 A later species, "M. opsigonus", was found in the Clarendonian Juntura Formation at Juntura, Malheur County, Oregon.Whether the species "M. goliath" belongs into this genus or into "Palaelodus" is not quite certain; it surpasses all forms in the latter genus in size, but is generally similar.It is the earliest representative of "Megapaloelodus", living from the Late Oligocene to the Middle Miocene, and has been found in a wide range of Central European localities, from France to Southern Germany (Ringingen-Frontal 1) and on to the Czech Republic and Hungary; it dwelled in the wetlands created by the rerouting of rivers due to the beginning uplift of the Alps.