Anasimyia transfuga  Anasimyia transfuga is a Palearctic species of hoverfly. External images  For terms see Morphology of Diptera The wing length 6-8·25 mm. Dark ground colour with steeply inclined hooked markings (the inner limb is strongly oblique). Very similar to "A. contracta", but "transfuga" has the lateral margins of tergite 2 less concave than in "contracta". There are also differences in the grey dusting of the sternites (sternites 2 and 3 are completely grey dusted in the male of "transfuga"). Keys and accounts   A wetland species found on tall emergent pond side vegetation, margins of mesotrophic pools and lakes with "Scirpus" or "Sparganium". Flowers visited include "Caltha palustris", "Ranunculus repens", white umbellifers, "Sonchus arvensis", "Sorbus aucuparia" and "Taraxacum". Flies early May to July. The larva is aquatic and microphagous in rotting plant debris. Flies April to October. A Palearctic species with a wide distribution in Europe East to Siberia.