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Annelids, like mollusks, are among the first creatures to develop a coelom. A coelom is a mesodermal tissue-lined fluid-filled bodily cavity.
The phylum Annelida is cephalized. While it may not be visible, this phylum's segmented worms have a well-developed brain and nervous system, which is aided in part by their bilateral symmetry.
A pseudocoelom is a body cavity that is located between mesodermal and endodermal tissue and is not completely surrounded by mesodermal tissue. A "true" coelom is surrounded entirely by mesodermal tissue and can thus be divided into compartments.
Several groups of segmented worms, including worms found in mud and sand, earthworms, and leeches, are members of the phylum Annelida. Bilateral symmetry, cephalization, an open digestive system, segmentation, and a body cavity are all features of segmented worms.
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