Phylum Echinodermata

Phylum Echinodermata - -ability to “swim” Asteroids sea...

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Phylum Echinodermata: sea stars, urchin, brittle stars, sea cucumbers, basket stars, feather stars, sea lilies -radial symmetry, pentaradia l, no brain - water vascular system: locomotion -photosensors -primitive nervous system -deuterostome: endoskeleton: calcareous oscicles and spine -oral (mouth side), aboral (other side) -sexual reproduction, release of sperm and egg -eat coral – decimation Crinoidea: sea lilies and feather stars -deep water -eat plankton -feathery arms
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Unformatted text preview: -ability to “swim” Asteroids: sea stars-predatory, # of arms in multiple of 5s-stomach inversion-digestive tract runs down each “arm”-gonads in one “arm” Opheroids: brittle/basket stars-tiny disc “body”-water vascular system in arms-pent 5 jaws-clean algae off sand to eat Echinoidea: sea urchins-herbivorous-armless, emphasize of center-test: skeleton-jaws-egg used as delicacy Holothurians: sea cucumbers-hydrostatic skeleton-tentacles...
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