The placodonts are fellow Europeans

The placodonts are fellow Europeans
This image shows a reconstruction of the juvenile placodont Palatodonta bleekeri. The teeth are striking compared to other placodonts. Credit: Picture: Reconstruction by Jaime Chirinos

Placodonts were among the first marine reptiles. With their trademark crushing teeth, they fed on shellfish and crustaceans. However, when and where these highly specialized marine reptiles originated remained unclear until now. A 246-million-year-old skull of a juvenile placodont was recently discovered in the Netherlands.

For around 50 million years, placodonts populated the flat of the Tethys Ocean, in modern day Europe and China. The most distinctive feature of these dinosaurs was their teeth: The had two rows of flattened teeth – one on the palate and one on the jawbone – while the lower jaw only had one set of teeth ideal for crushing shellfish and .

The of these placodonts remained unclear. However, a new find in a 246-million-year-old sediment layer now sheds light on the origin and phylogenetic development of the placodonts. As the Swiss and German team headed by Torsten Scheyer, a at the University of Zurich, reveals the skull found in Winterswijk (Netherlands) is the earliest form of all known placodonts. The juvenile animal lived 246 million years ago. At around two centimeters in size, the skull is exceptionally well preserved and its characteristics set it apart from previous placodont discoveries.

The placodonts are fellow Europeans
This is the recently discovered skull of a juvenile placodont from Winterswijk, the Netherlands. Credit: Picture: UZH

Double row of pointed teeth

The basal-most known placodonts to date have the group's trademark double row of crushing teeth in the upper jaw. The flattened teeth that give these animals their name only appear in more derived placodonts. "Unlike all the other placodonts discovered to date, the Winterswijk specimen has conical, pointed teeth instead of flattened or ball-shaped crushing ones," explains Scheyer, "which means the pointed teeth on the lower jaw slotted precisely into the gap between the palate and upper-jawbone teeth when biting."

The group's trademark double row of teeth in the upper jaw is proof that the new find is actually a placodont. According to the researchers, the teeth of Palatodonta bleekeri, the scientific name given to the Winterswijk specimen, were specialized in gripping and piercing soft prey. "The double row of teeth in the new find combined with its considerable age lead us to conclude that it is a very early placodont, from which the later forms developed," says Scheyer. The formation of crushing and the specialization of a diet of shellfish and crustaceans thus developed later within placodont evolution.

European origin confirmed

The small Palatodonta bleekeri skull sheds new light on the ongoing debate on where the placodonts originated: Previous finds suggested origins in the shelf sea areas of either present-day China or Europe. Due to the considerable age of the new Dutch find and its basal form, however, the European origin of the placodonts is deemed confirmed. Scheyer and his colleagues are hoping for further exciting finds in Winterswijk to discover more about the evolution of the placodonts.


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More information: James M. Neenan, Nicole Klein, Torsten M. Scheyer. European origin of placodont marine reptiles and the evolution of crushing dentition in Placodontia. Nature Communications. March 27, 2013. doi: 10.1038/ncomms2633
Journal information: Nature Communications

Citation: The placodonts are fellow Europeans (2013, March 27) retrieved 19 September 2019 from https://phys.org/news/2013-03-placodonts-fellow-europeans.html
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