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Antenna :: Antenna (n.) A movable, articulated organ of sensation, attached to the heads of insects and Crustacea. There are two in the former, and usually four in the latter. They are used as organs of touch, and in some species of Crustacea the cavity of the ear is situated near the basal joint. In insects, they are popularly called horns, and also feelers. The term in also applied to similar organs on the heads of other arthropods and of annelids..

Gastrotrocha :: Gastrotrocha (n.) A form of annelid larva having cilia on the ventral side.

Strobile :: Strobilation (n.) The act or phenomenon of spontaneously dividing transversely, as do certain species of annelids and helminths; transverse fission. See Illust. under Syllidian..

Lithophagous :: Lithophagous (a.) Eating or destroying stone; -- applied to various animals which make burrows in stone, as many bivalve mollusks, certain sponges, annelids, and sea urchins. See Lithodomus..

Ditokous :: Ditokous (a.) Having two kinds of young, as certain annelids..

Spermatophore :: Spermatophore (n.) A capsule or pocket inclosing a number of spermatozoa. They are present in many annelids, brachiopods, mollusks, and crustaceans. In cephalopods the structure of the capsule is very complex..

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

Tubivalve :: Tubivalve (n.) A shell or tube formed by an annelid, as a serpula..

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

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

Conodont :: Conodont (n.) A peculiar toothlike fossil of many forms, found especially in carboniferous rocks. Such fossils are supposed by some to be the teeth of marsipobranch fishes, but they are probably the jaws of annelids..

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..

Ligula :: Ligula (n.) A tongue-shaped lobe of the parapodia of annelids. See Parapodium.

Palpus :: Palpus (n.) A feeler; especially, one of the jointed sense organs attached to the mouth organs of insects, arachnids, crustaceans, and annelids; as, the mandibular palpi, maxillary palpi, and labial palpi. The palpi of male spiders serve as sexual organs. Called also palp. See Illust. of Arthrogastra and Orthoptera..

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

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..

Scale :: Scale (n.) One of the small scalelike structures covering parts of some invertebrates, as those on the wings of Lepidoptera and on the body of Thysanura; the elytra of certain annelids. See Lepidoptera..

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

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

Telotrochous :: Telotrochous (a.) Having both a preoral and a posterior band of cilla; -- applied to the larvae of certain annelids.

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