Also found in: Dictionary, Thesaurus, Medical, Wikipedia.


(invertebrate zoology)
One of the short, paired processes on the sides of the body segments in certain annelids.
A lateral expansion of the foot in gastropod mollusks.



one of the lateral processes on the body of polychaetous worms. The parapodia are borne in pairs by each trunk segment and serve primarily as locomotive organs. Parapodia typically consist of a ventral and a dorsal branch. Each branch is equipped with a cluster of bristles and with a tactile antenna, which at times is modified into a gill.

References in periodicals archive ?
Diagnosis: Bidentate pseudospinigers are present and there are 3 aciculae per parapodium including a needle-like acicula.
Now more patients will be able to take advantage of the Parapodium, after one was donated to Middlesbrough's James Cook University Hospital.
The number of setigerous segments is always 16; setigers 1-3 only have notosetae; setigers 4-15 have uncini and notosetae, aud setiger 16 only notosetae; the last segment bears a reduced parapodium which lacks setae.
However, he did not indicate the origin of the illustrated parapodium.