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By Doris M. Kermack, Kenneth A. Kermack (auth.)

This e-book isn't really meant to offer a whole and complete account of the Mesozoic mammals, and neither is it meant as a instruction manual for study staff learning pre-Tertiary mammals. Our purpose is to provide an account of the beginning and evolution of yes of the characters of the Mammalia. now we have attempted to painting the fossils we describe because the dwelling animals they as soon as have been, now not as lifeless bones. Our account ends with the top of the decrease Cretaceous, due to the fact by means of that point the foremost characters of the mammals had turn into confirmed. There exist a couple of characters which, at present day, are limited to the Mammalia. those contain: (1) a jaw articulation shaped via the squamosal and the dentary; (2) a sequence of 3 bones, malleus, incus and stapes connecting the tympanic membrane to the internal ear; (3) the presence of hair or fur; (4) the presence of milk-glands within the girl; (5) the left aortic arch is the systemic arch; (6) the phalangeal formulation in either manus and pes is 2.3.3.3.3; (7) the various tooth have a couple of root. of those characters (1) or (2) are adequate by way of themselves to outline a mammal; characters (6) and (7) are recognized to were already in life in a number of the mammal-like reptiles - the ancestors of the mammals.

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