Stonefly Species Calileuctra dobryi (Tiny Winter Blacks)

Source: Larvae Of The Two North American Species Of Calileuctra (Plecoptera: Leuctridae)

(Figs. 21 - 24, 25 - 30, 31 - 32, 34)Source: Larvae Of The Two North American Species Of Calileuctra (Plecoptera: Leuctridae)

Characters of mature larvae. Color, pigmentation, general body and cercal setation (Fig. 21), and mouthparts typical of genus. Body length 7 - 8 mm. Head capsule width (1 female larva) 0.75 mm. Antennal segments 60 - 64, each with very short apical circlet of hairs or sensillae. Lacinia triangulate and palmate, with 2 rounded-tipped apical teeth, 8 - 10 dorsal and ventral rows of long, sharp spines (Fig. 25), and a scalloped palm surface. Right mandibular molar cup outer margin, in side view, appears as a row of blunt-tipped, stalked teeth (Fig. 26) that are actually the outer edges of 10 - 12 stalked ridges extending well onto the inner cup surface (Fig. 27). Left mandible molar cup with comb-like outer teeth (Fig. 28; cup of the 1 larva sacrificed for SEM was well worn, in poor condition). Mesosternum with a double stem of its Y-ridge. Foreleg femoral and tibial surface with sparse hairs and with variable number of fine fringe hairs; apex of tibia with 2 heavy apical spines (Fig. 22). Tarsal segments 1, 2 with double ventral row of short thick setae. Abdominal terga with long, fine appressed surface clothing hairs; terga 7 - 9 without thick setae (Fig. 29), especially laterally, as are present in < id="1531" italics="1" active="1" />Calileuctra ephemera (Figs. 16 - 18). Terga 7 - 8 with 2 diverging basal, sublateral rows of short, thick sensillae (Figs. 30 - 31), not present in < id="1531" italics="1" active="1" />Calileuctra ephemera. Cercal segments 20 - 22, each with apical circlet of more than 15 stiff hairs, except few apical and preapical cercomeres (Fig. 16); basal segments with some hairs longer than the following segment (Fig. 32).