2030lecture12 - OUTLINE Phylum Annelida 1. Introduction 2....

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1 OUTLINE Phylum Annelida Animal Diversity 5 th Ed. Chapter 11, Pages 204 - 221 4 th Ed. Chapter 11, Pages 203 - 218 2. Body Form and Function 1. Introduction - general aspects/metamerism - locomotion 3. Circulatory System 4. Excretion 5. Salt and Water Balance 6. Assigned Reading Lecture 12 - 1 INTRODUCTION Phylum Annelida Lateral “appendages” Polychaeta Hirudinea Oligochaeta Class Setae present absent Suckers absent oral and posterior present (parapodia) absent absent c Lecture 12 - 2
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2 BODY FORM AND STRUCTURE prototroch mouth anus teloblastic growth zone Paired teloblast cells: - ectodermal - mesodermal peristomium Trochophore larva episphere - location of mouth mouth Lecture 12 - 3 clitellum prostomium pygidium segment or metamere peritoneal septa well developed musculature Metamerism, body divided into a serial succession of segments BODY FORM AND STRUCTURE homonomous peristomium Lecture 12 - 4
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Ventral Dorsal cuticle , with pores for mucus secretion epidermis , epithelial cells + mucus, sensory and photoreceptor cells circular muscles (metamere elongation) longitudinal muscles (metamere widening) setae , paired chitinous “bristles” to increase traction typically ventro- and dorsolateral BODY FORM AND STRUCTURE Locomotion coelomic fluid Lecture 12 - 5 body wall muscles : coelomic fluid circular muscles contract septa BODY FORM AND STRUCTURE Ant. Post. 1
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2030lecture12 - OUTLINE Phylum Annelida 1. Introduction 2....

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