Review of the Merodon natans group with description of a new species, a key to the adults of known species of the natans lineage and first descriptions of some preimaginal stages

Light micrographs of Merodon pulveris larva. A mandibles B head C primordia of pupal spiracles D posterior part of the abdomen in dorsal view E posterior part of the abdomen in ventral view. Abbreviations: am – antenno-maxillary organs, as – anterior spiracle, eat – external accessory teeth, iat – internal accessory teeth, lp – lappets, mh – mouthhooks, pps – primordia of pupal spiracles, prp – posterior respiratory process. Scale bars: 200 μm (A, B); 1 mm (C, D); 500 μm (E).