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and eventually went extinct during the early Triassic some 225 million years ago
This class also includes crabs
was discovered by Laurie Trexler in 1979 and described by dinosaur paleontologists Jack Horner and Robert Makela as the holotype of a new species
annectens exhibits one of the most striking examples of the "duckbill" snout common to hadrosaurs
dubbed Ida
Edaphosaurus, skull, sculpture Quetzalcoatlus and eventually went extinct duringEdaphosaurus, (meaning "pavement lizard" for dense clusters of teeth) is a genus of extinct edaphosaurid synapsid that lived in what is now North America and Europe around 300 to 280 million years ago, during the late Carboniferous to early Permian periods. The American paleontologist Edward Drinker Cope first described Edaphosaurus in 1882, naming it for the "dental pavement" on both the upper and lower jaws, from the Greek edaphos ("ground"; also
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