Alloperla ouachita Stark & Stewart, 1983

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 : 117

Alloperla ouachita Stark & Stewart

( Figs. 31-36 )

Alloperla ouachita Stark & Stewart in Stark et al., 1983:56.

Holotype ♂ (United States National Museum), Little Missouri River , Montgomery Co., Arkansas

Alloperla ouachita: Surdick, 2004:19 . Redescription

Material examined. AR: Montgomery Co., Little Missouri River , 20 June 1980, J.W. Feminella, 5 ♂ paratypes ( KWS, BPS) .

Epiproct. Length from base to apex, ca. 151 μm. Greatest pre-apical width, ca. 86 μm; apical width, ca. 109 μm. Cowl length exceeding apex of epiproct ( Figs. 31-32, 34 ). Epiproct hairy along rounded dorsomedian keel, but bare along flanged lateral margins ( Figs. 32-33, 35-36 ); ventrolaterally directed setae inconspicuous but present near apex. Lateral margins strongly divergent from basal fusion point with cowl, but narrowed abruptly at base of apical spines. Apex capped with smooth sclerite, clearly offset from body of epiproct by a narrow groove ( Figs. 33-34 ); apex bears a pair of large, laterally directed, curved horns ( Figs. 32-33, 35 ) and, in some specimens, a smaller pair of dorsomedian projections.

Figures

Figs. 31-36. Alloperla ouachita epiproct structures, Little Missouri River, Montgomery Co., AR. 31. Male terminalia, dorsal aspect. 32. Epiproct and cowl, dorsal aspect. 33. Apical half of epiproct, dorsal aspect. 34. Apical half of epiproct, dorsolateral aspect. 35. Epiproct apex, frontal aspect. 36. Detail of basal epiproct surface.