The body of members of the Phylum Annelida are round, wormlike animals that have long, segmented bodies. The have a large range in length going from under 1 millimeter to over 3 meters. The segments of an Annelid’s body are separated by internal walls called septa (singular: septum). Body segments of Annelid’s are virtually identical to one another however many are modified to perform special functions. For example, the first few segments in an Annelid’s body are designed to carry one or more pairs of eyes, several pair of antennae and other sense organs. The body of an Annelid can also be divided into 3 sections: the head, the trunk, and the pygidium.
All of the segmented worms are coelomic, which means that most of the organs are stored in fluid-filled body cavity. The coelom supports segmented worms' body structure and prodvides them with movement; this movement is called contraction. Moreover, the amount of fluid in the body cavity affects the muscle funciton of the worms. The segments of an Annelids' bodies are separated by intenal walls called septa. Body segments of these worms are identical to on another. They are invertibrate,which also mean they do not have back bones. The only time the worms are unale to move is when the fluid leaks out from coelom.
All of the segmented worms are coelomic, which means that most of the organs are stored in fluid-filled body cavity. The coelom supports segmented worms' body structure and prodvides them with movement; this movement is called contraction. Moreover, the amount of fluid in the body cavity affects the muscle funciton of the worms. The segments of an Annelids' bodies are separated by intenal walls called septa. Body segments of these worms are identical to on another. They are invertibrate,which also mean they do not have back bones. The only time the worms are unale to move is when the fluid leaks out from coelom.
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