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Worms

Worms. Phylum Platyhelminthes - flatworms Phylum Nematoda - roundworms Phylum Annelida - segmented worms. Phylum Platyhelminthes Flat worms. Characteristics: Billateral symmetry Gastrointestinal cavity – organ level of organization Pharynx – universal mouth & anus

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Worms

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  1. Worms Phylum Platyhelminthes - flatworms Phylum Nematoda - roundworms Phylum Annelida - segmented worms

  2. Phylum PlatyhelminthesFlat worms Characteristics: Billateral symmetry Gastrointestinal cavity – organ level of organization Pharynx – universal mouth & anus Sensory organs near head Pseudocoelum Tripoblastic – 3 cell layers Platyhelminthes Classes Turbellaria –planaria Trematoda - liver flukes Cestoda – tapeworm Monogenae - single species fluke

  3. 1. Turbellaria –planaria

  4. 2. Trematoda - liver flukes

  5. 3. Cestoda – tapeworm

  6. 4. Monogenae – single species fluke

  7. Phylum NematodaRound worms • Characteristics: Characteristics of Nematoda:-1)Bilaterally or radial symmetrical 2)Tripoblastic - 3cell layers, 3)Tissue and organ level of organization. 4) pseudocoel5)Body possesses a through gut with a subterminal anus. 6)Has a nervous system with pharyngeal nerve ring. • Nematoda Classes (not required knowledge) • Adenophorea - • Secernentea -

  8. Nematoda samples

  9. Nematode Pathogens

  10. Phylum AnnelidaSegmented worms • Characteristics: Characteristics of Nematoda:-1)Bilaterally symmetrical 2)Tripoblastic - 3cell layers, 3)Tissue and organ level of organization. 4)Coelum 5)Has a nervous system. 6)Has vascular system. • Nematoda Classes • Oligochaeta- Earth worms • Polychaeta - Marine worms • Hirudinae - Leeches • Archiannelida – aka Haplodrili

  11. 1. Oligochaeta - Earth worms

  12. 2. Polychaeta - Marine worms

  13. 3. Hirudinae - Leeches

  14. 4. Archiannelida – a.k.a. Haplodrili

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