Cnida cnidae pl see nematocyst

Cnidaria, cnidarian n. [Gr. knide, nettle] 1. A phylum of primitive eumetazoans, including the hydras, jellyfish, sea anemones and corals, each bearing nematocysts. 2. In some classifications considered a subphylum of Coelenter-ata. 3. Sometimes considered synonymous with Coelenter-ata.

cnidoblast, nematoblast, nematocyte n. [Gr. knide, nettle; blastos, bud] (CNID) A round or ovoid interstitial cell that forms a nematocyst.

cnidocil n. [Gr. knide, nettle; L. cilium, eyelid] (CNID) A small pointed projection on a nematocyst that acts as a trigger during discharge.

cnidocyst n. [Gr. knide, nettle; kystis, bladder] (CNID) A rigid oval capsule containing the eversible thread in the cnido-blast.

cnidophore n. [Gr. knide, nettle; phorein, to bear] (CNID) A contractile stalk with an enlarged hollow tip bearing nematocysts; present on the tentacles of some medusae.

cnidopod n. [Gr. knide, nettle; pous, foot] (CNID) The basal portion of a nematocyst.

cnidorhagi n. [Gr. knide, nettle; rhax, grape] (CNID) Clusters of rounded projections of tube anemones that are filled with nematocysts.

cnidosac, cnidus sac n. [Gr. knide, nettle; sakkos, bag] (MOLL: Gastropoda) Cells in the distal tip of the cerata in which undischarged nematocysts ingested from cnidarians are stored and later used for defense.

coacervate a. [L. coacervare, to heap up] Piled up; collected into a crowd; densely clustered.

coactus a. [L. coactus, compress] Pertaining to a short stout form; condensed.

coadaptation n. [L. cum, with; ad, to; aptus, to fit] The selection process that tends to accumulate harmonious interactions of genes brought together by natural selection.

coadunate a. [L. coadunare, to unite with] 1. Combined or joined together. 2. (ARTHRO: Insecta) Elytra when permanently united at the suture.

coagulation n. [L. coagulare, to curdle] The formation of a clot; to change from a liquid to a viscous or solid state.

coagulin n. [L. coagulare, to curdle] A constituent of blood that aids in coagulation.

coagulocyte n. [L. coagulare, to curdle; Gr. kytos, container] (ARTHRO) Specialized granular hemocytes. see cystocytes.

coagulum n. [L. coagulare, to curdle] A semisolid mass; a clot; curd.

coalesce v.i. [L. coalitus, united] To come together into one; to fuse or blend.

coalescent a. [L. coalitus, united] A growing together, uniting.

coalite v.i. [L. coalitus, united] To unite or associate.

coalite stilt prolegs (ARTHRO: Insecta) Having a portion of the prolegs united into one organ for a part of their length, with a bifid apex.

coarctate a. [L. coarctatus, compressed] 1. Crowded together; compressed; contracted. 2. (ARTHRO: Insecta) Having the abdomen separated from the thorax by a constriction.

coarctate larva (ARTHRO: Insecta) 1. A larva similar to the dipteran puparium in which the skin of the preceding instar is not completely shed, being attached to the caudal end of the body. 2. The sixth instar of a meloid larva with the fifth exuvium present; a pseudopupa; a semipupa.

coarctate pupa (ARTHRO: Insecta) A type of pupa in certain Diptera, with the last larval skin being retained as a protective puparium, with tracheal connection maintaining contact between the pupa within the larval skin with the outside.

cocardes [F. cocarde, insignia] (ARTHRO: Insecta) Lateral protrusible vesicles at the sides of the thorax and abdomen of Malachiidae beetles.

coccinellin n. [Gr. kokkinos, scarlet] (ARTHRO: Insecta) A defensive secretion (C 13H23 NO), of the ladybug beetle Coc-cinella septempunctate, that has a bitter taste and smell that repels the ant Myrmica rubra.

coccineous a. [Gr. kokkinos, scarlet] Cochineal red; scarlet.

cocephalic a. [L. cum, together; Gr. kephale, head] (ARTHRO: Insecta) Having a prognathous head in which only the foramen exists.

cochineal n. [Gr. kokkinos, scarlet] (ARTHRO: Insecta) A crimson dye commercially extracted from the dried bodies of the homopterous insect Dactylopius coccus (cochineal scale) cultivated in South America, Mexico and the Canary Islands. see quinone biochrome.

cochleate a. [Gr. kochlias, snail with a spiral shell] Spirally twisted like a snail shell; screw-like.

cockle n. [Gr. konkylion, shell] (MOLL: Bivalvia) The heart-shaped shells or valves of the family Cariidae .

cocoon n. [F. cocon, shell] A protective case or covering of an egg mass, larva, pupa, or adult of various invertebrates.

cocoon-breaker or cutter (ARTHRO: Insecta) Structures or an elevated ridge of the pupa of certain Lepidoptera, often on the meson of the head; functioning in exiting the cocoon.

code n. [L. codex, tablet] The International Code of Zoological Nomenclature.

codominant a. [L. cum, with; dominus, master] Pertaining to genes when both alleles of a pair are fully expressed in the heterozygote.

codon n. [L. codex, tablet] The genetic unit of three adjacent nucleotides that specify a single amino acid in a polypep-tide chain.

codonocephalus larva (PLATY: Trematoda) A metacercaria similar to a neascus larva.

coe- For words not found here see ce- or cae-.

coecum, coeca see caecum

Coelenterata, coelenterate n. [Gr. koilos, hollow; enteron, intestine] 1. A group of diploblastic, mostly marine animals with a single internal cavity with an oral opening. 2. Cni-daria (=Coelenterata). 3. A phylum containing two sub-phyla, Cnidaria and Ctenophora in some classifications.

coelenteron n. [Gr. koilos, hollow; enteron, intestine] The single cavity, or sole body space of a coelenterate, serving as a stomach and excretory organ, and by outgrowths, as a primitive vascular system.

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