The correct answer is: arthropoda.
Arthropoda are invertebrate animals and represent the largest phylum in the animal kingdom (insects and spiders for example). One of their main characteristics is segmentation, the division of some animal body into a series segments which repeat. Arthropods have grouped segments into tagmata which are functionally and morphologically specialized units. Segmentation in insects includes the head, the thorax, and the abdomen, while in spiders there are only two parts, cephalothorax, and abdomen.
