In
invertebrate biology, a tagma (plural tagmata) is a specialized grouping of
arthropodan segments, such as the head, the
thorax, and the
abdomen with a common function. The segments of a tagma may be either fused or moveable.Tagma divisions vary among
taxa. For example, in
trilobites the tagmata are the
cephalon (head), thorax (body), and
pygidium (tail), whereas in
hexapods, these same divisions are called
head, thorax, and abdomen. The body of
spiders and some
crustaceans is divided into two tagmata: the
cephalothorax and the
opisthosoma (spiders) or abdomen (crustaceans).
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