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Cephalotrocha :: Cephalotrocha (n.) A kind of annelid larva with a circle of cilia around the head.

Septum :: Septum (n.) One of the transverse partitions dividing the body cavity of an annelid.

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

Anneloid :: Anneloid (n.) An animal resembling an annelid.

Tubeworm :: Tubeworm (n.) Any annelid which constructs a tube; one of the Tubicolae.

Nereidian :: Nereidian (n.) Any annelid resembling Nereis, or of the family Lycoridae or allied families..

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.].

Amphitrocha :: Amphitrocha (n.) A kind of annelid larva having both a dorsal and a ventral circle of special cilia.

Aphrodite :: Aphrodite (n.) A large marine annelid, covered with long, lustrous, golden, hairlike setae; the sea mouse..

Hypoderma :: Hypoderma (n.) An inner cellular layer which lies beneath the chitinous cuticle of arthropods, annelids, and some other invertebrates..

Serpula :: Serpula (n.) Any one of numerous species of tubicolous annelids of the genus Serpula and allied genera of the family Serpulidae. They secrete a calcareous tube, which is usually irregularly contorted, but is sometimes spirally coiled. The worm has a wreath of plumelike and often bright-colored gills around its head, and usually an operculum to close the aperture of its tube when it retracts..

Nereites :: Nereites (n. pl.) Fossil tracks of annelids.

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

Vermes :: Vermes (n. pl.) An extensive artificial division of the animal kingdom, including the parasitic worms, or helminths, together with the nemerteans, annelids, and allied groups. By some writers the branchiopods, the bryzoans, and the tunicates are also included. The name was used in a still wider sense by Linnaeus and his followers..

Anarthropoda :: Anarthropoda (n. pl.) One of the divisions of Articulata in which there are no jointed legs, as the annelids; -- opposed to Arthropoda..

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..

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

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..

Setigerous :: Setigerous (a.) Covered with bristles; having or bearing a seta or setae; setiferous; as, setigerous glands; a setigerous segment of an annelid; specifically (Bot.), tipped with a bristle..

Lumbricus :: Lumbricus (n.) A genus of annelids, belonging to the Oligochaeta, and including the common earthworms. See Earthworm..

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