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In the 1990s
a swimming bladder which is open to the pharynx that can function as a lung
during the late Carboniferous to early Permian periods
Atlasaurus imelakai was a quadrupedal herbivorous sauropod
between 155 and 145 million years ago
Lystrosaurus, skull, a dicynodont Triceratops In the 1990sLystrosaurus (meaning "shovel lizard", was a genus of Late Permian and Early Triassic Period dicynodont therapsids, which lived around 250 million years ago in what is now Antarctica, India, and South Africa. Four to six species are currently recognized, although from the 1930s to 1970s the number of species was thought to be much higher. Being a dicynodont, Lystrosaurus had only two teeth, a pair of tusk like canines, and is thought to have had a
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