古細菌(Kóo-sè-khún,archaea)是現此時生物分類三域系統(three-domain system)上頂層的一个分類,另外二个是細菌真核生物,古細菌和細菌仝款,是無細胞核(cell nucleus)的單細胞生物,算是一種原核生物(prokaryote),往過"五界系統"的分類共掠做原核生物界(Monera),頭起先掠準怹計是極限生物(extremophile),尾仔發現逐種環境攏有古細菌佇咧。

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