1 / 19

Echinoderms

Echinoderms. Section 29.1. Animal Classification. Sponges Cnidarians Worms Mollusks Arthropods Enchinoderms. Invertebrates. Echinoderms. Animals. Fishes Amphibians Reptiles. Ectotherms (cold-blooded). Vertebrates. Birds Mammals. Endotherms (warm-blooded).

tybalt
Télécharger la présentation

Echinoderms

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Echinoderms Section 29.1

  2. Animal Classification Sponges Cnidarians Worms Mollusks Arthropods Enchinoderms Invertebrates Echinoderms Animals Fishes Amphibians Reptiles Ectotherms (cold-blooded) Vertebrates Birds Mammals Endotherms (warm-blooded)

  3. What is an Echinoderm? • Echinoderm (Greek word) • “echinos” – spiny • “derma” – skin • Rays – long, tapering arms that are covered with short, rounded spines

  4. What is an Echinoderm? • Pedicellariae (PEH dih sih LAHR ee ee) – modified spines into pincerlike appendages • Echinoderms have radial symmetry

  5. Water Vascular System • Water vascular system – a hydraulic system that operates under water pressure • Water enters and leaves the water vascular system of a sea star through the madreporite

  6. Water Vascular System • Madreporite (mah druh POHR ite) – a sievelike, disk-shaped opening on the upper surface of an echinoderm’s body

  7. Water Vascular System • Tube feet – hollow, thin-walled tubes that end in a suction cup • Tube feet look somewhat like miniature droppers

  8. Water Vascular System • Ampulla – the round, muscular structure works like the bulb of a dropper • Tube feet also function in gas exchange and excretion

  9. Varied Nutrition • Sea stars are carnivorous and prey on worms and clams • Brittle stars and sea cucumbers feed on dead and decaying matter that drifts down to the ocean floor

  10. Simple Nervous System • Echinoderms have no head or brain, but they do have a central nerve ring • Each radial nerve branches into a nerve net that provides sensory information to the animal

  11. Simple Nervous System • Sea stars have eyespots located at the tip of each arm

  12. Diversity of Echinoderms • Sea stars • Most species of sea stars have five rays, but some can have up to 40 rays http://www.youtube.com/watch?v=A100m5EpfFI

  13. Sea Stars

  14. Diversity of Echinoderms • Brittle stars • Brittle stars are extremely fragile • This adaptation helps the brittle star to distract a predator

  15. Sea urchins Globe-shaped Do not have rays Look like pin cushions Sand dollars Disk-shaped Do not have rays A living sand dollar is covered with hair-like spines Diversity of Echinoderms http://www.youtube.com/watch?v=3uwOURjneWQ

  16. Sand Dollars

  17. Diversity of Echinoderms • Sea cucumbers • When threatened, they may expel their organs (intestines) through the anus • The organs may rupture and is regenerated in a few weeks http://www.youtube.com/watch?v=wXf_YodWw40

  18. Sea Cucumbers

More Related