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About: Petrolacosaurus     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : umbel-rc:Reptile, within Data Space : dbpedia.org associated with source document(s)

Type: yago:WikicatCarboniferousReptilesyago:Animal100015388yago:Chordate101466257yago:LivingThing100004258yago:Object100002684yago:Organism100004475yago:PhysicalEntity100001930yago:Reptile101661091yago:Vertebrate101471682yago:Whole100003553yago:WikicatExtinctReptilesyago:WikicatPrehistoricReptilesyago:WikicatPrehistoricReptilesOfNorthAmericayago:WikicatReptilesumbel-rc:Reptile New Facet based on Instances of this Class

Petrolacosaurus ("rock lake lizard") is an extinct genus of diapsid reptile from the late Carboniferous period. It was a small, 40-centimetre (16 in) long reptile, and the earliest known reptile with two temporal fenestrae (holes at the rear part of the skull). This means that it was at the base of Diapsida, the largest and most successful radiation of reptiles that would eventually include all modern reptile groups, as well as dinosaurs (which survive to the modern day as birds) and other famous extinct reptiles such as plesiosaurs, ichthyosaurs, and pterosaurs. However, Petrolacosaurus itself was part of Araeoscelida, a short-lived early branch of the diapsid family tree which went extinct in the mid-Permian.