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Segmented worms (Annelida) are a group of invertebrates that includes about 12,000 species of earthworms, ragworms and leeches. Segmented worms live in marine habitats such as the intertidal zone and near hydrothermal vents.egmented worms are divided into the following taxonomic groups: 1  Polychates-The polychaetes include about 12,000 species that are characterized by having multiple hairs on each segment. 2  They have nuchal organs on their neck that function as chemosensory organs.
Segmentation. As the lab manual explains, segmentation is the characteristic that the body is divided into repetitive segments arranged on a longitudinal axis. Each segment contains parts of the circulatory, digestive, nervous, and excretory systems.Annelids are among the earliest organisms to appear with a segmented body plan.Other organisms also have a segmented body plan. Arthropods, such as insects, show a strong degree of segmentation with a head thorax and abdomen with specific functions.Echinoderms, such as starfish, are also segmented, but their segmentation is not along a longitudinal axis because of their radial symmetry.ther organisms also have a segmented body plan. Arthropods, such as insects, show a strong degree of segmentation with a head thorax and abdomen with specific functions. Echinoderms, such as starfish, are also segmented, but their segmentation is not along a longitudinal axis because of their radial symmetry.