Coeloblast see hypoblast

coeloblastula n.; pl. -lae [Gr. koilos, hollow; blastos, bud] 1. A hollow blastula; a blastula without qualification. 2. (PO-RIF: Calcarea) The simple type of blastula larva found in Calcinia .

coeloconoid a. [Gr. koilos, hollow; konos, cone; eidos, form] Approaching conical but with concave sides; extraconic. see conoid, cyrtoconoid.

coelogastrula n. [Gr. koilos, hollow; gaster, stomach] A gas-trula derived from a coeloblastula.

coelom n. [Gr. koilos, hollow] The body cavity or space between the body wall and internal organs lined with meso-derm in many metazoan animals.

Coelomata n. [Gr. koilos, hollow] In some classifications, a taxonomic group comprising those metazoans that have a coelom or body cavity formed in and surrounded by meso-derm at some stage in their life cycle.

coelomate a. [Gr. koilos, hollow] Having a coelom or body cavity.

coelomesoblast n. [Gr. koilos, hollow; mesos, middle; blastos, bud] In segmentation, the mesoblastic bands that will form the wall of the coelom and outgrowths.

coelomic canals and sacs (SIPUN) Dermal canals, spaces or diverticula containing coelomic fluid connected with the body cavity through small pores; possibly aiding respiration.

coelomic cavity That area between the viscera and the body wall.

coelomic funnel The nephrostome.

coelomic papillae (SIPUN) Small, flat, leaf-like processes on the coelomic surface of the body wall, usually anterior of the nephridial attachment.

coelomic sacs Cavities representing the coelom that appear in the mesoderm in embryology.

coelomocytes [Gr. koilos, hollow; kytos, container] 1. Corpuscles (usually amoebocytes) in the coelomic or pseu-docoelomic fluids of invertebrates. 2. (ANN) amoebocytes and elaeocytes. 3. (ECHINOD) The spindle-shaped cells, phagocytes, and crystal cells. 4. (NEMATA) The mesenchy-matous cells in the body cavity. see pseudocoel cells, pseudocoelomocytes.

coelomoduct n. [Gr. koilos, hollow; L. ducere, to lead] Any duct that connects the coelom to the external surface of the body, usually applied to the terminal tubule of nephridia; in onchophorans and mollusks, excretory and/or reproductive functions.

coelomopores [Gr. koilos, hollow; poros, passage] 1. (BRYO) A body wall pore connecting the coelom with the exterior; the pore at the base of the tentacles through which the ova are extruded; supraneural pore. 2. (MOLL: Cephalopoda) Nautiloid ducts between the pericardial cavity and the exterior.

coelomostome n. [Gr. koilos, hollow; stoma, mouth] The external opening of a coelomoduct.

coelomyarian n. [Gr. koilos, hollow; mys, muscle] (NEMATA) Muscle structure in which the contractile fibrils are not only next to the subcuticula, but also extend varying distances up the side of the muscle cell and partially enclose the sar-coplasm. see platymyarian, circomyarian.

coelozoic a. [Gr. koilos, hollow; zoon, animal] Living in the lumen of a hollow organ, i.e., the intestine.

coenenchyma, coenenchyme n.; pl. coenenchymata [Gr. koinos, common; enchyma, infusion] (CNID: Anthozoa) Thick cellular mesoglea connecting adjacent polyps of al-cyonarian corals. coenenchymal a.

coenobiosis n. [Gr. koinos, common; biosis, manner of life] A consociation of plants and animals of different species.

coenoblast n. [Gr. koinos, common; blastos, bud] Embryonic germ layer originating both in the endoderm and meso-derm.

coenocyte n. [Gr. koinos, common; kytos, container] A multi-nucleate condition of discrete cells resulting from repeated nuclear division unaccompanied by cell fission; giant cell.

coenoecium n. [Gr. koinos, common; oikos, house] (BRYO) The common secreted investment of a colony, gelatinous, chitinous, or calcareous.

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