Having a normal or well-developed mouth or opening, particularly used in describing certain microscopic organisms.
From Greek 'eu-' (well) + 'stoma' (mouth) + '-ous' (full of, having). The term specifically contrasts with organisms having abnormal or reduced mouth structures.
In microbiology, eustomatous organisms demonstrate how even single-celled creatures need proper 'mouths' to efficiently capture and process food.
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