Stonefly Species Allocapnia aurora (Little Snowflies)

Source: The Winter Stoneflies (Plecoptera: Capniidae) Of Mississippi

Male epiproct. Epiproct long, slender, and spear shaped in dorsal aspect (Fig. 4), armed in the apical fourth with smooth, undulant ridges (Figs. 4 - 6), but smooth in basal three-quarters. A prominent, narrow, longitudinal groove divides most of the apical half in dorsal aspect, and a broad, shallow trough is present on the basal third. In lateral aspect, apex slightly inflated to a terminal acute tip; lower limb apex not visible in dorsal aspect but in lateral aspect it bends sharply ventrad near dorsal limb tip (Fig. 5), and lower limb slightly wider in dorsal aspect than upper limb from base to beyond mid-length (Fig. 4). Male tergal process. Tergum 8 bears a single process with moderately deep notch (Figs. 5, 7), narrow and upright in lateral aspect (Fig. 8); notch slightly wider than tall, oval knobs at each end of process; knobs covered over most of surface with scale-like tubercles (Figs. 7 - 8).

Female subgenital plate. The truncate hind margin of sternum 8 does not project beyond lateral margins of segment and mesal sclerite on sternum 8 completely fused with mesal sclerite on sternum 7; fusion point between segments 7 - 8 marked by dark transverse line (Fig. 59) formed from infolding of bridge sclerite beneath segment 7 (Fig. 9).

Source: Epiproct And Dorsal Process Structure In The Allocapnia Forbesi Frison, Allocapnia Pygmaea (Burmeister), And Allocapnia Rickeri Frison Species Groups (Plecoptera: Capniidae), And Inclusion Of Allocapnia Minima (Newport) In A New Species Group

Male epiproct. Apical segment of upper limb ca. 334 - 370 µm long, armed over apical ca. 175 - 200 µm with dense patch of wave-like spikes (Figs. 43 - 45); apical segment ca. 131 - 134 µm wide at base, tapered to a narrow rounded tip. Basal segment of upper limb ca. 340 - 380 µm long and ca. 75 - 88 µm wide at mid-length; basal segment with a broad, shallow groove extending from base to base of apical segment. Lower limb ca. 181 - 187 µm wide at point of greatest width, and bearing a sparse, irregular, setal row along apical third of lateral margins. Male tergal process. Prominent raised structure on abdominal tergum 8 (Figs. 46 - 48). Bilobed process ca. 213 - 230 µm wide, bearing a U-shaped notch ca. 84 µm wide. Lobes of process and posterior face of notch bearing scale-like surface structures; anterior face of process bearing a deep transverse groove (Fig. 47). In lateral aspect, lobes extend vertically at an approximate 90 ° angle from swollen base (Fig. 46).

Source: New Records Of Winter Stoneflies (Plecoptera: Capniidae) In Mississippi