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2030lecture6 - OUTLINE Phylum Cnidaria Jellyfish etc 1...

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1 OUTLINE Phylum Cnidaria Animal Diversity 5 th Ed. Chapter 7, Pages 123 - 146 4 th Ed. Chapter 7, Pages 122-144 1. Introduction 2. Body Forms and Structure 3. Cnidocytes 4. Nerve Net 5. Feeding & Digestion 6. Sensory Structures - Jellyfish etc. checkbld Lecture 6 - 1 BODY FORMS epidermis mesenchyme gastrodermis gastrovascular cavity 1. Polyp Morph 2. Medusae Morph anus anus mouth mouth Cnidarians fit into one of two morphological types – i.e. dimorphism diploblastic (mesoglea) Lecture 6 - 2
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2 BODY FORMS Polymorphic colonial forms Gastrozooid polyps - feeding polyps with mouth and tentacles for prey capture Mutualistic hydrozoan colony on hermit crab shell Dactylozooid polyps - 'naked' polyps without mouth - functions include prey capture and defense Gonozooid polyps - reproductive 'naked' polyps without mouth - produce male or female medusae/gametes - sessile Lecture 6 - 3 BODY FORMS Free living polymorphic colonial forms – Physalia physalis Polyp morphs Gas-filled float (modified polyp), pneumatophore gonozooids - male and female
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