Class Turbellaria Flashcards
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Questions and Answers

What are the 4 classes of phylum Platyhelminthes?

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

    • What class in phylum Platyhelminthes is free-living?

    Class Turbellaria

    What is the genus of a free-living turbellarian?

    Dugesia

    In what environment would you find a turbellarian?

    <p>Lake, pond, creek, river, sea, moist place on land</p> Signup and view all the answers

    What are the 3 ways in which a turbellarian moves?

    <p>Uses cilia, undulation, rock climb with mucous</p> Signup and view all the answers

    Turbellarians are omnivores.

    <p>False</p> Signup and view all the answers

    What do turbellarians eat?

    <p>Invertebrates, protozoans, or dead animals</p> Signup and view all the answers

    What structure do turbellarians use to eat?

    <p>Pharynx</p> Signup and view all the answers

    Why are turbellarians called 'potty mouths'?

    <p>Because they obtain food through the same opening as they excrete waste</p> Signup and view all the answers

    What type of digestive system do turbellarians have?

    <p>Incomplete</p> Signup and view all the answers

    How does food get to the cells in various parts of the turbellarian's body?

    <p>Diffused into cells</p> Signup and view all the answers

    What type of nervous system do turbellarians have?

    <p>Ladder system/longitudinal nerve cords</p> Signup and view all the answers

    What is the ganglia?

    <p>Mass of nerve cells/simple brain</p> Signup and view all the answers

    The ganglia is located at the anterior end of the turbellarian's body.

    <p>True</p> Signup and view all the answers

    What are ocelli?

    <p>Eyespots that detect light</p> Signup and view all the answers

    What does ocelli literally mean?

    <p>Little eyes</p> Signup and view all the answers

    What are auricles?

    <p>Sense lobes that wiggle around to touch and sense surroundings</p> Signup and view all the answers

    Auricles are located on the sides of the turbellarian's head.

    <p>True</p> Signup and view all the answers

    In what system does water remain constant throughout the turbellarian?

    <p>The excretory system</p> Signup and view all the answers

    What process does the excretory system use to evenly distribute the water?

    <p>Osmosis (diffusion by water)</p> Signup and view all the answers

    What would happen if the turbellarian would absorb too much water?

    <p>It would explode!</p> Signup and view all the answers

    What would happen if the turbellarian wouldn't absorb enough water?

    <p>It would shrivel up and die</p> Signup and view all the answers

    Removing waste is the primary function of flame cells.

    <p>False</p> Signup and view all the answers

    How do turbellarians reproduce?

    <p>Both asexually and sexually</p> Signup and view all the answers

    What type(s) of asexual reproduction do turbellarians use?

    <p>Binary Fission and Budding</p> Signup and view all the answers

    What kinds of binary fission are there?

    <p>Transverse and longitudinal division</p> Signup and view all the answers

    Transverse division is when the turbellarian is split across the x-axis.

    <p>True</p> Signup and view all the answers

    Longitudinal division is when the turbellarian is split across the y-axis.

    <p>True</p> Signup and view all the answers

    Turbellarians are (monoecious, hermaphrodites, dioecious).

    <p>Monoecious</p> Signup and view all the answers

    What hatches from the turbellarian's egg?

    <p>Miniature adults</p> Signup and view all the answers

    In general, which of the following classes contain parasitic members?

    <p>Answers B-D</p> Signup and view all the answers

    Ganglia refers to?

    <p>A mass of nerve cells that acts like a brain</p> Signup and view all the answers

    Auricles are?

    <p>Sensory lobes located on the side of the organism's head</p> Signup and view all the answers

    Study Notes

    Phylum Platyhelminthes Overview

    • Comprised of four classes: Class Turbellaria, Class Monogenea, Class Trematoda, Class Cestoda.
    • Class Turbellaria holds free-living members.

    Turbellaria Characteristics

    • Genus of free-living turbellarians: Dugesia.
    • Found in diverse aquatic environments (lakes, ponds, rivers, seas) and moist terrestrial areas.

    Locomotion and Feeding

    • Movement achieved through cilia, undulation, and mucous for climbing.
    • Diet consists of invertebrates, protozoans, and decomposed animals.
    • Pharynx is the structure used for feeding, with dual purpose as waste excretory opening.

    Digestive System

    • Turbellarians possess an incomplete digestive system.
    • Nutrients diffuse directly into body cells.

    Nervous System and Sensory Structures

    • Ladder-like nervous system featuring longitudinal nerve cords.
    • Ganglia serve as a simple brain located at the anterior end.
    • Ocelli, or "little eyes," function as light detectors.
    • Auricles act as sensory lobes for environmental interaction and are located on the sides of the head.

    Excretion and Water Regulation

    • Excretory system maintains constant water levels, utilizing osmosis for distribution.
    • Over-absorption of water can lead to cell rupture; too little water causes cellular shrinkage and potential death.
    • Flame cells primarily remove excess water, with waste removal as a secondary function.

    Reproduction

    • Turbellarians can reproduce both asexually (via binary fission and budding) and sexually.
    • Types of asexual reproduction include transverse and longitudinal binary fission.
    • They are monoecious and hermaphroditic, producing "miniature adults" from eggs.

    Parasitic Classes

    • Class Turbellaria is free-living, while classes Monogenea, Trematoda, and Cestoda include parasitic members.

    Key Definitions

    • Ganglia: Mass of nerve cells providing basic brain functions.
    • Auricles: Sensory structures for detecting surroundings.

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    Description

    Explore the fascinating world of Class Turbellaria through these flashcards. Learn about the four classes of phylum Platyhelminthes and delve into the characteristics that differentiate free-living turbellarians. Perfect for students and enthusiasts of biology, these cards will enhance your understanding of flatworm diversity.

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