Annelida
from class: Biology for Non-STEM Majors Definition Annelida is a phylum of segmented worms characterized by their ring-like body segments called annuli. They include earthworms, leeches, and marine polychaetes.
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Predict what's on your test 5 Must Know Facts For Your Next Test Annelids have a true coelom that functions as a hydrostatic skeleton. They possess both longitudinal and circular muscles for movement. Annelids exhibit metamerism, meaning their bodies are divided into repeating segments. They have a closed circulatory system with blood vessels. Most annelids have specialized structures called setae or chaetae for locomotion. Review Questions What type of body cavity do annelids possess? How do annelids achieve movement? What is the significance of metamerism in annelids? "Annelida" also found in:
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