Cyamodus

Cyamodus (pron.: SIE-ah-MO-dus) is a genus of placodonts discovered from fossil remains in Germany in the early-to-mid-19th century and was named by Christian Erich Hermann von Meyer in 1863. Cyamodus was a heavily armored swimmer, 1.3 meters (4.3 feet) long, that fed mainly on shellfish that it was specialized to uproot and crush with its powerful jaws.