Phylum Platyhelminthes Flat worm n Triploblastica n Acoelomate
Phylum Platyhelminthes Flat worm n Triploblastica n Acoelomate n Bilateral symmetry n Hermaphroditic n Monoecious n One opening for digestive system n 2
Triploblastica and Acoelomate Ectoderm Mesoderm Endoderm 3
Trematoda Cestoda Turbellaria 4
Class Turbellaria n Free living n Dorsoventrally flattened n Epithelial with cilia n Mouth at ventral side n Incomplete digestive tract 5
Dugesia n Freshwater turbellarian n Cosmopolitan species n Live at running water with leaves, rock, mud etc. n Camouflage 6
About 12 mm with dark brown n Bilateral symmetry n Dorsoventrally flattened n Head with auricles and eye spots n Pharyngeal opening at ventral side n Monoecious n 7
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Body wall Simple epidermal cells n Epidermal cells at ventrum with cilia for movement n Mucous gland made mucous secretion n n 1. 3. 5. 7. Epidermis 2. Basement mem. Circular mus. 4. Diagonal mus. Longitudinal mus. 6. Dorsoventral mus. Parenchymal cells 9
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Nutrition Carnivorous animal n Incomplete digestive tract n Mouth at ventrum under midline n Pharyngeal wall with epidermis, muscle and gastrodermis n Intestine with three branching caeca; one in ant. intestinal caecum and two in post. intestinal caeca n Branching diverticula n 13
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Anterior intestinal caecum Pharynx Posterior intestinal caeca 17
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Class Trematoda n Fluke worm n Parasites n Complex life cycle n Intermediate host n juvenile stage n Definitive host n adult stage 21
Clonorchis sinensis n 10 -25 มม. n Oral sucker ขนาดเลก ventral sucker อยใต genital pore ทายตวม excretory pore n Mouth Pharynx Esophagus Intestinal caeca 22
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Hermaphrodite ปฏสนธขามตว n Male organs : testis แตกแขนง 1 ค : vas efferens 2 ทอ รวมเปน vas deferens ตอนปลายพองเปน seminal vesicle ejaculatory duct เปดออกท genital pore อยเหนอ ventral sucker n 24
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Opisthorchis viverrini n Eat metacercaria in cyprinoid fish (muscle) 34
Fasciola hepatica Sheep liver fluke n หวรปสามเหลยมม oral sucker อยทปลายแหลม n Gonopore อยตำลงมา สวน ventral sucker อยใต gonopore n Eat vegetation with metacercaria n 35
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Class Cestoda n Tape worms n No digestive system n Live in intestine host n Superficial segmentation 48
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Immature proglottid 54
Mature proglottid Testes Uterus Vas deferens Seminal receptacle Ovary Yolk gland 55
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Taenia spp. n Taenia pisiformis พยาธตวตดสนข n Taenia solium พยาธตวตดหม n Taenia saginata พยาธตวตดวว 58
Testis Vas deferens Cirrus Genital pore 61
Uterus Ovary Vagina Seminal receptacle Ootype Mehlis’ gl. Vitellaria 63
Scolex 66
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Cysticercus cellulosae 68
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