Stonefly Species Allocapnia pygmaea (Little Snowflies)

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. 340 - 400 µm long, armed on apical ca. 176 - 220 µm with dense patch of wave-like spikes (Figs. 67 - 69); apical segment ca. 125 - 135 µm wide at base, tapered to a narrow, rounded tip. Basal segment of upper limb ca. 303 - 309 µm long and ca. 79 - 103 µm wide at mid-length; basal segment with median groove narrowed toward base of apical segment (Fig. 67). Greatest width of lower limb ca. 148 - 194 µm; lower limb bearing a sparse, marginal row of long setae in apical third (Fig. 69). Male tergal process. Prominent raised structure on abdominal tergum 8 (Figs. 70 - 72). Bilobed process on tergum 8 ca. 162 - 174 µm wide and bearing a deep U-shaped mesal notch; notch width ca. 44 - 56 µm. Lobes of process diverge in dorsal aspect, but appear straight and slightly swollen in lateral aspect; lobes covered with scale-like structures; anterior face bearing a shallow, transverse groove.