Poecilolycia vittata (Walker 1849)

Semelbauer, Marek & Kozánek, Milan, 2014, The immatures of lauxaniid flies (Diptera: Lauxaniidae) and their taxonomical implications, Zootaxa 3780 (3), pp. 401-454 : 421-425

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Poecilolycia vittata (Walker 1849)


Poecilolycia vittata (Walker 1849)

Living larvae translucent, dorsoventrally flattened and with marked welts and crevices. The Malpighian tubules moderately expanded and form a typical ventral loop; in the first instar filled with white matter, in the second and third instars the loop filled with light-orange matter, remaining parts of the tubules filled with white matter; more intensive colours are typical for the older larvae.

Egg ( Figs 15–17 View FIGURES 15 – 23 ). Length 0.65–0.69 mm. Chorion with dense and marked ridges. Dorsal side of egg with elongated spines on the ridges, ventral side without spines, but edge of the ridges undulated.

First instar ( Figs 93, 94 View FIGURES 93 – 98 ). Length 1.08–2.23 mm. Number of scraping cirri per row large (<40), before the first row is one more row of small cirri. The peristomal cirri filamentous, arranged almost in horizontal row. The ventral organ essentially lobate, peculiar. The ambulatory lobes slender, appear two-segmented. The sprouts of posterior spiracles swelled; peristigmatic tufts long.

Cephaloskeleton ( Fig. 170 View FIGURES 168 – 173 ). Length 0.27–0.28 mm. Mouth hooks with 10–12 teeth, stalked part hyaline and slender. Intermediate sclerite and parastomal bars almost equal in diameter; ventral bridge broad and strongly arched in ventral view. The epistomal sclerite convex, longer than broad, with apical tooth. Subhypostomal sclerites opposite.

Second instar ( Figs 95–98 View FIGURES 93 – 98 ). Length 2.02–4.11 mm. Facial mask broad, up to 30 of scraping cirri per row. The peristomal cirri differentiated in two types: filamentous and flat triangular. The body segments covered by stout spines; the first thoracic segment smooth; the processes of anal division stout, ambulatory lobes slender, twosegmented.

Cephaloskeleton ( Fig. 185 View FIGURES 183 – 188 ). Length 0.46–0.49 mm. Mouth hooks week, basal third converging, otherwise parallel, 5 apical teeth. The epistomal sclerite rounded. The intermediate sclerite slender; ventral bridge broad and descending posteriad. Subhypostomal sclerites as horizontal perforated plates. Ligulate sclerites as vertical converging plates. Dorsal bridge narrow, equally broad along whole length. Dorsal cornua week, shorter than ventral ones. Posterior half of ventral cornua hyaline with sclerotised and convex dorsal margin. Basal part of dorsal and ventral cornua and vertical plates finely striolated. Cibarium slightly pigmented, inter-ridge distances large.

Third instar ( Figs 99–104 View FIGURES 99 – 104 ). Length 3.13–6.19 mm. The facial mask very similar to previous instar, up to 40 scraping cirri per row. Labial lobe very short, trilobite. The anterior spiracles fan-shaped, with 9 papillae, one apparently fused from several papillae. The first thoracic segment smooth, the second one sparsely covered by spines dorsally; rest body segments covered by stout spines. The anal division as in previous instar.

Cephaloskeleton ( Fig. 200 View FIGURES 198 – 203 ). Length 0.81–0.82 mm. Mouth hooks weak, straight and slightly converging. The epistomal sclerite rounded and convex. Remaining features largely as in the second instar, but the ventral cornua almost completely slightly sclerotised.