Sapromyza intonsa Loew 1847

Semelbauer, Marek & Kozánek, Milan, 2014, The immatures of lauxaniid flies (Diptera: Lauxaniidae) and their taxonomical implications, Zootaxa 3780 (3), pp. 401-454 : 430-434

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Sapromyza intonsa Loew 1847


Sapromyza intonsa Loew 1847

Living larvae cylindrical, glassy shining. Distal part of Malpighian tubules moderately and irregularly inflated. Egg ( Figs 24–26 View FIGURES 24 – 32 ). Length 0.59–0.68 mm. Ridges sharp and few in numbers. Ribs dense. Apical pole with starlike collar.

First instar ( Figs 131, 132 View FIGURES 131 – 134 ). Length 1.59–2.24 mm. The ventral organ peculiar, retaining the lobe-like appearance, but the large central sensila nested deep within the lobe and surrounded by 6 slender digitiform outgrowths. The lobe of ventral organ expands apically, consequently the second row of scraping cirri is shortened and a relatively large free area left over the mouth hooks. Medial row of scraping cirri developed. Labial lobe with strong spiny hairs on internal surface.

Cephaloskeleton ( Fig. 174 View FIGURES 174 – 176 ). Length 0.17 mm (n= 1). Mouth hooks strong, converging, compact; two teeth at apex; distal part more sclerotised comparing to the basal part. Parastomal bars strong, with longitudinal groove. Epistomal sclerite completely hyaline, almost unrecognisable. Subhypostomal sclerites converging. Ligulate sclerites small and rounded. Ventral bridge narrow. Dorsal bridge semilunar.

Second instar ( Figs 133, 134 View FIGURES 131 – 134 ). Length 2.42–3.58 mm. The labial lobe with inner hairs. 8–10 scraping cirri in the third row. Other features essentially as in the third instar.

Cephaloskeleton ( Fig. 189 View FIGURES 189 – 191 ). Length 0.39 mm (n= 1). Mouth hooks very strong, broad in lateral view, converging, but apices parallel, two unequal teeth at apex. Intermediate sclerite robust, massive ventral bridge. Parastomal bars and the intermediate sclerite interconnected. Epistomal sclerite shorter than broad, arched from dorsal view. Subhypostomal sclerites converging, widened at anterior end; ligulate sclerites tiny. Dorsal bridge semilunar. Dorsal cornua broad in lateral view. Vertical plates narrower than dorsal cornua. Ventral cornua with posterior third hyaline, slightly convex. Cibarium hyaline.

Third instar ( Figs 135–140 View FIGURES 135 – 140 ). Length 3.41–5.16 mm. The facial mask narrow, (up to 12 scraping cirri per row), the scraping cirri in first row with reduced number of apical papillae (3). The stalks of scraping cirri appear to be only slightly laterally flattened and longitudinally corrugated (possibly artefact of preparation for SEM, but it indicates that they are rather rounded on cross-section in living larva). The peristomal cirri monomorphic, stout and few in number. The ventral organ stout with 6 additional digitiform processes. The labial lobe with long internal hairs. The anterior spiracles fan shaped with 6 papillae. The body segments essentially bare; the first thoracic segment with broad belt of comb spines dorsally; the second thoracic segment smooth; the third thoracic segment with narrow band of comb spines dorsally. The processes of anal division barely developed. The sprouts of posterior spiracles basally inflated; the peristigmatic tufts long.

Cephaloskeleton ( Fig. 204 View FIGURES 204 – 206 ). Length 0.54–0.58 mm. Mouth hooks strong, converging, apices subparallel. Intermediate sclerite shorter than mouth hooks. The parastomal bars and the intermediate sclerite fused via dorsal ridge; ventral bridge strong. Epistomal sclerite as a narrow transverse strip, arched in dorsal view; posterior hyaline plate rectangled. Subhypostomal sclerites converging, club-shaped. Ligulate sclerites tiny. Dorsal cornua slightly narrower comparing to the ventral cornua. Ventral cornua hyaline in the posterior third. Cibarium hyaline.