circum-oral canal
circum-oral canal (ring canal) Part of the water-vascular system in echinoderms (Echinodermata). The madreporite allows water into a canal that feeds the circum-oral canal, located close to the upper surface of Aristotle's lantern. Five radial water vessels extend from the circum-oral canal up the centre of each ambulacrum and from these vessels the tube-feet, used in locomotion and respiration, occur at intervals.
More From encyclopedia.com
Water Beetle , water beetle Aquatic beetle. Whirligig beetles (family Gyrinidae) skim around the surface of water, feeding on small insects. Water scavenger beetles… Water storage , water storage See WATER INVENTORY.
water storage See water inventory. Groundwater , Many of Earth's groundwater supplies are threatened, mainly by human population growth and contamination. Groundwater is freshwater that resides unde… Artificial Recharge , Artificial Recharge
Water-supply development is challenging. Increasing demands for water joined with concerns for environmental protection require a… Water , Water
Background
Water is a chemical compound needed by most plants and animals on Earth in order to sustain life. Pure water is a tasteless, odorles… Water Bug , water bug, name for a large number of water-living bugs, comprising several families of the order Hemiptera (true bugs). All have jointed, sharp, suc…
You Might Also Like
NEARBY TERMS
circum-oral canal