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Kear and Lee, 2005

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A primitive protostegid from Australia and early sea turtle evolution

1. Benjamin P Kear1,2,* and
2. Michael S.Y Lee1,2

+ Author Affiliations

1School of Earth and Environmental Sciences, University of Adelaide
Adelaide 5005, Australia
2Earth Sciences Section, South Australian Museum
North Terrace, Adelaide 5000, Australia

1. Author and address for correspondence: Earth Sciences Section, South Australian Museum, North Terrace, Adelaide 5000, Australia (kear.ben@saugov.sa.gov.au)


[2]Sea turtles (Chelonioidea) are a prominent group of modern marine reptiles whose early history is poorly understood. [3]Analysis of exceptionally well preserved fossils of Bouliachelys suteri gen. et sp. nov., a large-bodied basal protostegid (primitive chelonioid) from the Early Cretaceous (Albian) of Australia, indicates that early sea turtles were both larger and more diverse than previously thought. [1]The analysis implies at least five distinct sea turtle lineages existed around 100 million years ago. Currently, the postcranially primitive Ctenochelys and Toxochelys are interpreted as crown-group sea turtles closely related to living cheloniids (e.g. Chelonia); in contrast, the new phylogeny suggests that they are transitional (intermediate stem-taxa) between continental testudines and derived, pelagic chelonioids.
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