Phylum Echinodermata “Spiny – skin”

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Phylum Echinodermata.

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Presentation transcript:

Phylum Echinodermata “Spiny – skin” Radially symmetrical (Penta - 5 parts) Complete digestive tract, coelom, and an internal skeleton (endoskeleton)

Water – vascular system Tube feet Ampullae (muscular sac) Madreporite (sieve plate) Bilaterally symmetrical larvae bipinnaria Deuterostomes Coelomates Blastopore develops into anus

Types of Echinoderms Class Asteriodea (sea stars) Class Ophiuroidea (brittle stars) Class Echinoidea (sea urchins and sand dollars) Class Holothuroidea (sea cucumbers) Class Crinoidea (feather stars and sea lilies)

Biology of Echinoderms Feeding and Digestion Cardiac stomach (invert into prey) Pyloric stomach (digestive glands) Nutrients transported by coelomic fluid Nervous system Little known about nervous system Reminiscent of nerve net Nerve ring and radial nerve

Biology of Echinoderms No circulatory, excretory, respiratory organ systems Reproduction Separate sexes External fertilization Regeneration