English definition of Chaetopoda

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Definition of chaetopoda

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Chaetopoda (n. pl.) A very extensive order of Annelida, characterized by the presence of lateral setae, or spines, on most or all of the segments. They are divided into two principal groups: Oligochaeta, including the earthworms and allied forms, and Polychaeta, including most of the marine species..

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Annelida :: Annelida (n. pl.) A division of the Articulata, having the body formed of numerous rings or annular segments, and without jointed legs. The principal subdivisions are the Chaetopoda, including the Oligochaeta or earthworms and Polychaeta or marine worms; and the Hirudinea or leeches. See Chaetopoda..

Chaetopod :: Chaetopod (n.) One of the Chaetopoda.

Polychaeta :: Polychaeta (n. pl.) One of the two principal groups of Chaetopoda. It includes those that have prominent parapodia and fascicles of setae. See Illust. under Parapodia.

Elytrum :: Elytrum (n.) One of the shieldlike dorsal scales of certain annelids. See Chaetopoda.

Chaetopoda :: Chaetopoda (n. pl.) A very extensive order of Annelida, characterized by the presence of lateral setae, or spines, on most or all of the segments. They are divided into two principal groups: Oligochaeta, including the earthworms and allied forms, and Polychaeta, including most of the marine species..

Chaetopod :: Chaetopod (a.) Pertaining to the Chaetopoda.

Errantia :: Errantia (n. pl.) A group of chaetopod annelids, including those that are not confined to tubes. See Chaetopoda..

Scaleback :: Scaleback (n.) Any one of numerous species of marine annelids of the family Polynoidae, and allies, which have two rows of scales, or elytra, along the back. See Illust. under Chaetopoda..

Dorsibranchiata :: dorsibranchiata (n. pl.) A division of chaetopod annelids in which the branchiae are along the back, on each side, or on the parapodia. [See Illusts. under Annelida and Chaetopoda.].