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Sauropsida: Amniote, Reptile, Dinosaur, Bird, Synapsid, Mammal, Hesperornis

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Sauropsida: Amniote, Reptile, Dinosaur, Bird, Synapsid, Mammal, Hesperornis

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    Available in PDF Format | Sauropsida: Amniote, Reptile, Dinosaur, Bird, Synapsid, Mammal, Hesperornis.pdf | Unknown
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High Quality Content by WIKIPEDIA articles! Sauropsida is a group of amniotes that includes all existing reptiles, dinosaurs, and birds. The Sauropsida is distinguished from Theropsida more commonly called Synapsida, which includes mammals. The term Sauropsida has a long history, and hails back to Thomas Henry Huxley, and his opinion that birds had risen from the dinosaurs. He based this chiefly on the fossils of Hesperornis and Archaeopteryx, that were starting to become known at the time. In the Hunterian lectures delivered at the Royal College of Surgeons in 1863, Huxley grouped the vertebrate classes informally into Mammals, Sauroids, and Ichthyoids based on the gaps in physiological traits and lack of transitional fossils that seem to exist between the three groups. He subsequently proposed the names of Sauropsida and Ichthyopsida for the two latter. It is worth noting that mammal-like reptiles were poorly known and understood at the time Huxley gave his systematic lecture, though the synapsid Dicynodon had been described as a reptile by Richard Owen as early as 1845.   show more
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  • PDF | 180 pages
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  • Betascript Publishing
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  • 10
  • Science Math

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