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Metamerism
The body is divided into repeated segments.
Tagmatization
Similar body segments are grouped together to form specialized regions.
Parapodia
Paired, fleshy appendages used for movement and sometimes respiration.
Setae
Small, bristle-like structures that help an annelid move and anchor itself.
Cuticle
A thin protective outer covering of the body.
Metanephridium
An excretory organ that removes wastes from the body.
Clitellum
A thickened band around an earthworm that helps form the cocoon during reproduction.
Seminal vesicles
Structures that store and help nourish sperm.
Seminal receptacles
Structures that receive and store sperm from another worm during mating.