Stonefly Species Allocapnia rickeri (Little Snowflies)

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

Male epiproct. Epiproct upper limb long, somewhat spear-shaped in dorsal aspect, with no basal angulation (Fig. 32), and the tip bears a small, swollen section covered with short ridges and a short mesal groove (Figs. 33 - 34). Posterior to grooved apical section, a long, low, median ridge extends for most of upper limb length (Fig. 32), and a broad, shallow, median trough extends forward from base. In lateral aspect, short apical section reflexed slightly downward (Fig. 33) and some ridges have obscure undulations similar to those of Allocapnia aurora (Fig. 35). Male tergal process. The tergal process rises from the 8 th abdominal segment as two knobs covered with scale-like tubercles; knobs widely separated by notch which extends completely to base of process (Fig. 36). In lateral aspect, anterior margin of process projects somewhat higher than posterior margin.

Female subgenital plate. Abdominal sterna 7 and 8 joined by bridge sclerite but bridge narrowly notched on mid-lateral margins by membrane (Figs. 37, 63). Apex of subgenital plate truncate and scarcely projecting beyond lateral margins of sternum 8.

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. 226 µm long, and armed on the apical ca. 173 µm with dense patch of wave-like spikes (Figs. 97 - 101); apical segment ca. 132 µm wide at base and gradually narrowed to bluntly rounded tip. Basal segment of upper limb ca. 350 µm long and ca. 111 µm wide near mid-length; basal segment bears a wide, shallow, longitudinal groove which extends to base of apical segment. Lower limb hidden beneath apical segment of upper limb. Male tergal process. Prominent raised structures on abdominal tergum 8 (Figs. 100 - 102). Process of tergum 8 bilobed, ca. 175 µm wide, and the lobes separated by a ca. 85 µm notch. Lobes deeply divided and covered with scale-like structures.