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The distribution of organic forms is clumpy at any scale from populations to the highest taxonomic categories, and whether considered within clades or within ecosystems. The fossil record provides little support for expectations that the morphological gaps between species or groups of species have increased through time as it might if the gaps were created by extinction of a more homogeneous distribution of morphologies. As the quantitative assessments of morphology have replaced counts ofdoi:10.1111/j.1475-4983.2006.00614.x fatcat:4wvcqj7c4vbvrhv2x6qba3dcl4