Platyhelminthes

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11 Terms

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Triploblastic

Endoderm, ectoderm, and cellular mesoderm

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Acoelomate

No true tissue

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Cephalization

Nervous tissue and sensory organs closer at the front end of the animals body

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Blind gut

Complex gut ( no anus)

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Hermaphroditic

Complex reproductive system

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Protonephridia

Excretion and osmoregulation

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Gas exchange

Uses entire body surface

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Class Turbellaria ( free-living flatworms)

  • free living

  • Aquatic

  • The mouth leads to the pharynx (throat)

  • Epidermis ciliated (move things down)

  • Gut = diverticula( branched intestine)

  • Polycaladia( multibranched)

  • Tricaldia( gut 3 branched)

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Class Monogenea ( flukes)

  • Ventral sucker

  • Anterior prohaptor ( feeding)

  • Posterior hooked opisthaptor ( secure stay)

  • Parasitic to one host

  • Ectoparasitic on fish

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Class Trematoda ( flukes)

  • Oral sucker and acetabulum

  • Lack of prohaptor and opisthaptor

  • Tegument ( protective outer layer)

  • Parasitic to 2 or 3 host

    • Intermediate host ( mollusc)

    • 2nd host

    • definitive host ( vertebrate)

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Class Cestoda ( tapeworms)

  • Endoparasitic of the intestine of verts

  • Teguments

  • Scolex( hook for feeding)

  • Strobila is composed of proglottids ( reproductive area)

  • Digestive tract absent