Stonefly Species Calileuctra ephemera (Tiny Winter Blacks)

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

(Figs. 1 - 6, 7 - 12, 13 - 18, 19 - 20, 33)Source: Larvae Of The Two North American Species Of Calileuctra (Plecoptera: Leuctridae)

Characters of mature larvae. Color, pigmentation (Fig. 1), lacinia (Figs. 7, 8), general body, leg, and cercal setation (Fig. 1,) and mouthparts, typical of genus. Body length male 5 - 6.5 mm, female 6 - 8 mm. Head capsule width male 0.66 - 0.75 mm, female 0.75 - 0.84 mm. Antennal segments 60 - 64, each with very short apical circlet of hairs or sensillae. Lacinia triangular and palmate, with 2 rounded-tipped apical teeth, 8 - 10 dorsal and ventral rows of long, sharp spines, a long, trichoid sensilum arising from the base of one apical tooth (and as long as the tooth) (Fig. 9), and a scalloped palm surface. Right mandibular molar cup, in side view, with 8 - 10 stalked teeth that are manifested in both Calileuctra species as stalked ridges extending onto the cup (see inside surface of Calileuctra dobryi cup, Fig. 27). Left mandibular molar cup with about 12 long, curved, comb-like outer sharp teeth, and 3 or 4 raised transverse ridges (that in Fig. 13 are probably well worn). Mesosternum with a double stem of its Y-ridge (Fig. 2). Inside fore wing pad length male 0.66 - 0.75 mm, female 0.72 - 0.96 mm; inside hind wing pad length male 0.51 - 0.63 mm, female 0.60 - 0.78 mm. Foreleg femoral and tibial surface with sparse, short, stiff hairs, fine appressed clothing hairs, and few if any fringe hairs (Figs. 1, 14); apex of tibia with 2 heavy apical spines; tarsal segments 1, 2, with double ventral rows of short spines (Fig. 15). Abdominal terga with scattered, appressed clothing hairs, and segments 7 - 10 with thick, bristle-like setae, especially laterally, in dorsal view (Figs. 16 - 18); terga 7 - 8 (Fig. 17) without 2 diverging rows of short, thick sensillae (as present in Calileuctra dobryi, see Figs. 30, 31). Developing male genitalia evident dorsally and ventrally just prior to emergence (Figs. 3, 4). Cercal segments 20 - 24 (Fig. 6), each, except terminal few, with apical circlet of more than 15 stiff hairs (Fig. 20); hairs of basal segments only about half the length of following segment (Fig. 19).