Stonefly Species Paraperla frontalis (Sallflies)

Source: Larval And Egg Morphology Of Paraperla Frontalis (Banks, 1902) And Paraperla Wilsoni Ricker, 1965 (Plecoptera: Chloroperlidae)

Egg. Outline oval (Fig. 1). Length ca. 305µm, equatorial width ca. 227 µm. Collar sessile, surrounded by a smooth circular zone ca. 43 µm wide forming a circular plaque-like structure with diameter of ca. 107 µm (Figs. 2, 3). Chorion covered throughout (except smooth collar zone) with irregularly sized pits; larger pits, ca. 6.5 µm in diameter, give a coarse aspect to chorionic surface. Micropylar row equatorial, orifices without rims (Fig. 4).

Larva. Body length pre-emergent specimens 15 - 17 mm. General color pale brown without distinctive pigment pattern. Body covered with thin clothing hairs and short, thick setae, usually restricted to posterior segmental fringes and lateral clusters. Posterior fringes of abdominal sterna interrupted mesally except on sternum 10. Lacinia with two teeth, 2 nd much smaller than 1 st; and not reaching mid length of larger tooth (Figs. 7 - 8); a prominent row of ca. 30 spine-like pecten comprise a comb-like structure extending from base of 1 st lacinial tooth, along midline of tooth to beyond base of 2 nd tooth (Figs. 9 - 10). Basal cercal segments with terminal whorl of setae, but mid and apical segments bear a dense vertical fringe of long, fine swimming hairs (Figs. 13 - 15).