[23], Paleontologist Alfred Romer erected the species Dimetrodon natalis in 1936, previously described as Clepsydrops natalis.
Fossils now attributed to Dimetrodon were first studied by American paleontologist Edward Drinker Cope in the 1870s. This group described mammal-like reptiles, and this particular creature had some characteristic of a mammal. [21] Layered lamellar bone makes up most of the neural spine's cross-sectional area, and contains lines of arrested growth that can be used to determine the age of each individual at death.
[12] The upper margin of the skull slopes downward in a convex arc to the tip of the snout.
In 1927, fossils of the Dimetrodon were found that have longer tails. The theory is that Dimetrodon was active in the early morning when the sun rose. The researchers concluded that the sail of Dimetrodon grew at a much faster rate than was necessary for thermoregulation, and suggested that sexual selection was the primary reason for its evolution. The pterygoids ran from the Pterygoid processes of the sphenoid and the sphenoid bone to the articular, one of the bones in the lower jaw, and caused a backward movement of the mandible. Within Sphenacodontia is the group Sphenacodontoidea, which in turn contains Sphenacodontidae and Therapsida. Dimetrodon may have had 'scales' on its belly like that of a rat on its tail.
Dimetrodon, (genus Dimetrodon), extinct relative of primitive mammals that is characterized by a large, upright, sail-like structure on its back. [62] In 1999, a group of mechanical engineers created a computer model to analyze the ability of the sail to regulate body temperature during different seasons, and concluded that the sail was beneficial for capturing and releasing heat at all times in the year. [60] Another is that the long neural spines could have stabilized the trunk by restricting up-and-down movement, which would allow for a more efficient side-to-side movement while walking.
[47] Remains have been found in Texas and Oklahoma.
Dimetrodon was found to lack adaptations for preventing "crack" propagation. Most fossils have been found in the southwestern United States, the majority c… Dimetrodon and all other Early Permian land vertebrates are assumed to have been cold-blooded or poikilothermic, relying on the sun to maintain a high body temperature.
It could also have been used to scare off potential predators, or as a method for attracting mates. [54] Romer and Price assigned Case and Williston's specimens to a newly erected genus and species, Secodontosaurus longiramus, that was closely related to Dimetrodon.[35][55].
[32] In 1940, Romer and Price recognized that the D. longiramus material belonged to the same taxon as another specimen described by paleontologist Samuel Wendell Williston in 1916, which included a similarly elongated mandible and a long maxilla. Based on the osteology of the temporal region, the posterior part of the palate and mandible, powerful jaw muscles of Dimetrodon was found to have differentiated.
It is now considered a synonym of Dimetrodon macrospondylus. The most striking feature of Dimetrodon has been the one-meter long protrusions at the back of the spine, the spinous processes also referred to as spines. Its skull was more heavily built than a dinosaur's. Staatliches Museum für Naturkunde Karlsruhe, Proceedings of the American Philosophical Society, Synapsid § Linnaean and cladistic classifications, University of Michigan Museum of Natural History, http://www.dictionary.com/browse/dimetrodon, "Dimetrodon is Not a Dinosaur: Using Tree Thinking to Understand the Ancient Relatives of Mammals and their Evolution", "A new basal sphenacodontid synapsid from the Late Carboniferous of the Saar-Nahe Basin, Germany", "Parallelism in the evolution of the Permian reptilian faunas of the Old and New Worlds", "Synapsida: mammals and their extinct relatives", "Autapomorphies of the main clades of synapsids", "A mixed-age classed 'pelycosaur' aggregation from South Africa: earliest evidence of parental care in amniotes? It more likely ate small vertebrates and insects. This feature is also found on the dinosaur Spinosaurus, as these spines have a wide base and then his long and slender with a pointed tip.
Their crookedness suggests that soft tissue may not have extended all the way to the tips of the spines, meaning that the sail's webbing may not have been as extensive as it is commonly imagined. Take your favorite fandoms with you and never miss a beat.
[35] Williston did not consider his specimen to belong to Dimetrodon but instead classified it as an ophiacodontid. [23] The large sail of Dimetrodon is thought to have developed gradually from these smaller crests, meaning that over most of the sail's evolutionary history, thermoregulation could not have served an important function.
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