2030lecture9 - OUTLINE Pseudocoelomates rotifers and...

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1 OUTLINE Pseudocoelomates rotifers and nematodes Animal Diversity 5 th Ed. Chapter 9, Pages 164 - 177 1. Introduction 2. Phylum Rotifera 2.1 General characteristics 2.2 Reproduction 3. Phylum Nematoda 3.1 General characteristsics 3.2 Parasitic strategies Animal Diversity 5 th Ed. Chapter 12, Pages 222 - 234 Lecture 9 - 1 INTRODUCTION Pseudocoelomates Adaptive potential 1. space for development of more sophisticated organ systems 2. permits simple circulation of material throughout body 3. fluid storage area for waste build up prior to processing 4. hydrostatic support (skeleton) Complete digestive tract i.e. mouth-to-anus Possess a fluid (or gelatinous filled) pseudocoel Lecture 9 - 2
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2 INTRODUCTION Pseudocoelomates are generally eutelic Eutely – mitotic divisions cease early in development - increases in body size are due to an increase in cell size rather then cell number - different organs and tissues are characterized by species-specific numbers of nuclei Lecture 9 - 3 PHYLUM ROTIFERA - general characteristics Two ciliated anterior lobes characteristic of rotifera Corona - ciliated surface of anterior lobes Cilia beat metachronally, gives the impression of rotation Coronal cilia used for both locomotion and feeding Lecture 9 - 4
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3 GENERAL CHARACTERISTSICS Feeding and digestive apparatus Mouth Mastax Mastax - muscular modification of pharynx Trophi – rigid structures within
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2030lecture9 - OUTLINE Pseudocoelomates rotifers and...

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