For approximately 120 million years—from the Carboniferous to the … They show a remarkably complete transition in skeletal features from typical early reptiles (Early Permian Epoch) into true mammals (in the Middle and Late Triassic epochs) through a fossil record lasting about 80 million years. Pelycosaurs are the earliest, most primitive synapsids, a group characterized by a single dermal opening in the skull permitting muscle attachment to the jaw. Pelycosaurs (meaning "basin lizards") were the earliest, and most primitive synapsids; they were not dinosaurs. The pelycosaurs (pronounced PEL-ih-ko-saurz) were previously considered an order, but are now only an informal grouping composed of basal or primitive Late Paleozoic synapsids, sometimes called "mammal-like reptiles".
These quadrupeds appeared during the upper Carboniferous and went extinct during the Permian period (before the Triassic period when the dinosaurs evolved). Pelycosaurs resembled reptiles but were more closely related to mammals. Like archeologists discovering the ruins of a previously unknown civilization buried deep beneath an ancient city, dinosaur enthusiasts are sometimes astonished to learn that entirely different kinds of reptiles once ruled the earth, tens of millions of years before famous dinosaurs like Tyrannosaurus Rex, Velociraptor, and Stegosaurus. This means that the pelycosaurs are not reptiles , since reptiles have two such openings in their skulls. Pelycosaurs were more closely related to the therapsids - "mammalian reptiles" - than to the archosaurs that later evolved into dinosaurs, which means that Dimetrodon was …
Just as you thought, the quick answer is yes, dinosaurs are reptiles. Other articles where Pelycosaur is discussed: Permian Period: Emergence of important reptiles: …are divided into two orders: pelycosaurs and therapsids. By far the most famous pelycosaur – and the one most commonly mistaken for a dinosaur – is Dimetrodon… All dinosaurs, including this allosaurus, were reptiles. They consist of all synapsids excluding the therapsids and their descendants. Pelycosaurs themselves were more closely related to therapsids, or "mammal-like reptiles," than to the archosaurs that spawned the dinosaurs—which … Become a dinosaur expert – visit our main Dinosaur Facts Page! Many prehistoric animal groups are popularly conceived of as dinosaurs, such as ichthyosaurs, mosasaurs, plesiosaurs, pterosaurs, and pelycosaurs (especially Dimetrodon), but are not classified scientifically as dinosaurs, and none had the erect hind limb posture characteristic of true dinosaurs. At first glance, ‘are dinosaurs reptiles’ … Are Dinosaurs Reptiles? Although it looks superficially like a dinosaur, dimetrodon was actually a type of prehistoric reptile known as a pelycosaur, and it lived during the Permian period, 50 million years or so before the first dinosaurs had even evolved.
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