 "Dasornis" was long mistaken for a diatryma (Gastornithiformes), now strongly suspected to be very close indeed to the Anseriformes.Also, the pelagornithid "Palaeochenoides mioceanus" was initially mistaken for an anseriform, and the same might hold true for the supposed Oligocene swan "Guguschia nailiae".In the former case, however, a "much the more convincing" analysis for a placement outside the Galloanseres was published the year after its description already.