In invertebrate biology, a tagma (plural tagmata) is a specialized grouping of arthropodan segments, such as head, body, and tail. Invertebrate is a term coined by Jean-Baptiste Lamarck to describe any animal without a spinal column. ... Biology is the branch of science dealing with the study of life. ... Subphyla and Classes Subphylum Trilobitomorpha Trilobita - trilobites (extinct) Subphylum Chelicerata Arachnida - spiders,scorpions, etc. ... Morphogenesis (from the Greek morphê shape and genesis creation) is one of three fundamental aspects of developmental biology along with the control of cell growth and cellular differentiation. ...

The arthropodan body is divided into numerous segments, also called somites or metameres, that are primarily alike. These segments are grouped into specialized divisions called tagmata. The segments of a tagma may either be fused or moveable.

Tagma divisions vary among superclasses. For example, in trilobites the tagmata are the cephalon (head), thorax (body), and pygidium (tail). However, in hexapods, these same divisions are called head (head), thorax (body), and abdomen (tail). Orders Agnostida Redlichiida Corynexochida Lichida Phacopida Proetida Asaphida Harpetida Ptychopariida doubtful order Nektaspida Trilobites are extinct arthropods in the class Trilobita. ... The cephalon is the foremost portion of the segmented body of a trilobite. ... Diagram of a tsetse fly, showing the head, thorax and abdomen The thorax is a division of an animals body that lies between the head and the abdomen. ... The pygidium is the posterior body part or shield of crustaceans, some insects, and trilobites. ... For six-legged insects, see Hexapoda A Hexapod is a platform for machinery that can be spatially displaced with six degrees of freedom under computer control by individually shortening or lengthening six (=greek hex) struts. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Diagram of a tsetse fly, showing the head, thorax and abdomen The thorax is a division of an animals body that lies between the head and the abdomen. ... The abdomen is a part of the body. ...

The evolutionary process which creates tagmata by fusing and modifying segments is called tagmosis. The evolutionary process of fusing and modifying segments in metameric segmented organisms such as arthropds. ...