Additional Pelagornithidae remains from Seymour Island, Antarctica. (April 2020)

• Record Type: Journal Article
• Authors: Acosta Hospitaleche, Carolina; Reguero, Marcelo
• Is Part Of: Journal of South American earth sciences. Volume 99(2020)
• Publication Date: 2020-04
• Subjects: Ypresian -- Bartonian -- Paleogene -- Eocene -- Marambio -- Odontopterigyformes -- Dentary; Geology -- Latin America -- Periodicals; Earth sciences -- Latin America -- Periodicals; Geology -- Antarctica -- Periodicals; Earth sciences -- Antarctica -- Periodicals; Geology -- Caribbean Area -- Periodicals; Earth sciences -- Caribbean Area -- Periodicals; Géologie -- Amérique latine -- Périodiques; Sciences de la terre -- Amérique latine -- Périodiques; Géologie -- Antarctique -- Périodiques; Sciences de la terre -- Antarctique -- Périodiques; Géologie -- Caraïbes (Région) -- Périodiques; Sciences de la terre -- Caraïbes (Région) -- Périodiques; Earth sciences; Geology; Antarctica; Caribbean Area; Latin America; Periodicals; 550.5
• DOI: 10.1016/j.jsames.2020.102504
• Languages: English
• ISSNs: 0895-9811

Abstract

Abstract: Two incomplete mandibles are assigned to Pelagornithidae given the presence of a well marked neurovascular furrow and the unique bony projections, or "pseudo-teeth", along the crista tomialis . Specimens IAA-Pv 175 from Ypresian levels of La Meseta Alloformation (Cucullaea I Allomember), and IAA-Pv 823 from Bartonian beds of the Submeseta Alloformation, in Seymour Island (Antarctic Peninsula, West Antarctica) corresponds to the morpho-type 1, previously proposed for Antarctic pseudo-tooth birds. The intermediate condition of the pseudo-teeth of these specimens reinforces the idea that diet changed from piscivory to molluscivory along the evolutive history of the group. Highlights: Two new mandibles of Pelagornithidae from Antarctica are reported. The new materials analyzed here extend the record of the pseudo-toothed belonging to morphotype 1 from the Ypressian to the Priabonian. The time of greatest diversification of pseudo-tooth birds in Antarctica (middle-late? Eocene) coincides with this evolutionary event on a global scale.