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Atrocha :: Atrocha (n.) A kind of chaetopod larva in which no circles of cilia are developed.

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

Uncinata :: Uncinata (n. pl.) A division of marine chaetopod annelids which are furnished with uncini, as the serpulas and sabellas..

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..

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.

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

Setiger :: Setiger (n.) An annelid having setae; a chaetopod.

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.].

Nereis :: Nereis (n.) A genus, including numerous species, of marine chaetopod annelids, having a well-formed head, with two pairs of eyes, antennae, four pairs of tentacles, and a protrusile pharynx, armed with a pair of hooked jaws..

Naid :: Naid (n.) Any one of numerous species of small, fresh-water, chaetopod annelids of the tribe Naidina. They belong to the Oligochaeta..

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

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..

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