Stonefly Species Paraperla wilsoni (Sallflies)

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

(Figs. 5 - 6, 11 - 12, 16 - 18)Source: Larval And Egg Morphology Of Paraperla Frontalis (Banks, 1902) And Paraperla Wilsoni Ricker, 1965 (Plecoptera: Chloroperlidae)

Egg. Outline oval. Length ca. 331 µm, equatorial width ca. 241 µm. Collar sessile, surrounded by a smooth circular zone ca. 37 µm wide forming a circular plaque-like structure with diameter of ca. 97 µm (Figs. 5 - 6). Chorion covered throughout (except smooth collar zone) with shallow, obscure, irregularly sized pits, ca. 2.5 µm in diameter. Micropylar row equatorial.

Larva. Body length pre-emergent specimens 14 - 16 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. 11 - 12); lacinial pecten row absent. Basal, mid and apical cercal segments bear terminal whorls of setae (Figs. 16 - 18); apical setal whorls composed of longer setae but vertical setal fringe absent. Legs with femoral and tibial swimming fringes absent or sparse.