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      The onset of the ‘Ordovician Plankton Revolution’ in the late Cambrian

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          Most cited references166

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          REPRODUCTIVE and LARVAL ECOLOGY OF MARINE BOTTOM INVERTEBRATES

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            The Cambrian conundrum: early divergence and later ecological success in the early history of animals.

            Diverse bilaterian clades emerged apparently within a few million years during the early Cambrian, and various environmental, developmental, and ecological causes have been proposed to explain this abrupt appearance. A compilation of the patterns of fossil and molecular diversification, comparative developmental data, and information on ecological feeding strategies indicate that the major animal clades diverged many tens of millions of years before their first appearance in the fossil record, demonstrating a macroevolutionary lag between the establishment of their developmental toolkits during the Cryogenian [(850 to 635 million years ago (Ma)], and the later ecological success of metazoans during the Ediacaran (635 to 541 Ma) and Cambrian (541 to 488 Ma) periods. We argue that this diversification involved new forms of developmental regulation, as well as innovations in networks of ecological interaction within the context of permissive environmental circumstances.
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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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                Author and article information

                Journal
                Palaeogeography, Palaeoclimatology, Palaeoecology
                Palaeogeography, Palaeoclimatology, Palaeoecology
                Elsevier BV
                00310182
                September 2016
                September 2016
                : 458
                :
                : 12-28
                Article
                10.1016/j.palaeo.2015.11.003
                8f859de4-3383-4798-b017-3099d41f1229
                © 2016

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