How To Use Therapsid In A Sentence
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The first fossil reptiles from the Karoo were found in the 1850s by Andrew Geddes Bain and were the first specimens of a new group of ‘reptiles’ called the therapsids, which were recognized as being the distant ancestors of mammals.
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Whether or not his reconstruction corresponds to an actual creature, it at least represents a good morphotype for slightly more derived, but still primitive, therapsids from the Late Permian.
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In all but the role of small insectivore, omnivore, and rodent-like herbivore, the therapsids were eventually supplanted by the archosaurs.
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These included more advanced therapsids such the cynodonts.
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Following the extinction of the Permian therapsids due to the end Permian-extinction, most of the large animals that populated Pangea were archosaurs or archosauromorphs.
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It is even seen in a group of therapsids (ancestors of mammals), the tritylodonts, which lived during the Jurassic.
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Indeed, most workers recognized a geographical and temporal gap between Permo-Carboniferous ‘pelycosaurs’ and therapsid synapsids.
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The dicynodonts as a whole lasted some 50 million years, and the only group of therapsids to outlive them were the cynodonts, which were the direct ancestors of the mammals.
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One group of therapsids, the dicynodonts, were herbivores with a worldwide distribution.
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Consequently, lung ventilation rates and, by extension, metabolic rates of the earliest mammals, and at least some Triassic Period therapsids, are likely to have approached or been equal to those of extant mammals.
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However, he was the first to spot the connection between the early therapsids and the mammals.
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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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Among therapsids, this condition is also present in gorgonopsians and basal therocephalians, but not dinocephalians, anomodonts, or cynodonts.
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It has therefore been suggested that the mammalian class II gene clusters arose after the separation of the synapsids and the therapsids.
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On land amphibians and therapsids (mammal-like reptiles) were both badly affected, while vascular plant diversity dropped by 50 per cent.
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Pelycosaur, therapsid, and mammal represent three evolutionary grades in a single progressive evolutionary axis.
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Pelycosaurs and therapsids are two different orders of reptiles.
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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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In the south, therapsids like sheep-sized herbivorous traversodonts predominated; in the north, archosaurs were more common.
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The Russian and South African sites contain the remains of many therapsids.
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The therapsids of this time belonged to several distinct (albeit related) lineages, none with clear antecedents.
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Evidence for therapsid fur centers on the presence of infraorbital pits and ridges in some lower Triassic cynodonts.
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The model of therapsid relationships proposed by Rubidge and Sidor implies that a crista choanalis evolved at least three times, in biarmosuchians, eutherocephalians, and cynodonts.
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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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This development occurs at the level of the therapsids.
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The terminal Permian catastrophe, which killed off 95% of all types of life, cleared the world of all large therapsids and allowed the proterosuchids to take center stage as the top carnivore.
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The Dinocephalians were among the most primitive of the therapsids or ‘mammal-like reptiles’.
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During the late Permian the dinocephalians suddenly disappeared (possibly due to disease or changing environmental factors), and were replaced by a further wave of more mammalian therapsids.
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This pattern was retained in early therapsids.
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Biarmosuchians are a group of small-to-medium sized carnivorous therapsids known exclusively from Middle to Upper Permian strata in South Africa and Russia.
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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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