Temporal range: Middle to Late Triassic, 245–201.3 Ma
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Placodus, type genus
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Chordata
Class:
Reptilia
Superorder:
†Sauropterygia
Clade:
†Placodontiformes
Order:
†Placodontia Cope, 1871
Subgroups
†Atopodentatus?
†Pararcus
Cyamodontoidea
†Cyamodontidae
†Henodontidae
†Placochelyidae
Placodontoidea
†Paraplacodontidae
†Placodontidae
Placodonts ("tablet teeth") are an extinct order of marine reptiles that lived during the Triassic period, becoming extinct at the end of the period. They were part of Sauropterygia, the group that includes plesiosaurs. Placodonts were generally between 1 and 2 m (3 ft 3 in and 6 ft 7 in) in length, with some of the largest measuring 3 m (9.8 ft) long.
The first specimen was discovered in 1830. They have been found throughout central Europe, North Africa, the Middle East and China.
overturned this view. Class Reptilia Superorder Sauropterygia Order Placodontia Genus Atopodentatus? Genus Pararcus Superfamily Placodontoidea Family...
"tooth") is an extinct genus of marine reptiles belonging to the order Placodontia, which swam in the shallow seas of the middle Triassic period (c. 240...
placodont marine reptiles and the evolution of crushing dentition in Placodontia". Nature Communications. 4: 1621. Bibcode:2013NatCo...4.1621N. doi:10...
taxon, including only Sauropterygia (Nothosauria and Plesiosauria) and Placodontia in it. The terms Enaliosauria and Halisauria have also been used for...
The interrelationships of Placodontia. Historical Biology: Vol. 12, pp. 211–227 Rieppel O 2000. Sauropterygia I. Placodontia, Pachypleurosauria, Nothosauroidea...
of the order Placodontia, and thus erected Helveticosauridae as well as the superfamily Helveticosauroidea to contain it within Placodontia. Nosotti and...
Order Squamata – lizards and snakes Infrasubclass Sauropterygia † Order Placodontia † Order Eosauropterygia † Suborder Pachypleurosauria † Suborder Nothosauria...
placodont marine reptiles and the evolution of crushing dentition in Placodontia". Nature Communications. 4: 1621. Bibcode:2013NatCo...4.1621N. doi:10...
placodont marine reptiles and the evolution of crushing dentition in Placodontia". Nature Communications. 4: 1621. Bibcode:2013NatCo...4.1621N. doi:10...
Li; Torsten M. Scheyer; Lijun Zhao (2019). "A new species of Cyamodus (Placodontia, Sauropterygia) from the early Late Triassic of south-west China". Journal...
description in 1955, Helveticosaurus was classified as a member of the order Placodontia, a group of robust, barrel-bodied marine reptiles similar in lifestyle...
placodont marine reptiles and the evolution of crushing dentition in Placodontia". Nature Communications. 4: 1621. Bibcode:2013NatCo...4.1621N. doi:10...
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