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      AUTECOLOGY AND THE FILLING OF ECOSPACE: KEY METAZOAN RADIATIONS

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      Palaeontology
      Wiley-Blackwell

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          The Niche Exploitation Pattern of the Blue-Gray Gnatcatcher

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            The Mesozoic marine revolution: evidence from snails, predators and grazers

            Tertiary and Recent marine gastropods include in their ranks a complement of mechanically sturdy forms unknown in earlier epochs. Open coiling, planispiral coiling, and umbilici detract from shell sturdiness, and were commoner among Paleozoic and Early Mesozoic gastropods than among younger forms. Strong external sculpture, narrow elongate apertures, and apertural dentition promote resistance to crushing predation and are primarily associated with post-Jurassic mesogastropods, neogastropods, and neritaceans. The ability to remodel the interior of the shell, developed primarily in gastropods with a non-nacreous shell structure, has contributed greatly to the acquisition of these antipredatory features.
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              A factor analytic description of the Phanerozoic marine fossil record

              Data on numbers of marine families within 91 metazoan classes known from the Phanerozoic fossil record are analyzed. The distribution of the 2800 fossil families among the classes is very uneven, with most belonging to a small minority of classes. Similarly, the stratigraphic distribution of the classes is very uneven, with most first appearing early in the Paleozoic and with many of the smaller classes becoming extinct before the end of that era. However, despite this unevenness, aQ-mode factor analysis indicates that the structure of these data is rather simple. Only three factors are needed to account for more than 90% of the data. These factors are interpreted as reflecting the three great “evolutionary faunas” of the Phanerozoic marine record: a trilobite-dominated Cambrian fauna, a brachiopod-dominated later Paleozoic fauna, and a mollusc-dominated Mesozoic-Cenozoic, or “modern,” fauna. Lesser factors relate to slow taxonomic turnover within the major faunas through time and to unique aspects of particular taxa and times.
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                Author and article information

                Journal
                Palaeontology
                Palaeontology
                Wiley-Blackwell
                0031-0239
                1475-4983
                January 2007
                January 2007
                : 50
                : 1
                : 1-22
                Article
                10.1111/j.1475-4983.2006.00611.x
                1eca9efe-a9e4-4339-adbf-13ec17360f36
                © 2007

                http://doi.wiley.com/10.1002/tdm_license_1.1

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