Stonefly Species Capnia ventura (Little Snowflies)

Source: Larvae Of Five Species Of The Winter Stonefly Genus Capnia (Plecoptera: Capniidae) From California, U. S. A.

(Figs. 12 - 14, 50 - 55, 60, 61)Source: Larvae Of Five Species Of The Winter Stonefly Genus Capnia (Plecoptera: Capniidae) From California, U. S. A.

Characters. Body length male 6.4 - 7.0 mm, female 7.2 - 7.3 mm. Light to medium brown dorsally, ventrum lighter, little pattern except underlying muscles or adult pigment. Antennal segments male 48 - 50, female 48 - 52, head capsule width male 0.75 - 0.81 mm, female 0.78 - 0.90 mm. Lacinia triangular, palmate with longitudinally striate palm surface, broad apical teeth, ventral comb of about 10 bristles and dorsal comb of 16 - 18 longer bristles (Figs. 50, 51). Right mandible with apical teeth, molar pad of dense stiff bristles, and inner band of hairs from base of apical teeth to molar pad (Fig. 52). Left mandible with molar cup bordered by outer (dorsal) comb of curved teeth (Fig. 53). Pronotum with scattered setae over surface and as a marginal fringe (like Fig. 1). Mesosternal Y-arms and shallowly notched hind wing pads typical of genus; inside fore wing pad length male 0.90 - 0.96 mm, female 1.02 - 1.08 mm. Leg setation typical of genus (like Figs. 2, 3). Abdominal segments with long surface and posterior fringe hairs (Fig. 57). Sexual dimorphism evident. Male with posterior extension of 10 th tergum nipple-shaped in dorsal view with underlying developing tubular epiproct visible in pharate individuals (Fig. 12); 10 th tergum in lateral view with emarginated sides, cross-striated basal half, and narrowing apically (Figs. 54, 55). Female without posterior extension of 10 th tergum (Fig. 13). Cercal segments male 30 - 32, female 32; cercomeres with apical circlet of short and long bristles, longer dorsal and ventral bristle in lateral view, and no intercalary hairs (Figs. 60, 61).