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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..

Spirable :: Spiodea (n. pl.) An extensive division of marine Annelida, including those that are without oral tentacles or cirri, and have the gills, when present, mostly arranged along the sides of the body. They generally live in burrows or tubes..

Echiuroidea :: Echiuroidea (n. pl.) A division of Annelida which includes the genus Echiurus and allies. They are often classed among the Gephyrea, and called the armed Gephyreans..

Annelid :: Annelid (a.) Alt. of Annelida.

Annellata :: Annellata (n. pl.) See Annelida.

Gymnocopa :: Gymnocopa (n. pl.) A group of transparent, free-swimming Annelida, having setae only in the cephalic appendages..

Hirudinea :: Hirudinea (n. pl.) An order of Annelida, including the leeches; -- called also Hirudinei..

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.].

Annulata :: Annulata (n. pl.) A class of articulate animals, nearly equivalent to Annelida, including the marine annelids, earthworms, Gephyrea, Gymnotoma, leeches, etc. See Annelida..

Polygordius :: Polygordius (n.) A genus of marine annelids, believed to be an ancient or ancestral type. It is remarkable for its simplicity of structure and want of parapodia. It is the type of the order Archiannelida, or Gymnotoma. See Loeven's larva..

Cirrus :: Cirrus (n.) The jointed, leglike organs of Cirripedia. See Annelida, and Polychaeta..

Annelidan :: Annelidan (a.) Of or pertaining to the Annelida.

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..

Archiannelida :: Archiannelida (n. pl.) A group of Annelida remarkable for having no external segments or distinct ventral nerve ganglions.

Oligochaeta :: Oligochaeta (n. pl.) An order of Annelida which includes the earthworms and related species.

Annelidan :: Annelidan (n.) One of the Annelida.

Gephyrea :: Gephyrea (n. pl.) An order of marine Annelida, in which the body is imperfectly, or not at all, annulated externally, and is mostly without setae..

Cirrus :: Cirrus (n.) A soft tactile appendage of the mantle of many Mollusca, and of the parapodia of Annelida. Those near the head of annelids are Tentacular cirri; those of the last segment are caudal cirri..

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