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Chapter 33

Chapter 33. Invertebrates. Invertebrates. Lack a backbone Account for 95% of all known animal species. All but one of the 35 animal phyla. Porifera. Sponges are sedentary suspension feeders. They pass water through their pores and extract food. They are sessile. Radial Symmetry.

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Chapter 33

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  1. Chapter 33 Invertebrates

  2. Invertebrates • Lack a backbone • Account for 95% of all known animal species. • All but one of the 35 animal phyla.

  3. Porifera • Sponges are sedentary suspension feeders. • They pass water through their pores and extract food. • They are sessile.

  4. Radial Symmetry • Cnidarians are invertebrates such as jellyfish, corals, and hydras. • Many inverts have radial symmetry.

  5. Bilateral Symmetry • Most animals are bilaterally symmetrical, and have triploblastic development. • Platyhelminthes flatworms

  6. Rotifera • Tiny animals inhabiting fresh water, marine, and damp soil. • Unique because many of them reproduce via parthenogenesis.

  7. Parthogenesis • Females produce offspring from unfertilized eggs.

  8. Parthogenesis • Some species of rotifers produce two types of eggs. • One develops into a female, the other into a short-lived male. • The male survives long enough to produce sperm that fertilize the eggs.

  9. Parthogenesis • Some rotifers produce females. • These females lay more unfertilized eggs that develop into more females.

  10. Mollusca • Have a muscular foot. • A visceral mass containing internal organs. • A mantle, a tissue that secretes a shell.

  11. Annelida • Segmented worms.

  12. Arthropoda • 2/3’s of all known species. • They have a hard exoskeleton and jointed appendages.

  13. Echinoderms and Chordata • Echinoderms are spiny skinned animals such as sea stars and sea urchins. • Chordata are the subphyla of invertebrates that contain a notochord but no vertebra.

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