General Characteristics of Platyhelminthes

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Questions and Answers

Which class of organisms has an outer ectoderm with syncytial epithelium and a ciliated epidermis?

  • Class Turbellaria (correct)
  • Class Cestoda
  • Class Digenea
  • Class Monogenea

Which class of organisms is supplied with hooks and suckers containing rhabdites?

  • Class Cestoda
  • Class Digenea (correct)
  • Class Turbellaria
  • Class Monogenea

Which type of small bodies, when discharged into water, form a protective gelatinous sheath around the body of planarians?

  • Syncytial bodies
  • Mesodermal bodies
  • Rhabdites (correct)
  • Endodermal bodies

Which layer under the epidermis of planarians contains two layers of muscles, an outer circular muscle layer and an inner longitudinal muscle layer?

<p>Mesoderm (B)</p> Signup and view all the answers

What is the term for the outer circular muscle layer under the epidermis of planarians?

<p>Circular syncytium (D)</p> Signup and view all the answers

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Study Notes

Characteristics of Platyhelminthes

  • Body is dorso-ventrally compressed with bilateral symmetry.
  • They are triploblastic animals, meaning they have three primary layers of cells: ectoderm, mesoderm, and endoderm.
  • Epidermis can be:
    • Soft and ciliated (as in Turbellaria)
    • Covered by tegument with external suckers, hooks, or both for attachment to the host (as in Monogenea, Digenea, and Cestoda)
  • They do not have a secondary body cavity, making them acoelomates.
  • Muscular system is well-developed.
  • Incomplete digestive system, with a mouth but no anus.
  • Excretory system consists of flame cells or solenocytes.
  • They possess some sense organs and a central nervous system.
  • Sexes are usually monoecious (hermaphrodite) with a complicated reproductive system, except in Schistosoma.
  • They lack skeletal, circulatory, and respiratory systems.

Classification

  • Kingdom: Animalia
  • Subkingdom: Metazoa
  • Branch: Eumetazoa (Enterozoa)
  • Phylum: Platyhelminthes (meaning 'flat worms')

General Characteristics

  • Bilaterally symmetrical
  • Dorsoventrally flattened body shape, earning them the common name 'flatworms'
  • Acoelomates, with an internal cavity filled with parenchyma or mesenchyme cells, but no body cavity

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