Stonefly Species Sweltsa mediana (Sallflies)

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

Mature larva. Body length 7.0 - 8.0 mm. General color pale brown without distinctive pigment pattern except underlying adult pattern in pharate individuals. Pronotum bearing ca. 14 anterolateral setae and ca. 16 posterolateral setae near margin; posterolateral setal row extends to median suture (Fig. 11). Mesonotum bearing prominent setae scattered along outer margin from base to apex (Fig. 12), and a few inner marginal setae near notch. Metanotum with several outer marginal setae and a large grouping of intercalary setae on wing pad surface; apex of wing pads with interspersed long and short setae. Fore femora with a few fringe setae, tibiae sparsely fringed on outer surface (Fig. 13). Thick setae present on dorsal and ventral margins and a few scattered on femoral surface; tibiae bearing long thin setae and a row of short thick setae along outer margin. Posterior abdominal fringe on tergum 8 with a mixture of thin and thick setae between innermost long setae (Fig. 14); intercalary setae clustered in lateral group of ca. 7. Cerci with ca. 15 segments; long dorsal setae in segmental whorls about as long as 1.5 segments (Fig. 15).