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Phylum Platyhelminthes
BIO 2215 Oklahoma City Community College Dennis Anderson
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Phylum Platyhelminthes
Flat worms Triploblastic Acoelomate Bilateral symmetry Hermaphroditic Monoecious One opening for digestive system Paired lateral nerve cords & cerebral ganlion Flame cells
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Echinodermata Uniramia Chelicerata Chordata Crustacea Protochordates
Lophophorates Crustacea Protochordates Arthropoda Annelida Hemichordata Mollusca Other pseudocoelomates Nemertea Platyhelminthes Nematoda Ctenophora Cnidaria Mesozoa Placozoa Sarcomastigophora Ciliophora Porifera Apicomplexa Microspora Myxozoa
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Acoelomate Ectoderm Mesoderm Endoderm
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Fig. 14.1
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Acoelomate Phylum Platyhelminthes: Class Turbellaria
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Phylum Platyhelminthes: Class Turbellaria Acoelomate
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Pseudocoelomate Ectoderm Mesoderm Endoderm
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Coelomate Ectoderm Mesoderm Endoderm
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Nervous System Lateral nerve cord Cerebral ganglion Connectives
Eye spot Auricle
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Brain Auricle Cerebral ganglion Paired nerve cords
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Copyright © The McGraw-Hill Companies, Inc
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Excretory System
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Fig. 14.6a
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Fig. 14.6b
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Class Turbellaria Eye spots Ciliated surface Regenerate if cut in two
Most are free-living
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Copyright © The McGraw-Hill Companies, Inc
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Turbellaria
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Fig. 14.2
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Class Trematoda Flukes Parasites Holdfast devices Complex life cycle
Most Complex life cycle Intermediate host Animal with juvenile stage Definitive host Animal with adult stage
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Fig. 14.7
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Clonorchis sinensis Oral sucker Intestine Uterus Yolk gland Ovary
Seminal recepticle Testes
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Clonorchis sinensis Chinese liver fluke 50 million people
Cirrhosis of liver Diarrhea Edema Pain
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Fig
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Fascioloa hepatica Sheep liver fluke Sheep, cattle and man
Weight loss Eat vegetation with metacercaria
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Life Cycle of the Sheep Liver Fluke
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Life Cycle of the Sheep Liver Fluke
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Fasciolopsis buski Intestinal fluke 10 million people Man and pigs
Hemorrhage and abscesses of small intestine
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Paragonimus westermani
Lung fluke Carnivores, pigs, rodents and man May be fatal
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Schistosoma Blood flukes 200 million people 1 million deaths/year
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Life Cycle of a Schistosome Fluke
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Life Cycle of a Schistosome Fluke
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Schistosome Cercaria have forked tail
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Swimmers Itch
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Class Monogenea One host Ectoparasites Opisthaptor Mainly fish
Attachment to host
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Class Cestoidea Tape worms No digestive system 40 feet long
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Scolex
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Proglottid Testes Uterus Vas deferens Seminal receptacle Ovary
Yolk gland
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Pork Tapeworm (Taenia solium)
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Pork Tapeworm (Taenia solium)
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Taenia saginata
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Life Cycle of the Broad Fish Tapeworm
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Life Cycle of the Broad Fish Tapeworm Diphyllobothrium latum Source: Redrawn From Centers for Disease Control, Atlanta, GA.
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Dipylidium caninum
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Echinococcus granulosus
Parasite of dogs Host Juveniles in sheep, man and other mammals Intermediate host Hydatid cyst
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Hydatid Cyst Cysticercus Juvenile stage
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Ecinococcus granulosus
Adult stage in dog
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