Origin and Early Evolution of the Metazoa by Jere H. Lipps, Philip W. Signor

By Jere H. Lipps, Philip W. Signor

Several years in the past, we discovered that the main fashionable principles that were ex­ pressed concerning the foundation and early evolution of the Metazoa looked as if it would were constructed mainly through zoologists utilizing proof from glossy species regardless of the fossil checklist. Paleontologists had, actually, placed forth their very own principles however the zoological and the paleontological facts have been in regards to the challenge, seldom thought of jointly, specially by way of zoologists. We believed that the paleon­ tological documentation of the 1st Metazoa used to be too scattered, too imprecise to Western readers, and masses of it too fresh to were available to our colleagues in zoology. even if that was once totally precise, we concept unmarried quantity reviewing the fossil checklist of the earliest Metazoa will be valuable to many in either paleontology and zoology, particularly in view that lots new informa­ tion has been built within the previous couple of years. a few of this knowledge has been summarized usually articles lately, yet an summary of many of the box doesn't exist. We for this reason equipped this publication in 5 components in order that the facts will be put in standpoint and summarized and inferences made of it. half I intro­ duces the former hypotheses which were proposed for the starting place and early radiation of Metazoa. half II involves precis chapters that set the sedi­ mentological, geochemical, and organic heritage to the identified radiations of Metazoa.

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And Raff, E. , 1970, Respiratory mechanisms and the metazoan fossil record, Nature 228:1003-1005. 22 Chapter 1 Raymond, P. , 1935, Pre-Cambrian life, Bull. Geol. Soc. Am. 46:375-392. Rhoads, D. , and Morse, J. , 1971, Evolutionary and ecologic significance of oxygen-deficient marine basins, Lethaia 4:413-428. Riding, R, 1982, Cyanophyte calcification and changes in ocean chemistry, Nature 299:814-815. Rudwick, M. J. , 1964, The infra-Cambrian glaciation and the origin of the Cambrian fauna, in: Problems in Paleoclimatology (A.

The member is dominated by interstratified mudstones, siltstones, and fine sands deposited in storm-dominated open shelf environments: a lithologic setting ideal for the preservation of traces and the setting of the first occurrences of most Early Cambrian traces (Crimes, 1987). 2. Artifacts of the Record Given the preference of trace and body fossil first appearances for shallow subtidal, subfairweather wave base environments, it can be argued that the pattern of diversification shown in Fig. 2 is simply an artifact of Grand Cycle control of the stratigraphic distribution of lithofacies and only indirectly reflects global evolutionary processes.

R. ), Academic Press, New York, pp. 55-102. , 1982, Oxygen in the Precambrian atmosphere: An evaluation of the geological evidence, Geology 10:141-146. Cloud, P. , 1949, Some problems and patterns of evolution exemplified by fossil invertebrates, Evolution 2:322-350. Cloud, P. , 1968, Pre-metazoan evolution and the origins of the Metazoa, in: Evolution and Environment (E. T. ), Yale University Press, New Haven, Connecticut, pp. 1-72. Cloud, P. , 1976, Beginnings of biospheric evolution and their biogeochemical consequences, Paleobiology 2:351-387.

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