Definition
Segmentation is a difficult term to satisfactorily define. Many taxa (for instance the molluscs) have some form of serial repetition in their units, but are not conventionally thought of as segmented. Truly segmented animals would be considered to have organs that were repeated, or having a body composed of self-similar units, but talking of a "segmented organism" is vague: rather, one should refer to which parts of the organism are segmented.
Read more about this topic: Segmentation (biology)
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