NEET 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: -Annelid Segmentation The Annelida body plan contains three main body regions: 1) the prostomium, or the head, 2) the trunk, or main body, and 3) the pygidium, the anus. The prostomium is located at the most anterior (forward) region of the worm containing most of the sensory organs.