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Sponges & Cnidarian Chapter 35. Sponges Invertebrates - animals without back bones. Invertebrates - animals without back bones. Simplest of the multicellular.

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Presentation on theme: "Sponges & Cnidarian Chapter 35. Sponges Invertebrates - animals without back bones. Invertebrates - animals without back bones. Simplest of the multicellular."— Presentation transcript:

1 Sponges & Cnidarian Chapter 35

2 Sponges Invertebrates - animals without back bones. Invertebrates - animals without back bones. Simplest of the multicellular animals. Simplest of the multicellular animals. No organ system. No organ system. Kingdom: animalia Kingdom: animalia Phylum: porifera Phylum: porifera

3 Movement Holdfast - root-like - attach the sponge to rocks. Holdfast - root-like - attach the sponge to rocks. Adult sponges are sessile - unable to move. Adult sponges are sessile - unable to move.

4 Structure : Skeleton Spongin Spongin Spicule – hard, spike-like, particles of calcium carbonate of silicon dioxide that make up a sponges skeleton Spicule – hard, spike-like, particles of calcium carbonate of silicon dioxide that make up a sponges skeleton

5 Structure Collar cells-create a current of water through the sponge. Collar cells-create a current of water through the sponge. Thousands of pores let water flow through it continually. Thousands of pores let water flow through it continually. Water exits through the osculum – opening at the top of the sponge. Water exits through the osculum – opening at the top of the sponge.

6 Filter Feeding Obtain nourishment and oxygen from this water. Obtain nourishment and oxygen from this water. Engulfed by collar cells and passed to amebocytes which distribute the nutrients to the rest of the body. Engulfed by collar cells and passed to amebocytes which distribute the nutrients to the rest of the body.

7 Reproduction Budding Budding Gemmules Gemmules Regeneration Regeneration Sexual reproduction Sexual reproduction

8 Sexual Reproduction 1. Sperm released 2. Egg is fertilized 3. Larva form and leave the sponge. 4. Larva settles and attaches to an object. 5. Larva grows into an adult sponge.

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10 Examples of cnidarians Jellyfish Jellyfish Sea anemones Sea anemones Coral animals Coral animals

11 Characteristics of Cnidarian Invertebrates Invertebrates Radial symmetry Radial symmetry Tentacles with stinging cells. Tentacles with stinging cells.

12 The two different forms of a Cnidarian body Vase shaped Sessile existence Bell shaped Specialized for swimming

13 Movement Most cnidarians are slow-moving or sessile Most cnidarians are slow-moving or sessile Found on shallow ocean floors, the bottom of ponds or drifting about in water currents. Found on shallow ocean floors, the bottom of ponds or drifting about in water currents.

14 Characteristics Gastrovascular cavity Gastrovascular cavity –center of the body –Hollow gut –One opening surrounded by tentacles

15 Feeding and Defense Cnidocytes – cells found on tentacles used for defense & capturing prey. Cnidocytes – cells found on tentacles used for defense & capturing prey. Nematocyst – organelle in cnidocyte which can eject a filament with poison. Nematocyst – organelle in cnidocyte which can eject a filament with poison.


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