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Phylum echinodermata 2012 2013
- 2. Name and Body Symmetry • echino = “bumpy” or “spiny” • derm = “skin” • Echinoderms are radially symmetrical=equal units arranged in a circle around a central disk • Many have five equal units so we can specify that they have pentamerous radial symmetry as adults
- 3. Distribution & Habitat, Reproduction -Found worldwide -Epibenthic, Epifauna -External fertilization -External development -Planktonic larvae (unlike adult they are bilaterally symmetrical)
- 5. Locomotion -Slow moving creatures -Most use tube feet-watch
- 6. 1) Class Ophiuroidea – The Brittle Stars
- 7. 2) Class Echinoidea – Sea Urchins & Sand Dollars Aristotle’s Lantern
- 8. Sea Urchins
- 9. Sand Dollars Watch a sand dollar move
- 10. 3) Class Holothuroidea – Sea Cucumbers Watch a sea cucumber
- 11. 4) Class Crinoidea – Feather Stars & Sea Lilies
- 12. 5) Class Asteroidea – The Sea Stars
- 13. Sea Stars
Notes de l'éditeur
- Unlike sea stars, brittle stars have long, thin arms without suckers on the ends of their tube feet.
- With spines and test alone
- Live in shallow sandy or muddy bottom regions Eat by positioning themselves into current and eat copepods or other zooplankton coming toward them. Once caught in tube feet the plankton are directed to the sand dollar’s mouth http://ronda.la/sandbucks/sand-dollar-faqs.htm
- Tentacles around mouth help take in mud, sand Special protection-can expel organs in a tangled, sticky, toxic mass to scare away predators. Also, can just curl up and roll away.
- Wave sticky arms in current to suspension feed. Usually stay stuck to one spot (hold onto coral or rocks) and just feed from there instead of travelling to find food. Mouth and anus on top (unlike other echinoderms)