Placodontia

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Placodontia

[‚plā·kə′dän·chə]
(paleontology)
A small order of Triassic marine reptiles of the subclass Euryapsida characterized by flat-crowned teeth in both the upper and lower jaws and on the palate.

Placodontia

 

an order of fossil marine reptiles of the subclass Synaptosauria. Placodonts lived during the Triassic. They resembled turtles owing to their armored back and abdomen. Their elongate body, which reached 2.5 m long, resembled that of a dugong. The skull was massive and enlarged posteriorly. The teeth were powerful and adapted for grinding the shells of mol-lusks—the principal food of placodonts. The limbs were flipperlike and had shortened phalanges. Placodonts have been found in Western Europe.

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A durophagous dentition has been described for several clades of Middle Triassic marine reptiles: placodonts (but see Diedrich, 2010 for an alternative interpretation), some ichthyosaurs (Omphalosaurus, Tholodus, etc.
Moreover, the sediments of the site were deposited in a shallow marine carbonate ramp (Calvet and Tucker, 1988), where we would expect to find placodonts rather than ichthyosaurs, usually found in deposits of open marine settings.
Placodonts occur in the Muschelkalk of Spain and possibly in the Keuper as well (their remains have been reported from about 10 localities, for further details see Sanz et al.
Placodonts and nothosaurs are known from Riba de Santiuste-Tordelrabano (26) and Rillo de Gallo (27) (Guadalajara) localities (Alafont, 1999).