Phylum Annelida - outline summary PDF

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Summary

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Description

true coelom present

Phylum Annelida (segmented worms, bristle worms)

mesoderm on inside of body wall and outside of digestive system

15,000 species

layers of muscles inside body wall and on outside of digestive tract

large successful phylum in water & on land include earthworms, sand worms, bristle worms, clam worms, fan worms, leeches

with head-body-pygidium some with bizzare forms

worldwide distribution:

head (prostomium & peristomium) marine, brackish, freshwater and terrestrial most annelids show some degree of cephalization with a distinct head (=prostomium)

Body Form elongated wormlike body

tentacles, palps and sensory structures...