How To Use Pelycosaur In A Sentence
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Between the Carboniferous pelycosaurs and the first Jurassic mammals, the jaw articulation changed.
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Pelycosaurs and therapsids are two different orders of reptiles.
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Pelycosaur, therapsid, and mammal represent three evolutionary grades in a single progressive evolutionary axis.
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All groups of pelycosaurs went extinct by the end of the Permian.
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Nevertheless these primitive animals were more advanced on the road the to mammalian evolution, and, like the pelycosaurs, diverged along several lines as herbivores, carnivores, or omnivores.
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It is a box-like construction, more like a pelycosaur than a mammal, with the large flat maxillae forming the sides, the nasal the top, the the tall premaxilla at the rostral end.
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The earliest occurring and phylogenetically most primitive synapsids are the ‘pelycosaurs’ of traditional terminology.
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These basal forms evolved through the primitive pelycosaur stage, to the therapsids or mammal-like reptiles, and finally the mammals themselves.
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An interesting example of convergent evolution is seen between these pelycosaurs and the unrelated dinosaurs.
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Indeed, most workers recognized a geographical and temporal gap between Permo-Carboniferous ‘pelycosaurs’ and therapsid synapsids.
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None developed the distinctive sail that distinguished many pelycosaur groups.
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Moreover, and to re-emphasize the theme of branching, pelycosaurs included three major subgroups, only two bearing sails on their backs.
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This gap is all the more extreme because pelycosaurs and therapsids are each large, internally-diverse groups.
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Otherwise, we have more of the lumbering and vaguely stegosaur-like "stegodons" seen elsewhere in Azeroth and a bizarre mutation of basilisk that they're calling "Diemetradon" (clearly loosely inspired by the Permian-aged Dimetrodon, which, you'll note, isn't a dinosaur, but, rather, a pelycosaurian synapsid).
Howard Hughes Looks the Other Way
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A characteristic pelycosaur was Dimetrodon, a large predator from the Permian of Texas.
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Whereas the Early Permian pelycosaur record is extensive, Carboniferous pelycosaur remains are rare and poorly known.
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These creatures succeeded the pelycosaurian synapsids as the rulers of the land, until they in turn were supplanted by the archosaurs during the early Triassic.
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This high degree of twist, although common in ophiacodontids, represents the upper limit recorded for pelycosaurs.
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Otherwise, we have more of the lumbering and vaguely stegosaur-like "stegodons" seen elsewhere in Azeroth and a bizarre mutation of basilisk that they're calling "Diemetradon" (clearly loosely inspired by the Permian-aged Dimetrodon, which, you'll note, isn't a dinosaur, but, rather, a pelycosaurian synapsid).
Howard Hughes Looks the Other Way
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This gap is all the more extreme because pelycosaurs and therapsids are each large, internally-diverse groups.
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It may be intermediate in structure between the pelycosaurs and the therapsids.
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The transition between pelycosaurs and therapsids has not been documented.
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I was under the impression that “therapsid” always referred to a kind of synapsid reptile and was distinct from “pelycosaur” another kind of synapsid think dimetrodon.
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