Question

what is tagmatization​

Answer 1

Tagmatization grouped adjacent metameres into larger functional units, tagma, responsible for performing specialized tasks. In addition to how the segments were organized into tagma, another important difference between the two phyla is that arthropods have paired appendages on each their metameres.

Answer 2

In biology a tagma is a specialized grouping of multiple segments or metameres into a coherently functional morphological unit. Familiar examples are the head, the thorax, and the abdomen of insects. The segments within a tagma may be either fused or so jointed as to be independently moveable.