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eocene fish(noun, geohistory, eocene, fish)
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APASmart Define. (1970). Protacanthodes thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/protacanthodes/thesaurus/broader
ChicagoSmart Define. 1970. "Protacanthodes thesaurus" https://smartdefine.org/protacanthodes/thesaurus/broader (accessed September 26, 2026).
HarvardSmart Define 1970, Protacanthodes thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/protacanthodes/thesaurus/broader>.
MLASmart Define. "Protacanthodes thesaurus" 1 January 1970. Web. 26 September 2026. <https://smartdefine.org/protacanthodes/thesaurus/broader>