Acta Palaeontologica Polonica

New skeleton from the early Oligocene of Germany indicates a stem-group position of diomedeoidid birds

Vanesa L. De Pietri, Jean-Pierre Berger, Claudius Pirkenseer, Laureline Scherler, and Gerald Mayr

Acta Palaeontologica Polonica 55 (1), 2010: 23-34 doi:

We report a new specimen of the extinct procellariiform species Diomedeoides brodkorbi (Aves, Diomedeoididae) from the early Oligocene (Rupelian) of Rheinweiler in southwestern Germany. The well−preserved partial skeleton allows the recognition and reassessment of new osteological details that bear on the phylogenetic affinities of diomedeoidids. The presence on the coracoid of a deeply excavated, cup−like facies articularis for the scapula suggests a stem group position of the Diomedeoididae within Procellariiformes, because this trait also occurs in stem−group representatives of several avian groups, as well as in Mesozoic non−neornithine birds, and is a plesiomorphic character. We hypothesize that the similarities of Diomedeoides to extant southern storm−petrels (Oceanitinae), such as the long mandibular symphysis, the small processus supracondylaris dorsalis and the long legs are plesiomorphic for Procellariiformes.

Key words: Aves, Diomedeoididae, phylogeny, stem−group, Oligocene, Rupelian,Upper Rhine Graben, Germany.

Vanesa L. De Pietri [], Naturhistorisches Museum der Buergergemeinde Bern, Bernastrasse 15, CH-3005 Bern, Switzerland; Jean-Pierre Berger [], Claudius Pirkenseer [], and Laureline Scherler [], Dept. Geosciences-Earth Sciences, Chemin du Musée 6, University Fribourg, CH-1700 Fribourg, Switzerland; Gerald Mayr [], Forschungsinstitut Senckenberg, Sektion Ornithologie, Senckenberganlage 25, 60325 Frankfurt am Main, Germany.