Stonefly Species Sweltsa onkos (Sallflies)

Source: Larvae Of Eight Eastern North American Sweltsa (Plecoptera: Chloroperlidae)

Mature larva. Body length 7.5 - 8.5 mm. General color brown, abdomen chestnut brown; body without distinctive pattern except underlying adult features in pharate individuals. Thorax and abdomen covered with abundant dark clothing hairs. Pronotum bearing ca. 20 anterolateral setae, and ca. 19 posterolateral setae; both rows extend to near median suture (Fig. 21). Mesonotum bearing ca. 13 outer marginal setae and a few inner marginal setae (Fig. 22). Foreleg with sparse femoral and more extensive tibial fringe setae; femora with ca. 5 long thick setae on dorsal margin and ca. 9 on ventral margin (Fig. 23); tibiae bearing 3 - 4 long thin outer marginal setae and ca. 5 inner marginal thick setae. Abdominal tergum 8 with posterior fringe complete; mesally fringe includes mixed thin and thick setae (Fig. 24); lateral intercalary setal cluster includes ca. 14 thick setae. Cerci with ca. 14 - 15 segments; long dorsal setae in apical segmental whorls about as long as two segments (Fig. 25).