|Conflicto antarcticus |
Tambussi, Degrange, De Mendoza, Sferco & Santillana, 2019
Illustration by H. Santiago Druetta facebook.com/HSantiagoDruetta
A new Anseriformes, Conflicto antarcticus gen. et sp. nov., represented by associated bones of a single individual, from the early Palaeocene of Antarctica is described. The new taxon is unlike any other known member of the order. Conflicto antarcticus is a medium-sized (2 kg) stem anseriform. The forelimb and pectoral girdle bones suggest that it was a flying bird, and the bones of the hindlimb show that it had elongated legs. The os quadratum represents a unique combination of features; some are similar to the features of the ancestral quadrate for galloanserines and some are similar to Anseriformes, but features such as the presence of three foramina are exclusive among Neornithes. The incisura or foramen nervi suracoracoidei is absent in C. antarcticus, as in most anatids and all Galliformes. Phylogenetic analysis shows that C. antarcticus + Anatalavis oxfordi is the most basal stem Anseriformes clade. This implies that the duck-type beak must have developed at an early stage of anseriform evolution. Conflicto antarcticus represents one (and possibly the most) substantial record of a non-marine Palaeocene bird from the Southern Hemisphere and supports the hypothesis that Neognathae had already diversified in the earliest Palaeocene.
Keywords: Antarctica, Anseriformes, Conflicto antarcticus, Palaeocene, phylogeny
Aves Linnaeus, 1758
Neognathae Pycraft, 1900
Galloanseres Sibley & Ahlquist, 1990
Order Anseriformes (Wagler, 1831)
Conflicto gen. nov.
Derivation of name: Conflicto, from the Latin conflictus (contradiction, masculine in gender), owing to the controversial systematic position of the taxon.
Conflicto antarcticus sp. nov.
Derivation of name: Relative to the geographical area of origin, Antarctica.
Claudia P. Tambussi, Federico J. Degrange, Ricardo S. De Mendoza, Emilia Sferco and Sergrio Santillana. 2019. A Stem Anseriform from the early Palaeocene of Antarctica provides New Key Evidence in the Early Evolution of Waterfowl. Zoological Journal of the Linnean Society. 186(3); 673–700. DOI: 10.1093/zoolinnean/zly085
Nueva clave para comprender la evolución del pico de pato conicet.gov.ar/nueva-clave-para-comprender-la-evolucion-del-pico-de-pato/