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Turtle I’m Totally Lacking Part of My Day Shirt
This explains how the shoulder girdle, which lies outside the ribcage in other reptiles, ends up inside the ribcage and shell in turtles.The origin of the plastron covering the underside of the turtle is less obvious. The bones at the front end of the plastron correspond to the clavicles and to a bone connecting the clavicles along the midline, or the interclavicle, in the shoulder girdle of other reptiles.EunotosaurusNew research finds that the 260-million-year-old animal Eunotosaurus, with its broad and strongly curvedribs, is a distant precursor of the turtle. (NMNH)The first fossil reptile showing some resemblances to turtles was discovered in 260-million-year-old rocks in South Africa in the 1890s. This unusual animal, called Eunotosaurus, has a short trunk with unusually broad and strongly curved ribs, which partially overlap one another. However, it differed from turtles in many ways, and paleontologists long dismissed the similarities between the two as the result of independent evolution. Based on studies of more recently discovered fossils of this reptile, my former Smithsonian colleague Tyler Lyson and his collaborators recently revived the idea that Eunotosaurus was a distant precursor of turtles.
Turtle I’m Totally Lacking P
art of My Day Shirt
In 2008, the discovery in China of a nearly 220 million years old fossil of an undisputed turtle precursor, represented a major advance in our understanding of the evolution of the turtle shell. This reptile, Odontochelys, apparently lived near or in coastal waters. The fossil has broad, rather straight trunk ribs and lacks any kind of carapace. The great surprise was that it already has a fully formed plastron covering its underside, just as in present-day turtles. Odontochelys was a stem-turtle on a half shell.Preview thumbnail for ‘The Rise of Reptiles: 320 Million Years of EvolutionThe Rise of Reptiles: 320 Million Years of EvolutionWith this single meticulously researched volume, Hans-Dieter Sues paints a complete portrait of reptilian evolution. Numerous photographs of key specimens from around the world introduce readers to the reptilian fossil record, and color images of present-day reptiles illustrate their diversity.
