phylum_echinodermata_2009_.pdf

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Deuterostomes Blastopore forms anus Coelom formed from outpouching of gut Radial cleavage Echinodermata ( echino = hedgehog, derma = skin) Water vascular system 1. Calcitic endoskeleton of ossicles 2. Pentaradial symmetry in adults 3. Mutable connective tissue 4. Nerve ring and canals 5. No excretory system 6. Marine 7. Classes of Echinodermata Crinoidea Sea lilies & feather stars Mouth upward Ciliated feathery arms Asteroidea Sea stars Usually 5 arms broadly connected to central disc Ophiuroidea Brittlestars & basketstars 5 arms distinct from central disc Echinoidea Sea urchins & sand dollars Ossicles fused into a test Spines & aristotle's lantern Holothuroidea Sea cucumbers Elongated Anterior tube feet modified into tentacles Class Concentricycloidea or "sea daisies" is now under Asteroidea Crinoidea B Samaniego
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