Minettia flaviventris (Costa 1844)

Semelbauer, Marek & Kozánek, Milan, 2014, The immatures of lauxaniid flies (Diptera: Lauxaniidae) and their taxonomical implications, Zootaxa 3780 (3), pp. 401-454 : 416

Minettia flaviventris (Costa 1844)

Egg. Preparation for SEM was not successful.

First instar. Length 1.25–1.84 mm. The first row of scraping cirri poorly differentiated. Number of scraping cirri per row very small (8 in the first row). The thoracic segments with broad belts of comb spines anteriorly.

Cephaloskeleton ( Fig. 167 ). Length 0.23–0.24 mm. The basal part of the mouth hooks coalescing into a single plate with two medial perforations, tips ending in two teeth. The parastomal bars very strong.

Second instar. Length 2.48–3.61 mm. Scraping cirri in six rows, 6–7 cirri per row, tips of cirri simple in first rows. The first thoracic segment with wide belt of comb spines dorsally.

Cephaloskeleton ( Fig. 182 ). Length 0.32–0.34 mm. Mouth hooks converging, two apical teeth; dental sclerite unusually large. Epistomal sclerite narrow and arched from dorsal view; posterior hyaline plate rectangular. Subhypostomal sclerites converging, tips converging. Ligulate sclerites arched from ventral view. Rami strong, straight. Parastomal bars strong, connected to the intermediate sclerite via thin sclerotised cuticle. Dorsal bridge trapezoid. Distal part of ventral cornua hyaline, dorsal margin concave. Cibarium hyaline.

Third instar. Length 3.1–5.95 mm. Preparation for SEM was not successful.

Cephaloskeleton ( Fig. 197 ). Length 0.76 mm (n=1). Mouth hooks strongly converging, tips parallel. Intermediate sclerite strong; ventral bridge shallow from lateral view. Epistomal sclerite narrow and arched from dorsal view, posterior hyaline process with two slightly sclerotised corners. Ligulate and subhypostomal sclerites stalked, converging. Dorsal bridge trapezoid, as long as broad. Dorsal cornua as broad as ventral cornua from lateral view, distal third of ventral cornua only slightly sclerotised, concave. Cibarium pigmented, anterior edge with sclerotised band.

Figures

FIGURES 162 – 167. Cephaloskeletons of first larval instar, dorsal (top), lateral (middle) and ventral (bottom) view. 162. Cnemacantha muscaria. 163. Homoneura biumbrata. 164. H. limnea. 165. Minettia austriaca. 166. M. fasciata. 167. M. flaviventris. 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 177 – 182. Cephaloskeletons of second larval instar, dorsal (top), lateral (middle) and ventral (bottom) view. 177. Cnemacantha muscaria. 178. Homoneura biumbrata. 179. H. limnea. 180. Minettia austriaca. 181. M. fasciata. 182. M. flaviventris. a, apodeme of ventral cornu c, cibarium; db, dorsal bridge; dc, dorsal cornua; ds, dental sclerite; 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 192 – 197. Cephaloskeletons of third larval instar, dorsal (top), lateral (middle) and ventral (bottom) view. 192. Cnemacantha muscaria. 193. Homoneura biumbrata. 194. H. limnea. 195. Minettia austriaca. 196. M. fasciata. 197. M. flaviventris. 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.