Several picture-winged flies native to North America are commonly confused with fruit flies. Were they comparable, in terms of biology and habitat, that would not bode well for the picture-winged flies, as fruit flies deposit their eggs in living, healthy plant tissue and their larvae live and feed on the host plant. By contrast, the larvae of most species of picture-winged flies (today classified under the family Ulidiidae) are saprophagic, that is, they feed on dead, decaying tissue… [...]