Zoology 10th Edition by Stephen Miller,John Harley

Exercise 5

Members of the phylum Annelida are the segmented worms. They are lophotrocozoans and thus share ancestry with the molluscs, nemerteans, rotifers, and others. Annelid bodies are metameric. Metamerism results in separate hydrostatic compartments, reduces the impact of injury, and permits tagmatization.
How has evidence from molecular biology forced the reevaluation of classification of the Annelida?