Sapromyza sexpunctata Meigen 1826

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

Sapromyza sexpunctata Meigen 1826

The mature larvae soft and dorsoventrally flattened with marked welts and crevices. The Malpighian tubules slightly and irregularly inflated.

Egg ( Figs 27–29 ). Length 0.69–0.75 mm. Ridges clearly developed and sharp, in the dorsal side ridges pronounced with indicated transversal septa. In the ventral side the ridges suppressed, near the apical pole with hexagonal structure, towards the posterior pole the ridges become more apparent.

First instar ( Fig. 141 ). Length 0.58–0.97 mm. The scraping cirri elongated and numerous (> 25 in a single row).

Cephaloskeleton ( Fig. 175 ). Length 0.21 mm (n=1). The mouth hooks with 10 apical teeth; stalked part hyaline, slender.

Second instar ( Figs 142–144 ). Length 2.16–3.58 mm. The scraping cirri elongated and 23–26 per row. The posterior rows of peristomal cirri very slender, almost filamentous. The first and second thoracic segment smooth, the third one sparsely spinous. The abdominal segments densely spinous. The ambulatory lobes slender.

Cephaloskeleton ( Fig. 190 ). Length 0.45–0.49 mm. Very similar to P. vittata . Major difference represents only the shape of subhypostomal sclerites.

Third instar ( Fig. 145 ). Length 3.11–4.04 mm. The scraping cirri up to 40 per row. The first and second thoracic segments smooth. The abdominal segments spinous.

Cephaloskeleton ( Fig. 205 ). Length 0.77–0.81 mm. Mouth hooks slender, slightly converging; distal part relatively strong and hook-shaped. Intermediates sclerite slender. Epistomal sclerite trapezoid, anterior margin concave. Subhypostomal sclerites peculiar. Rami and parastomal bars very slender. Dorsal bridge approximately as long as broad. Dorsal cornua slender, almost as long as ventral ones. Ventral cornua very broad, mildly sclerotised. Cibarium slightly pigmented.

Figures

FIGURES 24 – 32. Eggs of Sapromyza intonsa, S. sexpunctata and Sapromyzosoma quadricincta. 24. S. intonsa, lateral view. 25. Same, detail of posterior tubercle. 26. Same, detail of the egg chorion. 27. S. sexpunctata, lateral view. 28. Same, detail of the posterior tubercle. 29. Same, detail of the apical end of the egg, ventral view. 30. S. quadricincta, dorsal view. 31. Same, detail of the posterior tubercle. 32. Same, detail of the egg chorion.

FIGURES 141 – 145. Sapromyza sexpunctata, all instars. 141. Cephalic segment of the first instar, latero-ventral view. 142. Cephalic segment of the second instar, latero-ventral view. 143. Thoracic segments of the second instar, dorsal view. 144. Abdominal segments and the anal division of the second instar, dorsal view. 145. Cephalic segment of the third instar, lateroventral view. A, antenna; A 4 – A 7, fifths to seventh abdominal segments; AD, anal division; Al, ambulatory lobes; CS, cephalic segment; DP, dorsal process; LL, labial lobe; LP, lateral process; MH, mouth hook; MP, maxillary palpus; PC, peristomal cirri; PS, posterior spiracles; SC, scraping cirri; SC 1, first row of scraping cirri; T 1 – T 3, first to third thoracic segments; VO, ventral organ.

FIGURES 174 – 176. Cephaloskeletons of first larval instar, dorsal (top), lateral (middle) and ventral (bottom) view. 174. Sapromyza intonsa. 175. S. sexpunctata. 176. Sapromyzosoma quadricincta. c, cibarium; db, dorsal bridge; dc, dorsal cornua; dmh, distal part of mouth hook; es, epistomal sclerite; is, intermediate sclerite; lb, labrum; ls, ligulate sclerite; smh, stalked part of mouth hook; pb, parastomal bar; ss, subhypostomal sclerite; vb, ventral bridge; vc, ventral cornua; vp, vertical plate.

FIGURES 189 – 191. Cephaloskeletons of second larval instar, dorsal (top), lateral (middle) and ventral (bottom) view. 189. Sapromyza intonsa. 190. S. sexpunctata. 191. Sapromyzosoma quadricincta. a, apodeme of ventral cornu; c, cibarium; db, dorsal bridge; dc, dorsal cornua; es, epistomal sclerite; is, intermediate sclerite; lb, labrum; ls, ligulate sclerite; mh, mouth hook; pb, parastomal bar; r, rami; ss, subhypostomal sclerite; vb, ventral bridge; vc, ventral cornua; vp, vertical plate.

FIGURES 204 – 206. Cephaloskeletons of third larval instar, dorsal (top), lateral (middle) and ventral (bottom) view. 204. Sapromyza intonsa. 205. S. sexpunctata. 206. Sapromyzosoma quadricincta. a, apodeme of ventral cornu; apoc, cibarium; db, dorsal bridge; dc, dorsal cornua; es, epistomal sclerite; is, intermediate sclerite; lb, labrum; ls, ligulate sclerite; mh, mouth hook; pb, parastomal bar; r, rami; ss, subhypostomal sclerite; vb, ventral bridge; vc, ventral cornua; vp, vertical plate.