segmentation--the annelid worms - part 18 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 phylu - 18 segmented stock videos & royalty-free footage00:31Segmentation--The Annelid Worms - part 18 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 phylu