1 / 31

Table of Contents

Sponges, Cnidarians, and Ctenophores. Chapter 33. Table of Contents. Section 1 Porifera Section 2 Cnidaria and Ctenophora. Section 1 Porifera. Chapter 33. Body Plan of Sponges. The phylum Porifera is made up of sponges .

Download Presentation

Table of Contents

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. Sponges, Cnidarians, and Ctenophores Chapter 33 Table of Contents Section 1 Porifera Section 2 Cnidaria and Ctenophora

  2. Section 1 Porifera Chapter 33 Body Plan of Sponges • The phylum Porifera is made up of sponges. • Sponges are sessile invertebrates that have no true tissues or organs. The simplest sponges are shaped like hollow cylinders. • The body wall of a sponge is composed of two layers of cells that are separated by a jellylike substance called mesohyl. • Choanocytes in the interior layer draw water through the ostia that penetrate the body wall. The water leaves through the osculum. • The body is supported by a skeleton made of spongin, spicules, or both.

  3. Section 1 Porifera Chapter 33 Sponges Click below to watch the Visual Concept. Visual Concept

  4. Section 1 Porifera Chapter 33 Structure of a Sponge

  5. Section 1 Porifera Chapter 33 Parts of a Sponge Click below to watch the Visual Concept. Visual Concept

  6. Section 1 Porifera Chapter 33 Collar Cells Click below to watch the Visual Concept. Visual Concept

  7. Section 1 Porifera Chapter 33 Feeding and Digestion in Sponges • Sponges feed by filtering small organisms and organic matter out of the water that passes through their body. This is called filter feeding. • Nutrients are distributed through the body by amoebocytes, cells which crawl about within the body wall.

  8. Section 1 Porifera Chapter 33 Feeding Habits of Sponges Click below to watch the Visual Concept. Visual Concept

  9. Section 1 Porifera Chapter 33 Reproduction in Sponges • Sponges can reproduce both asexually and sexually. • They reproduce asexually through: • producing buds or gemmules • regeneration of missing parts • They reproduce sexually through the joining of egg and sperm. • Most sponges are hermaphrodites, which can produce both eggs and sperm.

  10. Section 1 Porifera Chapter 33 Sexual Reproduction in Sponges

  11. Section 1 Porifera Chapter 33 Reproduction in Sponges Click below to watch the Visual Concept. Visual Concept

  12. Section 1 Porifera Chapter 33 Gemmules Click below to watch the Visual Concept. Visual Concept

  13. Section 2 Cnidaria and Ctenophora Chapter 33 • Section 33.2 Cnidarian and Ctenophora

  14. Section 2 Cnidaria and Ctenophora Chapter 33 Body Plan of Cnidarians • Animals in the phylum Cnidaria are radially symmetrical aquatic invertebrates that are more complex than the sponges. They have tissues and a few simple organs. • The cnidairan body is either a sessile polyp or a swimming medusa. Some cnidarians alternate between both types during their life cycles. • The body of a cnidarian consists of two cell layers: • an outer epidermis • an inner gastrodermis • The layers are separated by the mesoglea. • The gastrovascular cavity has a single opening (the mouth) surrounded by tentacles.

  15. Section 2 Cnidaria and Ctenophora Chapter 33 Feeding and Defense in Cnidarians • Cnidarians have cells called cnidocytes. • Each cnidocyte contains a nematocyst. • When a cnidocyte is stimulated, its nematocyst ejects a filament that can paralyze or ensnare prey. Nervous System in Cnidarians • The cnidarian nervous system is a diffuse web of interconnected nerve cells called a nerve net.

  16. Section 2 Cnidaria and Ctenophora Chapter 33 Cnidocyte Click below to watch the Visual Concept. Visual Concept

  17. Section 2 Cnidaria and Ctenophora Chapter 33 Characteristics of Cnidarians Click below to watch the Visual Concept. Visual Concept

  18. Section 2 Cnidaria and Ctenophora Chapter 33 Classification of Cnidarians The four classes of cnidarians are: • Class Hydrozoa • This class includes Obelia, man-o-war, and the hydra. • Hydrozoans may live as polyps, medusae, or mixed colonies. • Class Cubozoa • This class includes box jellies. • Cubozoans spend most of their lives as medusae. • Class Scyphozoa • This class includes jellyfish. • Scyphozoans spend most of their lives as medusae. • Class Anthozoa • This class includes sea anemones and corals. • Anthozoans live only as polyps.

  19. Section 2 Cnidaria and Ctenophora Chapter 33 Types of Cnidarians Click below to watch the Visual Concept. Visual Concept

  20. Section 2 Cnidaria and Ctenophora Chapter 33 Reproduction in Obelia

  21. Section 2 Cnidaria and Ctenophora Chapter 33 Movement of Hydra Click below to watch the Visual Concept. Visual Concept

  22. Section 2 Cnidaria and Ctenophora Chapter 33 Reproduction in Hydras Click below to watch the Visual Concept. Visual Concept

  23. Section 2 Cnidaria and Ctenophora Chapter 33 Reproduction in Aurelia

  24. Section 2 Cnidaria and Ctenophora Chapter 33 Reproduction in Jellyfish Click below to watch the Visual Concept. Visual Concept

  25. Section 2 Cnidaria and Ctenophora Chapter 33 Comparing Medusa and Polyp Bodies Click below to watch the Visual Concept. Visual Concept

  26. Section 2 Cnidaria and Ctenophora Chapter 33 Coral Reefs

  27. Section 2 Cnidaria and Ctenophora Chapter 33 Two Cnidarian Body Forms

  28. Section 2 Cnidaria and Ctenophora Chapter 33 Cnidarian Body Plan

  29. Section 2 Cnidaria and Ctenophora Chapter 33 Exploration of a Cnidarian

  30. Section 2 Cnidaria and Ctenophora Chapter 33 Development of Cnidarian Embryo

  31. Section 2 Cnidaria and Ctenophora Chapter 33 Phylum Ctenophora • Animals in the phylum Ctenophora are known as ctenophores and often called comb jellies. • Ctenophores move through the water by beating the cilia that occur in eight rows on the outside of their body. • Ctenophores capture prey with a sticky substance secreted by their colloblasts. • An apical organ at one end of the body enables ctenophores to sense their orientation in the water. • Most ctenophores are hermaphroditic. • Many ctenophores have bioluminescence.

More Related