Baumann & C.R. Nelson, 31♂, 6♀ ( BYUC) ; South Fork Tuolumne River, Evergreen Lodge Road , NW Big Oak Entrance, 18-III-1985, R.W. Baumann & C.R. Nelson, 38♂, 37♀ ( BYUC) ; South Fork Tuolumne River, Hwy 120, Smoky Jack Campground , N 37°49’ W 119°43’, 22-VI-2006, R.W. Baumann & B.C. Kondratieff, 1♂ ( BYUC) .

Male. Tergum 7 knob tall, thin, and narrowly divided at apex (knob height 30-35% of segment 7 height; knob width 14-15% of segment 7 width) ( Figs. 34, 37 ). Epiproct in dorsal view with uniform width along length, maximum width 18-24% of epiproct length; maximum width occurs anterior of mid epiproct; apex rounded or wedge-shaped, with a long thin posterior-projecting lobe ( Fig. 35 ); dorsal membrane light colored. Epiproct in lateral view with a shallow reverse (S-shaped) curve dorsally and deep curve ventrally; maximum depth 25-30% of length; maximum depth occurs in anterior third of epiproct; apex elongated and raised, with thin median lip that wraps around tip of eversible crest; neck narrow ( Figs. 34, 36 ). Dorsolateral horns arch high above main epiproct body, exposing membrane of eversible crest in lateral view; horn length 18-21% epiproct length; horn tips extend forward to 85-88% of epiproct length ( Fig. 36 ; Table 1 ).

Female. Subgenital plate heavily sclerotized and dark, plate covers entire width of sternum 8 from its posterior to anterior edge, sclerotization extends onto posterior third of sternum 7 (Fig. 257, Nelson and Baumann 1989).

Distribution. Sierracapnia yosemite inhabits the western slope of central and southern Sierra Nevada near Yosemite National Park in Mariposa and Tuolumne counties, California ( Fig. 39 ).

Figures

Figs. 34-37. Sierracapnia yosemite. Male: Tuolumne River, California: 34. Genitalia, lateral, epiproct, knob on tergum 7 and knobs on tergum 9. 35. Genitalia, dorsal, epiproct and knobs on tergum 9. 36. Epiproct, lateral, apex. 37. Knob on tergum 7, anterior.

Fig. 39. Distributional map of Sierracapnia spp.: barberi (red), hornigi (purple), mono (dark green), palomar (light blue), washoe (yellow), and yosemite (dark blue).