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Oklahoma City Community College
Phylum Annelida BIO 2215 Oklahoma City Community College Dennis Anderson
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Segmented Worms Body divided into repeating segments
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Sedentary Fig. 17.2b
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Terrestrial Earthworm
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Feed on Blood Leech
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Echinodermata Uniramia Chelicerata Vertebrata Crustacea Other Chordata
Lophophores Crustacea Other Chordata Arthropoda Annelida Hemichordata Mollusca Other pseudocoelomates Nemertea Platyhelminthes Nematoda Ctenophora Cnidaria Mesozoa Placozoa Sarcomastigophora Ciliophora Porifera Apicomplexa Microspora Myxozoa
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Phylum Annelida Segmented body Setae Coelom divided by septa
metameric Setae Absent in leeches Coelom divided by septa Closed circulatory system Nephridia for each segment (metamere)
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Circulatory Systems
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Metamerism Septa Pygidium Prostomium Peristomium
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Trochophore larva Apical tuft Stomach Ciliary band Mouth Anus
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Annelid development
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Class Polychaeta Many setae Parapodia
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Fig. 17.3
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Class Polychaeta Parapodium Head Tentacle
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Polychaete Worm Predatory
Jaw Tentacle Everted pharynx Palp Eye Cirrus Parapodium
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Nereis
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Class Polychaeta
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Class Polychaeta Fireworm
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Sedentary Polychaete Lugworm
Fig. 17.5
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Fig. 17.4
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Pelagic* Polychaete *Drift in the open ocean
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Class Oligochaeta Few setae Clitellum No parapodia Monoecious
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External Structures of an Earthworm
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. External Structures of an Earthworm
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Lumbricus terrestris Feed on decaying organic matter Enrich soil
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Fig. 17.1
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Internal Structures of an Earthworm
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Internal Structures of an Earthworm
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Fig c
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Body wall Epithelium Circular muscle Longitudinal muscle
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Metanephridium Dorsal vessel Bladder Nephridiopore Nephrostome
Ventral vessel
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Fig Fig
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Fig
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Earthworm Reproduction
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Earthworm Reproduction
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Class Hirudinea Anterior & posterior sucker No setae
Most live in fresh water Feed Invertebrates Body fluids Blood
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Fig
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The End
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