Platyhelminthes
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Platyhelminthes. By: Andrew Ibach & Jennifer Kapinus. Platyhelminthes Common Name: Flatworm. Three classes: Turbellaria Free-Living Flatworm Trematoda Flukes Cestoda Tapeworms. Body Symmetry. Bilateral If split in half, left and right, both sides would be identical to each other

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Platyhelminthes

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Platyhelminthes

Platyhelminthes

By: Andrew Ibach & Jennifer Kapinus


Platyhelminthes common name flatworm

PlatyhelminthesCommon Name:Flatworm

  • Three classes:

    • Turbellaria

      • Free-Living Flatworm

    • Trematoda

      • Flukes

    • Cestoda

      • Tapeworms


Body symmetry

Body Symmetry

  • Bilateral

    • If split in half, left and right, both sides

      would be identical to each other

  • Cephalization

    • Concentration of sensory equipment in one end, the head, of the organism


Body plan

Body Plan

  • Dorsally, ventrally flat

  • Triplpoblastic (three tissue layers)

    • Endoderm

    • Mesoderm

    • Ectoderm

  • Acoelomate (no body cavity between the digestive cavity and outer body wall)


Support movement system

Support & Movement System

  • Turbellians use cilia to move

  • Trematoda & Cestoda rely on the host's circulation


Nutrition

Nutrition

  • One digestive opening

    • branches to all parts of the body.

      • Turbellarianshave a muscular pharynx to move food which they get from eating mollusks and worms.

      • Parasitic classes rely on the host for digestion, absorbing nutrients from the host.


Gas exchange

Gas Exchange

  • No organs for respiration

    • Diffusion from body surface to body cells


Excretion water balance

Excretion/ Water Balance

  • Osmotic balance with environment

    • Protonephridia

      • Networks of tubules with ciliated structure called fame bulbs that pull fluid through branched ducts opening to the outside.


Reproduction

Reproduction

  • Sexual Reproduction

    • Males pierces female’s body surface and releases sperm into her

  • Asexual Reproduction

    • Budding

    • Self-fertilization

    • Fission


Response to stimuli

Response to Stimuli

  • Eyespots

    • Light sensitive

  • Nerve System

    • Ganglions by eye spots

      • Nerves run all the way along body from ganglions

    • Can learn to modify responses to stimuli


Defense mechanisms

Defense Mechanisms

  • Bright colors

    • Associated with bad taste due to toxins inside flatworm

      • This deters predators from attacking the brightly colored prey again.


Other information

Other Information

  • Flatworms are primarily aquatic

  • Flatworms have no circulatory organs

  • There are no open cavities in a flatworm


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