Questions and Answers
What are the 4 classes of phylum Platyhelminthes?
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?
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What are the 3 ways in which a turbellarian moves?
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Turbellarians are omnivores.
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What do turbellarians eat?
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What structure do turbellarians use to eat?
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Why are turbellarians called 'potty mouths'?
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What type of digestive system do turbellarians have?
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How does food get to the cells in various parts of the turbellarian's body?
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What type of nervous system do turbellarians have?
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What is the ganglia?
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The ganglia is located at the anterior end of the turbellarian's body.
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What are ocelli?
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What does ocelli literally mean?
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What are auricles?
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Auricles are located on the sides of the turbellarian's head.
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In what system does water remain constant throughout the turbellarian?
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What process does the excretory system use to evenly distribute the water?
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What would happen if the turbellarian would absorb too much water?
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What would happen if the turbellarian wouldn't absorb enough water?
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Removing waste is the primary function of flame cells.
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How do turbellarians reproduce?
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What type(s) of asexual reproduction do turbellarians use?
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What kinds of binary fission are there?
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Transverse division is when the turbellarian is split across the x-axis.
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Longitudinal division is when the turbellarian is split across the y-axis.
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Turbellarians are (monoecious, hermaphrodites, dioecious).
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What hatches from the turbellarian's egg?
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In general, which of the following classes contain parasitic members?
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Ganglia refers to?
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Auricles are?
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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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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.
