Stonefly Species Arsapnia decepta (Little Snowflies)

Source: Variation In The Epiproct Of Arsapnia Decepta Banks, 1897 (Plecoptera: Capniidae), With Comments On Arsapnia Coyote (Nelson & Baumann 1987)

Male epiproct (n = 2). Length not estimated due to specimen condition and orientation (Figs. 61, 64; Table 5). Width 238 µm. Shape and general features similar to other specimens examined. Setal spines in clusters of 13 - 18 (Table 5, Figs. 61 - 66). Neck width 93 µm (Fig. 64).

Tergal process (n = 3). Tergum 7 bears a broad, sometimes mesally notched, dorsal process 185 µm in width (Figs. 13, 19, 22, 27); dorsal margin concave; and tergum 6 bears a smaller mesal process. Dorsolateral margins bearing a few knob-like scales. Width across anterior margin 172 - 229 µm. ; lateral margins converging only slightly from anterior aspect; process bears lateral patches of small scale-like structures. Width of process across anterior margin 172 - 231 µm; width greater than median height. Bearing a slight notch on the posteromedian margin (Fig. 49 - 52, 57 - 58), and with lateral margins moderately convergent. Dorsolateral lobes on either side of notch covered with conical tubercles. Width of process across anterior margin 100 - 192 µm.