Alloperla furcula Surdick, 2004

Willett, Michele R. & Stark, Bill P., 2009, The Alloperla Leonarda Group Of Eastern North America, With Sem Images Of Four Out-Group Species (Plecoptera: Chloroperlidae), Illiesia 5 (11), pp. 108-127 : 109

Alloperla furcula Surdick

( Figs. 1-6 )

Alloperla furcula Surdick, 1981:349 .

Holotype ♂ (United States National Museum), Upper Three Runs Creek , Aiken Co., South Carolina

Alloperla furcula: Surdick, 2004:15 . Redescription

Material examined. SC: Aiken Co., Upper Three Runs Creek , Savannah River Plant , 1 April 1977, Herlong , Prichard, 5 ♂ ( BPS) . Same location, 4 May 1977, Herlong, Prichard, 10 ♂, 4 ♀ ( BPS) . Aiken Co., Tinker Creek , Savannah River Plant , 1 June 1977, Herlong , Prichard, 1 ♂, 6 ♀ ( BPS) .

Epiproct. Length from base to fork, ca. 146 μm. Greatest pre-apical width, ca. 27 μm; apical width, ca. 53 μm. Cowl reaching well beyond apical third of epiproct tip ( Figs. 1-2 ). Dorsum of epiproct bare in apical third but basal two thirds bearing a sparse covering of appressed setae and a few long setae with freely curled tips ( Figs. 2-3, 6 ); subapical area of epiproct bearing lateral rows of long, ventrolaterally directed setae ( Figs. 3-5 ). Dorsal aspect of epiproct becoming slightly wider from basal fusion with cowl to abrupt subapical narrowing. Strong laterally directed arms of apical fork present a “fish tail” appearance ( Figs. 2-3 ).

Figures

Figs. 1-6. Alloperla furcula epiproct structures, Upper 3-Runs Creek, Aiken Co., SC. 1. Male terminalia, dorsal aspect. 2. Epiproct and cowl, dorsal aspect. 3. Apical half of epiproct, dorsal aspect. 4. Epiproct apex, dorsolateral aspect. 5. Epiproct apex, frontal aspect. 6. Detail of basal epiproct surface.