Obdurodon is an extinct monotreme genus containing three species. Individuals of Obdurodon differed from modern platypuses in that adult individuals retained their molar teeth (in the modern platypus, individuals lose all of their teeth upon reaching adulthood). Compared to the modern platypus, which is a mostly benthic forager, Obdurodon foraged pelagically. The description of a new genus and species of extinct ornithorhynchid, a family of the Monotremata, published in 1975 and noted as the e