segmentation--the annelid worms - part 5 of 28. describes the structure and functions of the segmented worm body systems, and shows that the segmented annelid worm body plan represents an important evolutionary development. the major classes of the phylum - brain segmented stock videos & royalty-free footage00:27Segmentation--The Annelid Worms - part 5 of 28. Describes the structure and functions of the segmented worm body systems, and shows that the segmented annelid worm body plan represents an important evolutionary development. The major classes of the phylumWorm