and in polytomy with Physornis and Phorusrhacos as well. The following phylogenetic tree shows the internal relationships of Phorusrhacidae under the exclusion of Brontornis as published by Degrange and colleagues in 2015, which recovers a clade that contains Physornis, Phorusrhacos and Andalgalornis'', among others. References External links Genus Taxonomy Phorusrhacidae Extinct flightless birds Oligocene birds Paleogene birds of South America Deseadan Paleogene Argentina Neogene Argentina Fossils of Argentina Fossil taxa described in 1941 Golfo San Jorge Basin Sarmiento Formation