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extant eocene first appearance(noun, animal, geohistory)
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APASmart Define. (1970). clypeaster thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/clypeaster/thesaurus/broader
ChicagoSmart Define. 1970. "clypeaster thesaurus" https://smartdefine.org/clypeaster/thesaurus/broader (accessed September 24, 2026).
HarvardSmart Define 1970, clypeaster thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/clypeaster/thesaurus/broader>.
MLASmart Define. "clypeaster thesaurus" 1 January 1970. Web. 24 September 2026. <https://smartdefine.org/clypeaster/thesaurus/broader>