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. The fossils have been dated to the Triassic Period, from the Anisian to Ladinian stages. Considered a possible turtle ancestor due to its wide flattened torso covered in dermal ossicles, but now is considered to only be distantly related. Derived from a sister to Paraplacodus, Cyamodus phylogenetically preceded Placochelys.