四足類：修订间差异

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-! colspan=7 style="background:#ddf8f8;" | [[IUCN]] 对现存四足动物有关数据的估计（2014年）<ref name=IUCN1014>The World Conservation Union. 2014. ''[[IUCN Red List of Threatened Species]]'', 2014.3. Summary Statistics for Globally Threatened Species. [http://cmsdocs.s3.amazonaws.com/summarystats/2014_3_Summary_Stats_Page_Documents/2014_3_RL_Stats_Table_1.pdf Table 1: Numbers of threatened species by major groups of organisms (1996–2014)] {{Wayback|url=http://cmsdocs.s3.amazonaws.com/summarystats/2014_3_Summary_Stats_Page_Documents/2014_3_RL_Stats_Table_1.pdf |date=20150224091921 }}.</ref>
+! colspan=7 style="background:#ddf8f8;" | [[IUCN]] 对现存四足动物有关数据的估计（2014年）<ref name=IUCN1014>The World Conservation Union. 2014. ''[[IUCN Red List of Threatened Species]]'', 2014.3. Summary Statistics for Globally Threatened Species. [http://cmsdocs.s3.amazonaws.com/summarystats/2014_3_Summary_Stats_Page_Documents/2014_3_RL_Stats_Table_1.pdf Table 1: Numbers of threatened species by major groups of organisms (1996–2014)] .</ref>
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