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Anatomy, Life Cycle, and Classes of Cnidarians: Jellies & Corals

This lesson explores the anatomy, life cycle, and different classes of cnidarians, with a focus on jellies and corals. Students will learn about their characteristics, structures, and ecological roles. Drawing diagrams on the board helps in understanding the concepts.

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Anatomy, Life Cycle, and Classes of Cnidarians: Jellies & Corals

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  1. Lesson 10.2: Cnidarians (Jellies & Corals) *Refer to Chapter 6 in your Textbook

  2. Learning Goals: • I can label the anatomy of a cnidarian. • I can describe the life cycle of a cnidarian. • I can differentiate between the different classes of cnidarians.

  3. Cnidarian Characteristics: • Tissues, but still no organs • Radial Symmetry: • have a central axis (like a pizza) • Two Body Plans: • Polyp: sessile stage • Medusa: free-floating stage

  4. Cnidarian Structures: • Tissues: • Ectoderm (or Epidermis): outer most layer of cells • Mesoglea: gelatinous material making up majority of the animal’s body • Endoderm: lining of the inside of the body • Gastrovascular cavity: (pre-stomach) • where digestion occurs • Mouth/Anus: • food enters and waste is removed

  5. Cnidarian Structures: • Tentacles: • feeding and locomotion • Nematocysts: • Coiled stinging dart ready to strike located on tentacles • Cnidocytes: • Stinging cells located within the dart

  6. Cnidarian Life Cycle: • Both asexual and sexual in same cycle • Asexual: • From polyp to medusa • Sexual: • From medusa to polyp *Draw the diagram on the board

  7. Cnidarian Classes: • Class Hydrozoa: • Colony = individual members physically connected and adapted to share resources • Ex. Portuguese Man of War • Individual polyps have different roles: • Feeding - Carnivorous Predator • Reproduction • Defense

  8. Cnidarian Classes: • Class Schyphyzoa“True Jellies” • Medusa is the predominant stage • Carnivorous Predator • Class Cubozoa“Box Jellies” • Most venomous jellyfish in the world • Carnivorous Predator

  9. Cnidarian Classes: • Class Anthozoa“Flower animal” • Sea anemones and corals • No medusa stage, Sessile • Corals secrete a hard skeleton • Suspension feeding: grab plankton from the water while sessile

  10. Cnidarian Ecological Roles: • Symbiotic Relationships: • Zooxanthellae with Coral • Clownfish with Anemone • Habitat: • Coral reefs are the most diverse ecosystem on Earth • Human: • Tourism • Pets • Medicine

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