Sapromyzosoma quadripunctata (Linnaeus 1758)

The mature larvae relatively large, soft and dorsoventrally flattened, welts and crevices well developed. The Malpighian tubules slightly and irregularly inflated.

Egg. Length 0.67– 0.19 mm. The ridges and ribs well developed, sharp-edged, ribs creating small regular rectangles. Posterior pole with conspicuous tubercle with few openings. Small eggs with ribs only indicated, ridges simple, seldom fusing, the surface tuberculous.

First instar (Figs 156, 157). Length 1.21–1.45 mm. The facial mask broad, number of scraping cirri per row large (up to 60). The peristomal cirri filiform, aligned in a diagonal row. The labial lobe small (shorter than long). The ventral organ with small basal lobe and two digitiform processes.

Cephaloskeleton. Length 0.25–0.26 mm, very similar to the previous species.

Second instar (Figs 158–161). Length 2.12–2.85 mm. Facial mask broad, with numerous cirri. First thoracic segment smooth; second one with narrow string of comb spines anterodorsally; third one with broad band of comb spines and hairs. Abdominal segments and anal division dorsally covered by robust spines, laterally by hairs and ventrally by spines on creeping welts.

Cephaloskeleton. Length 0.49–0.51 mm. Very similar to previous species. Potential differences include the shape of subhypostomal sclerites.

Third instar was not obtained.