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extant ypresian first appearance(noun, animal, geohistory)
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APASmart Define. (2013). cetacea thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/cetacea/thesaurus/broader
ChicagoSmart Define. 2013. "cetacea thesaurus" https://smartdefine.org/cetacea/thesaurus/broader (accessed September 24, 2026).
HarvardSmart Define 2013, cetacea thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/cetacea/thesaurus/broader>.
MLASmart Define. "cetacea thesaurus" 19 May 2013. Web. 24 September 2026. <https://smartdefine.org/cetacea/thesaurus/broader>