An animal whose mouth or opening develops from an ancient embryonic structure; used in zoological classification systems.
From Greek 'archi-' (primitive, first) and 'stoma' (mouth), describing organisms whose mouth structure reflects an ancient or primitive developmental pattern.
This zoological term divides animals based on where their mouth develops in the embryo—some organisms are archeostomes (primitive mouth) and others are deuterostomes (secondary mouth), revealing deep evolutionary relationships.
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