noun
Protista; protist kingdom
Scientific term for the biological kingdom Protista, used in taxonomy.
原生生物界にはアメーバやゾウリムシが含まれる。
The kingdom Protista includes amoebas and paramecia.
原生生物 refers to protists as organisms, while 原生生物界 specifically denotes the taxonomic kingdom Protista.
Compound of 原生 (げんせい, 'primitive, original') + 生物 (せいぶつ, 'living organism') + 界 (かい, 'kingdom'), a calque of the scientific term Protista.