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Prehistoric animals of the Carboniferous period, during the Paleozoic Era See also the preceding Category:Devonian animals and the succeeding Category:Permian animals Subcategories
The Carboniferous (/ ˌ k ɑːr b ə ˈ n ɪ f ər ə s / KAR-bə-NIF-ər-əs) [6] is a geologic period and system of the Paleozoic era that spans 60 million years, from the end of the Devonian Period 358.86 Ma (million years ago) to the beginning of the Permian Period, 298.9 Ma.
The synapsid lineage became distinct from the sauropsid lineage in the late Carboniferous period, between 320 and 315 million years ago. [2] The only living synapsids are mammals, [3] while the sauropsids gave rise to the dinosaurs, and today's reptiles and birds along with all the extinct amniotes more closely related to them than to mammals. [2]
A period is equivalent to a chronostratigraphic system. [14] [13] There are 22 defined periods, with the current being the Quaternary period. [2] As an exception, two subperiods are used for the Carboniferous Period. [14] An epoch is the second smallest geochronologic unit. It is equivalent to a chronostratigraphic series.
3 By period or other grouping. 4 See also. Toggle the table of contents. ... List of prehistoric mammals; List of fossil bird genera; List of crurotarsan genera ...
Carboniferous animals of the Carboniferous Period in North America, during the Paleozoic Era See also the preceding Category:Devonian animals of North America and the succeeding Category:Permian animals of North America
Carboniferous Russia Aisenverg, 1979 Chesterian: 333 318.1 age Carboniferous North America Worthen, 1860 Chewtonian: 473 471 age Ordovician Australia Harris & Thomas, 1938 Chokierian: 325 324.5 sub-age Carboniferous regional Chokier, Belgium Hodson (1957) Cincinnatian: 451 443.7 ± 1.5 epoch Ordovician North America Cincinnati: Meek & Worthen, 1865
Comparing this to other mammals, it can be inferred that the first mammals to gain sexual differentiation through the existence or lack of SRY gene (found in the y-Chromosome) evolved only in the therians. Early mammals and possibly their eucynodontian ancestors had epipubic bones, which serve to hold the pouch in modern marsupials (in both sexes).