Minettia plumicornis Fallén 1820

Semelbauer, Marek & Kozánek, Milan, 2014, The immatures of lauxaniid flies (Diptera: Lauxaniidae) and their taxonomical implications, Zootaxa 3780 (3), pp. 401-454 : 421

Minettia plumicornis Fallén 1820

Living larvae moderately dorsoventrally flattened, distal parts of Malpighian tubules inflated, with typical ventral loop.

Egg ( Figs 13, 14 ). Length 0.61–0.78 mm. Robust, with number of ridges, ribs slightly indicated. Posterior tubercle prominent with marked perforations.

First instar ( Figs 77, 78 ). Length 1.18–1.76 mm. Facial mask narrow (eight scraping cirri per row); peristomal cirri very few and robust, almost spine-like.

Cephaloskeleton ( Fig. 169 ) robustly build. Length 0.23–0.27 mm. Mouth hooks with only two apical teeth, basal part sclerotised, dental sclerite absent. Parastomal bars strong. Subhypostomal sclerites converging.

Second instar ( Figs 79, 80 ). Length 1.78–2.79 mm. The facial mask narrow, 11–12 scraping cirri per row, scraping cirri in first rows with simple tips; peristomal cirri robust. Labial lobe with smooth internal surface. The thoracic segments with dense rows of comb spines anteriorly. The body segments beginning with the second thoracic laterally covered by small bumps, the last body segments covered by bumps even dorsally. The posterior spiracles robust with small and simple peristigmatic tufts.

Cephaloskeleton was not acquired. Mouth hooks with two apical teeth.

Third instar ( Figs 81–86 ). Length 2.99–5.16 mm. The external features conform to that of the second instar.

Cephaloskeleton ( Fig. 198 ) robustly build. Length 0.51–0.54 mm. The mouth hooks converging, as large as the intermediate sclerite. The epistomal sclerite as narrow transversal and arched strip; posterior hyaline process with two sclerotised corners. The subhypostomal sclerites converging. The intermediate sclerite and the parastomal bars interconnected via strip of cuticle. The dorsal cornua broad. The ventral cornua posteriorly hyaline.

Figures

FIGURES 9 – 14. Eggs of species of Minettia. 9. M. austriaca, lateral view. 10. Same, detail of the posterior tubercle. 11. M. loewi, dorsal view. 12. Same, detail of the posterior tubercle. 13. M. plumicornis, lateral view. 14. Same, detail of the posterior tubercle.

FIGURES 77 – 80. Minettia plumicornis, first (77, 78) and second (79, 80) instars. 77. Cephalic segment, ventral view. 78. Cephalic segment, dorso-lateral view. 79. Cephalic segment, ventral view. 80. Detail of the ventral organ. A, antenna; LL, labial lobe; MH, mouth hook; MP, maxillary palpus; PC, peristomal cirri; SC, scraping cirri; SC 1, first row of scraping cirri; VO, ventral organ.

FIGURES 168 – 173. Cephaloskeletons of first larval instar, dorsal (top), lateral (middle) and ventral (bottom) view. 168. Minettia loewi. 169. M. plumicornis. 170. Poecilolycia vittata. 171. Pseudolyciella pallidiventris. 172. Sapromyza apicalis. 173. S. hyalinata. 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 81 – 86. Minettia plumicornis, third instar. 81. Cephalic segment, ventral view. 82. Detail of the ventral organ. 83. Thoracic segments, dorsal view. 84. Anterior spiracle, lateral view. 85. Last abdominal segments and the anal division, dorsal view. 86. Last abdominal segments and the anal division, ventral view. A, antenna; A 6 – A 7, sixth to seventh abdominal segments; AD, anal division; AL, ambulatory lobe; 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 198 – 203. Cephaloskeletons of third larval instar, dorsal (top), lateral (middle) and ventral (bottom) view. 198. Minettia plumicornis. 199. P. litura. 200. Poecilolycia vittata. 201. Pseudolyciella pallidiventris. 202. Sapromyza apicalis. 203. S. hyalinata. 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.