Homoneura limnea (Becker 1895)

Semelbauer, Marek & Kozánek, Milan, 2014, The immatures of lauxaniid flies (Diptera: Lauxaniidae) and their taxonomical implications, Zootaxa 3780 (3), pp. 401-454 : 410-412

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Homoneura limnea (Becker 1895)


Homoneura limnea (Becker 1895)

Living larvae moderately dorsoventrally flattened, the distal parts of Malpighian tubules expanded.

Egg ( Figs 6–8 View FIGURES 1 – 8 ). Length 0.65–0.78 mm. Ridges prominent, not fusing, edge of the ridges can bear irregular denticles. The posterior pole with prominent tubercle. Chorion tuberculous, with fine rectangular net laid over, the transversal septa very dense.

First instar ( Figs 45–48 View FIGURES 45 – 48 ). Length 0.95–1.15 mm. The ventral organ with two simple digitiform projections. The first thoracic segment with broad band of comb spines anterodorsally, second one completely smooth, third one with narrow band of comb spines both dorsally and ventrally. Dorsal creeping welts of the first abdominal segments with comb spines, towards the posterior end successively changing into simple spines. Processes of the anal division slightly indicated.

Cephaloskeleton ( Fig. 164 View FIGURES 162 – 167 ). Length 0.25–0.26 mm. Mouth hooks with 4–5 teeth, stalked part hyaline and widely separated. Labrum with three distinct corners from the dorsal view.

Second instar ( Fig. 49 View FIGURES 49 – 54 ). Length 1.25–3.26 mm. The characters of external morphology similar to previous species.

Cephaloskeleton ( Fig. 179 View FIGURES 177 – 182 ). Length 0.33–0.38 mm. The mouth hooks converging, with 2–3 apical teeth. Ventral bridge narrow. Epistomal sclerite shorter than broad, with posterior hyaline plate. Ligulate sclerites as vertical converging plates. Subhypostomal sclerite as arched bars with anterior swelling. Dorsal bridge longer than broad. Ventral cornua with posterior third hyaline.

Third instar ( Figs 50–58 View FIGURES 49 – 54 View FIGURES 55 – 58 ). Length 3.05–6.12 mm. The facial mask very similar to previous species, as well as the pattern of spinulation on body segments. The anterior spiracles fan-shaped with 7 papillae.

Cephaloskeleton ( Fig. 194 View FIGURES 192 – 197 ). Length 0.65–0.71 mm. The mouth hooks converging. The ventral bridge of intermediate sclerite narrow. The epistomal sclerite shorter than broad with posterior hyaline plate. Ligulate sclerites as converging vertical plates. Subhypostomal sclerite parallel with almost opposite tips. Dorsal bridge longer than broad, anteriorly rounded. The posterior third of ventral cornua hyaline, but the dorsal edge slightly sclerotised.