1 / 27

Phylum Echinodermata

Phylum Echinodermata. Echinoderms are __________, ________, __________, ________, ____________, _____________ and ____________. Sea stars. sea lilies. sea urchins. feather stars. sea cucumbers. sand dollars. brittle stars.

florencem
Download Presentation

Phylum Echinodermata

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. Phylum Echinodermata • Echinoderms are __________, ________, __________, ________, ____________, _____________ and ____________. Sea stars sea lilies sea urchins feather stars sea cucumbers sand dollars brittle stars * Echinoderm means _______________. All echinoderms have spiny skin. spiny skin

  2. Echinoderms They live in the ocean! • There are ______ characteristics of echinoderms. five • All echinoderms have: • Spiny skin • An internal skeleton (endoskeleton) • Five-part radial symmetry • A water vascular system • Tube feet

  3. Characteristics of Echinoderms * All echinoderms have __________. Some of them have small hair-like spines, like the starfish. spiny skin * Some echinoderms have long spines, like the sea urchin.

  4. Characteristics of Echinoderms * The internal skeleton of an echinoderm is made of _______________________. bony plates that are bumpy or spiny.

  5. Characteristics of Echinoderms * An echinoderm’s water vascular system is _________________________________. a system of tubes that act as circulatory and respiratory systems * The water vascular system also helps an echinoderm _____. move * The system opens to the outside through the sieve like madreporite.

  6. Madreporite • Opening to the outside • Connects to a ring canal around the mouth • 5 radial canal extend up the arms from the ring canal

  7. Characteristics of Echinoderms * Echinoderms have __________. tube feet * An echinoderm’s tube feet are used for _________________________________. moving and for getting food

  8. Characteristics of Echinoderms *Five-part radial symmetry. *They have no anterior or posterior end and lack ______________. cephalization * But the bodies are 2-sided. Mouth side is the oral surface & the opposite side is the aboral surface.

  9. Plan for the Day • Review unifying characteristics of Echinoderms • Examine 5 classes of the Phylum Echinodermata • Check your understanding activity • * Mollusc & Echinoderm test - WEDNESDAY

  10. 5 Classes of Echinoderms • Asteroidea • Echinoidea • Ophiuroidea • Holothuroidea • Crinoidea

  11. Class Asteroidea * A sea star is able to re-grow its arms * Carnivores: use tube feet to move and to open bivalves to eat

  12. ClassEchinoidea Sea urchins & sand dollars * Have solid plates surrounding their internal organs *Most are detritivores or grazers.

  13. Sea Urchins * Sea urchins have longer and sharper ________ that they use to protect themselves. spines * Sea urchins have a mouth hidden under its body and they eat sea algae (kelp). * A sea urchin is not very active. Sometimes, it does move slowly using its __________. When not moving it uses its feet to stick to the ocean floor. tube feet

  14. ClassOphiuroidea Brittle Stars * Have slim, flexible arms, and can move quickly. Can detach an arm if being attacked! * Filter feeders and detritivores that come out at night

  15. ClassHolothuroidea Sea cucumbers * Feed on detritus * Can expel all their internal organs as a decoy if being attacked!

  16. ClassCrinoidea Sea lilies & feather stars * Oldest echinoderms * Filter feeders: attach to the seafloor by a stock and use their tube feet to catch prey

  17. Echinoderms: Form & Function Feeding Respiration Circulation Excretion Response Movement Reproduction

  18. Feeding Sea urchins: five-part jaw to eat algae Sea lilies: tube-feet to trap plankton Sea cucumbers: eat sand & detritus on the ocean floor or filterfeed Sea stars: tube-feet to pry open mollusks shells. Evert their stomach into the mollusk shell and secretes digestive enzymes. Brings stomach and digested food back inside. (digests externally)

  19. Respiration & Circulation • **Water vascular system** - primary system • Carries oxygen, food and wastes *Tube-feet allow some diffusion through thin walls for respiration (gas exchange) *Skin gills are present in some echinoderms for gas exchange *Sea cucumber: pumps water in and out of its anus to provide oxygen to its respiratory trees

  20. Excretion Nitrogen-containing wastes are excreted through thin-walled tube feet Digestive wastes (feces) are released through the anus

  21. Response Primitive nervous system (no brain) Nerve ring surrounding the mouth connects to radial nerves to the body segments Senses: to detect light, gravity and chemicals

  22. Movement Tube feet ! – All use tube feet to move (water-vascular system) - hydraulics Sand dollars & sea urchins move their spines Sea stars & brittle stars move arms because of flexible joints Sea cucumbers move using muscular wall & tube feet

  23. Reproduction • External fertilization • Eggs produced in ovaries & sperm produced in testes • Gametes released into the water for fertilization • Larvae are free swimming

  24. Reproduction Regeneration Sea stars can regenerate: must contain part of the centre ring

  25. Echinoderm Ecology Urchin Barren: created by overpopulation of urchins Sea stars are predators and help control the growth of mollusks (mussels) & corals

  26. Echinoderm Ecology Threat to coral reefs: sea star called crown-of-thorns Feeds on coral and has destroyed coral reefs in Australia

  27. Review Questions .

More Related