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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..

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

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

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..

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

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

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..

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..

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.].

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

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..

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..

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

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

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

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

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

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