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<p>commonly diversity loss among <a href="page.php?w=Taxonomy">taxonomic</a> units. Most early papers used <a href="page.php?w=Family_%28taxonomy%29">families</a> as the unit of taxonomy, based on compendiums of marine animal families by . Later papers by <a href="page.php?w=Jack_Sepkoski">Sepkoski</a> and other authors switched to <a href="page.php?w=genera">genera</a>, which are more precise than families and less prone to taxonomic bias or incomplete sampling relative to species. These are several major papers estimating loss or ecological impact</p><p>
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