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Sea Star

Key definitions

QuestionAnswer
Sea Star Phylum: Echinodermata Deuterostomes Triploblastic Coelom Complete digestive tract radially symmetric
Ossicles hard calcareous plates in body wall
Endoskeleton formed by ossicles and spines interconnected by strands of muscle and connective tissue
Oral Surface surface with the mouth
Mouth surrounded by conspicuous spines
Ambulacral grooves extend from the mouth to the tip of each ray
tube feet fleshy projections arranged in longitudinal rows in each of the ambulacral grooves
Aboral Surface opposite surface
Madreporite small round plate// perforated plate through which water enters into the water vascular system
Water Vascular System locomotory system
Stone Canal short rigid passage form madreporite to ring canal
Ring Canal circular tube around mouth
Radial Canals pass out into the rays along the upper walls of ambulacral grooves
Transverse Canals at regular intervals they pass from the radial canals to the tube feet
Tube Feet ends blindly in a suction disc and has water forced into it from a bulbous vesicle (ampulla)
Ampulla bulbous vesicle
Coelomic Fluid includes amoebocytes// circulation and excretion
Esophagus passageway from mouth to large stomach
Stomach fills a major portion of the central disc
Cardiac Stomach extruded through the mouth to envelop and digest food (near mouth)
Pyloric stomach receives ducts from digestive glands (further up)
Digestive Glands Contribute digestive juices into the stomach
Intestine pyloric stomach--> anus// some absorption//
Gonads testes or ovaries// each of the arms//
Created by: nwmoser
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