coelomic sacs
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coelomic canals and sacs — (SIPUNCULA) Dermal canals, spaces or diverticula containing coelomic fluid connected with the body cavity through small pores; possibly aiding respiration … Dictionary of invertebrate zoology
axocoel — n. [Gr. axon, axle; koilos, hollow] (ECHINODERMATA) The first pair of coelomic sacs in an embryo, that open to the surface by the hydropore … Dictionary of invertebrate zoology
somatocoel — n. [Gr. soma, body; koilos, hollow] (ECHINODERMATA) The posterior of the three regions of coelomic sacs of the embryonic coelom, anterior (axocoel), and middle (hydrocoel) … Dictionary of invertebrate zoology
animal development — Introduction the processes that lead eventually to the formation of a new animal starting from cells derived from one or more parent individuals. Development thus occurs following the process by which a new generation of organisms is produced by … Universalium
reproductive system, animal — Introduction any of the organ systems by which animals reproduce. The role of reproduction is to provide for the continued existence of a species; it is the process by which living organisms duplicate themselves. Animals compete with… … Universalium
respiration — respirational, adj. /res peuh ray sheuhn/, n. 1. the act of respiring; inhalation and exhalation of air; breathing. 2. Biol. a. the sum total of the physical and chemical processes in an organism by which oxygen is conveyed to tissues and cells,… … Universalium
spoonworm — /spoohn werrm /, n. any of various unsegmented, burrowing marine worms of the phylum Echiura, of shallow waters worldwide, having a sausage shaped body and a flattened head. [1835 45; SPOON + WORM] * * * ▪ invertebrate Introduction also called… … Universalium
Catfish — For other uses, see Catfish (disambiguation). Catfish Temporal range: Late Cretaceous – present Black bullhead Scientific classificati … Wikipedia
