Platyhelminthes VMP 920 Infection & Immunity II Veterinary Parasitology.
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Transcript of Platyhelminthes VMP 920 Infection & Immunity II Veterinary Parasitology.
Nematoda Triploblastic Bilateral Cuticle (secreted) Longitudinal Muscles
only Psuedocoelomate Dioecious Complete Digestive Tract Cylindrical body
Triploblastic Bilateral Syncytial Tegument Longitudinal & Circular
Muscle Layers Acoelomate (=>
Parenchyma) Hermaphroditic =
Monoecious (Except Blood Flukes are
Dioecious) Incomplete Digestive
Tract (Absent in Cestodes) Dorso-ventrally Flattened
Platyhelminthes
Platyhelminthes Groups
Class Turbellaria = Planarians Class Trematoda = Flukes
Subclass Aspidogastrea Subclass Digenea
Class Monogenea = Mongeneans
Class Cestoda = Tapeworms
Aspidogastrean Trematodes
Ecto-Parasites of Molluscs, Fish, & Reptiles
Aspidogaster sp., Cotylogaster sp.
MonogeneansFlukes: Ecto-Parasites of Fish
Group of Veterinary Importance Gyrodactylus sp., Polystomum sp.,
Benedinia sp.
Digenean TrematodesFlukes: Endo-Parasites of Vertebrates
Group of Veterinary ImportanceFasciola sp., Paragonimus sp., etc.
CestodesTapeworms: Endo-Parasites of Vertebrates
Group of Veterinary Importance Taenia sp., Anoplocephala sp., etc.
Digenean Trematodes
1. Flatworms 2. Complex Life Cycles
a. digenea ==> (di = two), (genea = beginnings)
b. Sexual Reproduction => Adult worms in definitive host
c. Asexual Reproduction => Larval worms in snail host
Digenean TrematodesMorphology
1. General Flatworm Characteristics 2. Suckers and/or holdfast organs3. Incomplete gut4. Reproductive organs
(testes, ovary, vitellaria)
Digenean TrematodesComplex Life Cycle
1. Definitive Hosta. Adult Worms (Sexual Reproduction)
2. Environmenta. Ovum (Distribution)b. Miracidium (Distribution)
3. Molluscan 1st Intermediate Host a. Sporocysts and/or Rediae (Asexual
Reproduction)4. Environment
a. Cercaria (Distribution)5. 2nd Intermediate Host or Environment
a. Metacercaria (Transmission)
Digenean Groups
Large Animals
Liver Flukes & Bile Duct Flukes
Fasciola (ruminants)Fascioloides (ruminants)Dicrocoelium (ruminants)
Intestinal FlukesLecithodendrid Fluke
(bat/horse)
Small AnimalsBile & Pancreatic Duct
FlukesPlatynosomum (cats)Eurytrema (cats)
Lung FlukesParagonimus (dogs, cats)
Intestinal FlukesNanophyetus (dogs, cats)
Blood FlukesHeterobilharzia (dogs)
In general, flukes are grouped by location in definitive host.