Sapromyza hyalinata (Meigen 1826)

Living larvae cylindrical, the Malpighian tubules non-expanded.

Egg (Figs 21–22). Length 0.71–0.79 mm. Elongated, carinated, with numerous longitudinal ridges. The chorion very soft, resembling spider’s web, mesh of regular size. Posterior tubercle inconspicuous, anterior pole with asymmetric funnel.

First instar. Length 0.95–1.97 mm. The two digitiform processes of ventral organ with slightly condensed. The second row of scraping cirri shortened medially. The thoracic segments missing comb spines, though the ventral collar of the first thoracic segment present.

Cephaloskeleton (Fig. 173). Length 0.19–0.22 mm. Mouth hooks with 6 teeth. The stalk part of mouth hook thin, distal part almost hyaline, basal part deeply pigmented; dental sclerites well developed.

Second instar. Preparation for SEM microscopy was not successful.

Cephaloskeleton (Fig. 188). Length 0.36–0.39 mm. Mouth hooks converging, broad in lateral view; two apical teeth. The bars of intermediate sclerite with inconspicuous dorsal ridge. Ventral bridge narrow. Epistomal sclerite shorter than broad, arched in dorsal view. Dorsal bridge trapezoid. Posterior third of the ventral cornua hyaline but with sclerotised dorsal margin. Cibarium hyaline.

Third instar (Figs 125–130). Length 2.92–5.05 mm. The third row of scraping cirri begins by the ventral organ. Number of scraping cirri in first three rows 10–12, number of papillae 3–5.

Labial lobe covered by flat folds of the integument with fine marginal hairs. The anterior spiracles fan-shaped, number of papillae varies (8–11). The first thoracic segment covered by comb spines on anterior half. Posterior half covered by extensive flat bumps equipped by hairs on posterior end. The second and third thoracic segments with similar pattern. The dorsal and ventral sides of abdominal segments more or less smooth except of creeping welts. The sides sparsely covered by spines. The anal division sparsely spinous. Processes well developed. Posterior spiracles corrugated.

Cephaloskeleton robust (Fig. 203). Length 0.63–0.68 mm. Mouth hooks converging, as long as the intermediate sclerite. Intermediate sclerite with dorsal ridge. Ventral bridge narrow and prominent in lateral view. Epistomal sclerite narrow and arched in dorsal view. Subhypostomal sclerite stalked, converging. Dorsal bridge rounded or acute, as long as broad. Dorsal cornua broad. Distal third of ventral cornua hyaline, dorsal margin slightly sclerotised, straight. Cibarium hyaline.