AP BIOLOGY

Detailed explanation-1: -annelid, phylum name Annelida, also called segmented worm, any member of a phylum of invertebrate animals that are characterized by the possession of a body cavity (or coelom), movable bristles (or setae), and a body divided into segments by transverse rings, or annulations, from which they take their name.

Detailed explanation-2: -Annelids are often called “segmented worms” because they possess true segmentation of their bodies, with both internal and external morphological features repeated in each body segment.

Detailed explanation-3: -The annelids include earthworms, polychaete worms, and leeches. All members of the group are to some extent segmented, in other words, made up of segments that are formed by subdivisions that partially transect the body cavity. Segmentation is also called metamerism.

Detailed explanation-4: -Following are the different classification of Annelida: Polychaeta. Oligochaeta.

Detailed explanation-5: -Annelids are segmented worms with a tubular body and a specialized digestive system with a terminal mouth and an anus. Their body cavity has thin transverse septa that delineate the segments. They generally reproduce sexually by cross-fertilization and are often hermaphroditic, but many reproduce asexually by budding.