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Temporal range: Triassic
An artist's illustration of Placodontia gigas
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Sauropterygia
Order: Placodontia
Family: Placodontidae
Cope, 1871
Genus: Placodus
Agassiz, 1833
Referred species
  • Placodus gigas
    (Agassiz, 1833)
  • Placodus inexpectatus
    (Jiang et al., 2008)

Placodus, meaning flat toothed, was the largest of the placodonts, an extinct group of marine reptiles related to turtles.


Weighing about 500 pounds and measuring 12 feet long, Placodus was double the size of the nearest competitor in size for the plcodonts Paraplacodus.


Like all of the placodonts, Placodus was a shellfish eater.