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1 December 2013 Redescription of Crossvallia unienwillia: The only Paleocene Antarctic Penguin
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Abstract

Redescribed and reinterpreted here is a partial skeleton of the oldest Antarctic penguin, Crossvallia unienwillia from the late Paleocene of Marambio (Seymour) Island. A thorough morphological analysis of limb bones (humerus, femur and tibiotarsus) allowed us to report both an amended reconstruction of type specimens and a revised taxonomic diagnosis of this large-sized early penguin. Moreover, an additional skeletal element, a single thoracic vertebra, is described for the first time. C. unienwillia is characterized by a mixture of features typical of both geologically older and younger penguins, supplemented by characters that are obviously unique. The above-mentioned findings shed new light on the very beginning of penguin evolution.

Piotr Jadwiszczak, Carolina Acosta Hospitaleche, and Marcelo Reguero "Redescription of Crossvallia unienwillia: The only Paleocene Antarctic Penguin," Ameghiniana 50(6), 545-553, (1 December 2013). https://doi.org/10.5710/AMGH.09.10.2013.1058
Published: 1 December 2013
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