Morphology of preimaginal stages of Lauxania and Calliopum (Diptera: Lauxaniidae) Author Semelbauer, Marek Author Kozánek, Milan text Zootaxa 2012 3346 1 28 journal article 10.5281/zenodo.214261 e6aa9ad1-e38f-4cc2-953c-65d1ad0a96d9 1175-5326 214261 Calliopum simillimum Egg ( Figs 44–46 ). Length 0.70–0.78 mm . Dorsal and ventral side sharply delimited, ventral side only slightly smaller. Longitudinal ridges of ventral side low, with numerous transverse ribs. Dorsal side with large longitudinal ridges. Longitudinal channels are distinct. First larval instar ( Figs 53, 54 ). Length 0.93–2.08 mm . Length of cephaloskeleton 0.19–0.21 mm . Second instar larva ( Figs 81, 82 ). Length 1.74– 3.57 mm . Length of cephaloskeleton 0.30–0.37 mm . Third larval instar ( Figs 96–100 ). Length 2.98–4.85 mm . Anterior spiracles with 8–9 papillae, the two marginal papillae are curved back ( Fig. 82 ). Second and third thoracic segment are almost completely spinous dorsally. Abdominal segments densely spinous, dorsal spines organized in transverse rows and overlap in a rooflike manner. Smooth area behind the dorsal abdominal tubercules and also on ventral side. Lateral parts of abdominal segments and the anal division densely spinous, but spines are rather “shaggy”. Length of cephaloskeleton 0.54–0.57 mm . Puparium ( Fig. 120 ). Length 4.20–4.39 mm . Only puparia reared from larvae collected in nature were measured.