Cestodes of domestic animals

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  1. Eucestodes
    • True tapeworms
    • Cyclophyllidea
  2. Cotyloda
    • Pseudotapeworms
    • Disphyllobothriidea
  3. Tapeworm Morphology
    • Dorsoventrally flattened
    • long, ribbon shaped
    • Strobila - chain of independent, progressively maturing reproductive units "proglottids"
  4. Cestode Anatomy
    • Neck: behind scolex, germinal region of worm
    • Strobila: body of worm
    • Proglottids: segments from least mature to most mature at end of worm. each contains complete sets of male and female reproductive organs - hermaprodite
  5. Six types of metacestodes
    • Cysticercus
    • Cysticercoid
    • Coernus
    • Strobilocercus
    • Hydatid Cyst
    • Tetrathyridium
  6. Cysticercus
    • metacestode
    • a fluid filled bladder with one inverted scolex
  7. Cysticercoid
    • metacestode
    • invertebrates only: reduced bladder
  8. Coernus
    • metacestode
    • like a cysticercus (fluid filled bladder) but has multiple inverted scolices
  9. Strobilocercus
    • metacestode
    • cat tapeworm Taenia taeniaformis
    • like a cysticercus (fluid filled bladder) but single scolex is attached to a bladder by a chain of segments
  10. Hydatid Cyst
  11. Tetrathyridium
  12. Scolex
    • holdfast organ
    • acetablua = suckers
  13. Rostellum
    • anchor
    • if present: armed
    • if absent: unarmed
  14. Tegument
    • body wall
    • absorbs nutrients
    • no mouth present
  15. Gravid Proglottids
    • one or two segments at the end of the tapeworm will drop off daily and exit the animal
    • mobile and shed in feces
    • appear like rice-sized segments
    • dry up and look like sesame seeds
    • contain the eggs or laval stage of the worm
  16. Dipylidium Egg
    contains multiple hexacanth embryos
  17. Taenia egg
    • Oncosphere - tapeworm larvae with six hooklets for mobility
    • Embryophore - hexacanth embryo with striated eggshell
  18. Oncosphere
    • Taenia egg
    • tapeworm larve with six hooklets for mobility
  19. Embryophore
    • Taenia egg
    • hexacanth embryo with striated eggshell
  20. Dipylidum lifecycle
    • Larval flea ingests hexacanth embryo
    • onchosphere matures into cysticercoid which is infective
    • flea is swallowed during grooming and D. caninum matures in the intestine of host
  21. Diplidium caninum
    • Species: most common in dog and cat
    • Symptoms: minor clinical significance anal irritation
    • metacestode stage: cysticercoid
    • Descrption: armed scolex, clusters of eggs in packets
    • Diagnosis: egg packets on fecal float, visualization of proglottids near rectum or in envrionment
    • Notes: must distinguish from Taenia spp. segments are oval in shape with two lateral genital pores
  22. Taenia spp
    • larval stage within the eggshell is called an oncosphere
    • eggshell is called an embryophore
    • metasestode: cysticercus
    • exception: Metacestode fro T. taeniaformis is strobilocercus
  23. Metacestode stage fro Taenia spp
    • Cysticercus
    • Exception: metacestode stage for T. taeniaformis is strobilocercus
  24. Definitive host for Taenia spp
    Dogs when they ingest the hexacanth embryo inside the intermediate host
  25. Intermediate host for Taenia pisiformis
  26. Intermediate host for Taenia hydatigena
    • ruminant intermediate
    • embryo develops into cysticercus stage in peritoneal cavity
  27. Intermediate host for Taenia ovis
    • sheep
    • embryo develops into cysticercus stage in the muscles
  28. Taenia taeniaeformis
    • CAT Taenia
    • Intermediate: rodent
    • embryo develops into pea sized nodule strobilocercus in the liver of mice and other small rodents
    • Cats can continue to become reinfected
  29. Echinococcus
    • E. granulosis
    • E. multilocularis
    • zoonotic
    • metacestode: hydatid cyst
    • only 3 proglottids total
    • diagnosis often post-mortum
  30. Echinococus granulosus
    • Intermediate host: ruminant, man
    • Definitive host: canids
    • Oncospheres invade circulatory system and lodg3e in organs, liver and lung
    • metacestode is large UNILOCULAR hydatid cyst with a thick wall
    • Cysts bud protoscolices
  31. Echinococcus multiocularis
    • Definitive hosts: fox, dog, cats
    • Intermediate host: rodents, humans
    • oncospheres lodge in liver
    • create thin walled MUTICOCULAR hydatid cysts
    • very invasive
  32. Moniezia spp
    • Intermediate host: pasture mite
    • Definitive host: ruminants
    • cattle and sheep
    • large > 1.6 cm wide
    • unarmed scolex
    • eggs square or triangular - pyriform apparatus
    • fecal flotation
  33. Anoplocephala spp
    • Intermediate host: free living pasture mite
    • Definitive host: equids
    • InfectL inestines, cecum, stomach
    • metacestode: cysticercoid
    • oblong scolex with lappets
    • wide and short proglottids
    • eggs: one or more flattened side, thick three layered shell
    • pyriform apparatus
    • fecal float
  34. Thysanosoma actinoides
    • fringed tapeworm
    • ruminants
    • Infect: bile ducts, pancreatic ducts, small intestine
    • Intermediate host: pscoid insect
    • prominent frings on the posterior aspect of each proglottid
    • eggs occur in packets of 6-12 eggs
    • no pyriform apparatus
    • diagnosis: fecal float
  35. Order: Diphyllobothriidea
    • similar to cyclophylidea
    • scolex with two longitudinal grooves for locomotion and attachment called bothria - lack sucker or rostellum
    • central genital pore on each segment
  36. Diphylobothriid eggs
    operculum at one end
  37. Dipyllobothriidea lifecycle
    • eggs: release hexacanth embryo in water called a coracidium
    • develops: into a procercoid (or sparganum) when ingested by a microscopic crustacean
    • second: host ingests crustacean and develops into plerocercoid
    • definitive host: ingests 2nd intermediate and becomes infected
  38. Spirometra spp
    • several species
    • Final hosts: dogs and cats
    • Intermediate host: aquatic copepods
    • Second intermediate host: vertebrates such as frogs, snakes, rodents
    • humans can be infected - Sparganosis
  39. Diphllobothrium spp
    • "broad fish tapeworm"
    • senile prolottids may detach in chains
    • Diphyllobothriid oval egg with operculum
    • metacestode is plerocercoid, found in the musculature of fish
    • dogs and cats infected upon ingestion of fish intermediate
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    egg type
    • Dipylidium egg
    • contains multiple hexacanth embryos
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    egg type
    • Taenia egg
    • oncosphere - tapeworm larvae with six hooklets for mobility
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    egg type
    • Taenia egg
    • Embryophore: hexacanth embryo with striated eggshell
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    Dipylidium caninum
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    Dipylidium caninum
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    Dipylidium caninum
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    Taenia spp
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    Taenia spp cysticercus stage
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    • Echinococcus multiocularis
    • multiocular hydatid cysts
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    Monizezia spp
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    Moniezia spp
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    Moniezia spp
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    Anoplocephala spp
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    Anoplocephala spp
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    • Thysansoma actinoides
    • "fringed tapeworm"
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    Mature segment of Diphyllobothriidea latum
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    • Diphyllobothriid eggs
    • Operculum at one end
    • releases hexacanth embryo in water called coracidium
    • Develops into procercoid (or sparganum) when ingested by a microscopic crustacean
    • Second host ingests curstacean and procercoid develops into pleroceroid
    • Definitive host ingests 2nd intermediate and becomes inected
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    Spirometra species
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Card Set:
Cestodes of domestic animals
2014-03-05 06:49:01
cestodes parasitology cpp cal poly pomona

Lab 7 AHS 302L Dr Wallace Winter 2013
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