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Cretaceous Antarctic plesiosaurs:stratigraphy,systematics and paleobiogeography

Advances in Polar Science 2019年第3期30卷 210-227页

作者： Jose Patricio O’GORMAN Rodrigo OTERO Marcelo REGUERO Zulma GASPARINI División Paleontología Vertebrados Museo de La PlataUniversidad Nacional de La PlataPaseo del Bosque s/n.B1900FWALa PlataArgentina Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET) ArgentinaGodoy Cruz 2290C1425FQBCABAArgentina Red Paleontológica U-Chile Laboratorio de Ontogenia y FilogeniaDepartamento de BiologíaFacultad de CienciasUniversidad de ChileLas Palmeras 3425SantiagoChile Instituto Antártico Argentino 25 de Mayo 1143B1650HMKSan MartínBuenos AiresArgentina

The last twenty million years(Maastrichtian–Santonian)of Southern Hemisphere plesiosaur history is especially well recorded in the Weddellian Province(Patagonia;Western Antarctica and New Zealand).The oldest late Cretaceous plesiosaurs,two specimens referred to Polycotylidae indet.,come from the Santonian levels of the Santa Marta Formation,while the oldest elasmosaurids come from the lower Campanian of the same formation.In the lower Maastrichtian of the Snow Hill Island Formation the non-aristonectine elasmosaurid Vegasaurus molyi is recorded together with other non-diagnosable elasmosaurid specimens,but no aristonectines are present.Aristonectines appears in the Antarctic record in the upper Maastrichtian of the lópez de Bertodano Formation and are represented by Morturneria and cf.Aristonectes.The specimens from the upper Campanian previously referred to Aristonectinae indet.are referred to Elasmosauridae indet.,shortening the temporal record of Aristonectinae in Antarctica.Therefore aristonectines appears in the Antarctic record in the upper Maastrichtian of the lópez de Bertodano Formation and are represented by Morturneria and cf.Aristonectes.The Antarctic Cretaceous elasmosaurids show a paleobiogeographic connection with South America and New Zealand(Weddellian Province).This connection is indicated by the shared presence of the Aristonectinae Kaiwhekea katiki(New Zealand)and Aristonectes(Argentina and Chile).Recent phylogenetic analysis recovered the aristonectines within the Weddellonectia clade,which includes the aristonectines and the non-aristonectines Vegasaurus molyi(Isla Vega,Antarctica);Kawanectes lafquenianum(Argentina);Morenosaurus stocki and Aphrosaurus furlongi(California).Among the Weddellonectia,the aristonectines show a relatively large body size and extremely derived features and probably occupied a trophic niche that differed from the trophic niche of other elasmosaurids.By way of contrast Kawanectes lafquenianum is an extremely small body-sized elasmosaurid restricted to marginal marine

关键词： Elasmosauridae Aristonectinae Polycotylidae Santa Marta Formation Snow Hill Island Formation lópez de Bertodano Formation Weddellonectia

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