分類群・階級等、参考ウェブサイト
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GBIF | Global Biodiversity Information Facility(地球規模生物多様性情報機構). https://www.gbif.org/
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The Paleobiology Database. https://paleobiodb.org/#/
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Fossilworks: Gateway to the Paleobiology Database. http://fossilworks.org/bridge.pl?action=home
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Integrated Taxonomic Information System (ITIS). https://www.itis.gov/
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日本分類学会連合:日本産生物種数調査. http://www.ujssb.org/biospnum/search.php(分類和名)