A typical Placodont was about 3 to 6 feet (1 to 2 meters) in length, although the largest Placodonts were perhaps 10 feet (3 meters) long. Some Placodonts resembled rather stout-looking lizards with short limbs, whereas other had bony plates on their back, giving them a more turtle-like appearance. Placodonts were generally heavy, especially those with armour plating, and this, together with the types of desposits in which their fossils are found, suggests that they probably lived in shallow water environments.
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Placodonts are believed to have eaten shellfish such as molluscs and brachiopods. They had large flat teeth that were well suited for this purpose - and it was based on this characteristic that Edward D. Cope chose the name "Placodont" in 1871 - it means "tablet teeth".
Placodonts were marine reptiles that lived between 240 and 213 million years ago
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