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Size comparison of some species of Edaphosaurus.. Edaphosaurus species measured from 0.5 to 3.5 metres (1.6 to 11.5 ft) in length and weighed over 300 kg (660 lb). [5] In keeping with its tiny head, the cervical vertebrae are reduced in length, while the dorsal vertebrae are massive, the tail is deep, the limbs are short and robust, and the ribs form a wide ribcage.
Dimetrodon milleri was described by Romer in 1937. [58] It is one of the smallest species of Dimetrodon in North America and may be closely related to D. occidentalis, another small-bodied species. [51] D. milleri is known from two skeletons, one nearly complete (MCZ 1365) and another less complete but larger (MCZ 1367).
Well-known pelycosaurs include the genera Dimetrodon, Sphenacodon, Edaphosaurus, and Ophiacodon. [9] Pelycosaur fossils have been found mainly in Europe and North America, although some small, late-surviving forms are known from Russia and South Africa. Unlike lepidosaurian reptiles, pelycosaurs might have lacked reptilian epidermal scales.
The Red Beds were first explored by American paleontologist Edward Drinker Cope starting in 1877. [2] Fossil remains of many Permian tetrapods (four-limbed vertebrates) have been found in the Red Beds, including those of Dimetrodon, Edaphosaurus, Seymouria, Platyhystrix, and Eryops. A recurring feature in many of these animals is the sail ...
The teeth of Dimetrodon borealis are long, recurved, and distinctively teardrop-shaped, being widest at the middle rather than the base. The teardrop shape of the teeth is an indication that Dimetrodon borealis belongs to the family Sphenacodontidae.
United States of America [9] Basicranodon. Vaughn. 1958. Syn. Lower Permian [1] United States of America [1] Synonym of Mycterosaurus [10] Bathyglyptus. Case. 1911. Syn. N/A N/A Synonym of Dimetrodon [8] Bathygnathus. Leidy. 1854. Valid. Lower Permian [4] United States of America [4] Brachycnemius. Williston. 1911. Syn. N/A N/A Synonym of ...
Restoration of two individuals of Sphenacodon. The skull is long, deep and narrow, an adaptation for strong jaw muscles. The front teeth are large and dagger-like, whereas the teeth in the sides and rear of the jaw are much smaller (hence the name of the well-known genus Dimetrodon – "two-measure tooth", although all members of the family have this attribute).
The postcranial skeletal material from different individuals includes parts of the backbone with clear evidence of a tall sail very similar to that of Dimetrodon. The limbs and tail are incomplete but probably resembled those of Dimetrodon as well. Like Dimetrodon, Secodontosaurus would have had a short neck, robust body, short limbs, and a ...