Therapsida
978-613-3-73966-6
6133739665
88
2010-10-09
34.00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Therapsida is a group of synapsids that includes mammals and their immediate evolutionary ancestors. The earliest fossil attributed to Therapsida is believed to be Tetraceratops insignis (Lower Permian), and other than the mammals, all lineages of the therapsids became extinct in the Early Cretaceous period (146 Ma to 100 Ma). Therapsids evolved from a group of pelycosaurs called sphenacodonts. Therapsids became the dominant land animals in the Middle Permian, displacing the pelycosaurs. Therapsida consists of three major clades, the dinocephalians, the herbivorous anomodonts and the mostly carnivorous theriodonts, with the carnivorous biarmosuchians as a paraphyletic assemblage of primitive forms. After a brief burst of evolutionary diversity, the dinocephalians died out in the later Middle Permian (Guadalupian) but the anomodont dicynodonts and the theriodont gorgonopsians and therocephalians flourished, being joined at the very end of the Permian by the first cynodonts.
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