heliozoan
noun
he·lio·zo·an
ˌhē-lē-ə-ˈzō-ən 
: any of a class (Heliozoa) of free-living spherical usually freshwater protozoans that reproduce by binary fission or budding
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“Heliozoan.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heliozoan. Accessed 24 Jul. 2025.
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