A theoretical or primitive mouth-like opening, particularly in zoological contexts describing early evolutionary stages of organisms with mouths.
From Greek archi- (primitive, first) + stoma (mouth). A zoological term from the 19th century referring to ancestral mouth structures in animal evolution.
Before animals had the mouths we recognize, they had archistomes—primitive mouth-like structures—and this word shows how scientists literally traced the evolution of eating by studying how organisms' mouths changed over millions of years!
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