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Questions and Answers
Which of the following is a common feature of both trematodes and cestodes (tapeworms)?
What is the defining characteristic of the trematode class Digenea?
What is the primary function of the sporocysts and/or redia larval stages in the digenean life cycle?
Which of the following is a key difference between the Trematoda and Cestoda (tapeworms) classes of Platyhelminthes?
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Which of the following is a characteristic of the class Monogenea within the Trematoda?
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What is the primary function of the cercaria larval stage in the digenean life cycle?
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Which liver fluke species is commonly found in ruminants?
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Which fluke species is the vector for Potomac Horse Fever?
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Which fluke species is known as the "Feline Liver Fluke" and is the agent of "Lizard Poisoning"?
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Which fluke species is the vector for Salmon Poisoning Disease?
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Study Notes
Liver Flukes and Bile Duct Flukes
- Fasciola (ruminants): Fasciola hepatica, Common Liver Fluke
- Fascioloides (ruminants): Fascioloides magna, Giant American Liver Fluke
- Dicrocoelium (ruminants): Dicrocoelium dendriticum, Lancet Fluke
Intestinal Flukes
- Acanthatrium (bat/horse): Acanthatrium oregonense, Vector for Potomac Horse fever
Small Animals
Bile Duct and Pancreatic Duct Flukes
- Platynosomum (cats): Platynosomum fastosum, Feline Liver Fluke, Agent of “Lizard Poisoning”
- Eurytrema (cats): Eurytrema (Concinnum) procyonis, Raccoon Pancreatic Fluke
Lung Flukes
- Paragonimus (dogs, cats): Paragonimus kellicotti, Lung Fluke
Intestinal Flukes
- Nanophyetus (dogs, cats): Nanophyetus salmincola, Vector for Salmon Poisoning
Blood Flukes
- Heterobilharzia (dogs): Heterobilharzia americana, Canine Blood Fluke, Zoonosis, "Swamp itch" or "swimmer's itch"
Trematodes
Characteristics
- Triploblastic, Bilateral, Acoelomate ( => Parenchyma)
- Dorso-ventrally Flattened
- Longitudinal & Circular Muscle Layers
- Syncytial Tegument
- Incomplete Digestive System (Absent in Cestodes)
- Hermaphroditic = Monoecious (Except Blood Flukes are Dioecious)
Groups of Veterinary Importance
- Class Trematoda = Flukes
- Order Monogenea = Monogenetic Trematodes, Ecto-Parasites of Fish
- Order Digenea = Digenetic Trematodes, Endo-Parasites of Vertebrates
- Class Cestoda = Tapeworms, Endo-Parasites of Vertebrates
Digenetic Trematodes
- General Flatworms
- Complex Life Cycles
- digenea ==> (di = two), (genea = beginnings)
- Sexual Reproduction => Adult worms in definitive host
- Asexual Reproduction => Larval worms in snail host
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Description
Learn about the characteristics and classification of TREMATODES in Platyhelminthes, including their triploblastic nature, bilateral symmetry, acoelomate body plan, and other unique features. Explore the groups of veterinary importance such as Class Trematoda and Order Monogenea.
