Cestodes

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  1. Image UploadDog
    Name:
    Intermediate Host:
    • Dipylidium caninum packet of eggs
    • Intermediate host is the flea.
  2. Image Upload
    Packet of Dipylidium caninum eggs. The small packets may be detected by flotation, the larger packets sink when the specimen is centrifuged.
  3. Image UploadDog
    Name:
    Nickname:
    • Eggs of Taenia pisiformis
    • Common rabbit cyst tapeworms
    • leave the host within the ripe tapeworm proglottids; however, eggs may be found during microscopic examination of feces. Individual eggs. Similiar to coccydia
  4. Image UploadCat
    Taenia taeniaeformis (cat) 4 enclosed in embryonic membranes X 410
  5. Image Upload
    • A = Mesocestoides - blunt triangular shape
    • B = Dipylidium - taper at both ends (grains of rice)
    • C = Taenia - more rectangular appearance
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    • A = Dipylidium
    • B = Taenia
    • C = Mesocestoides
  7. Image UploadCat
    Taenia taeniaeformis - the most common tapeworm of cats. Note serrated edge (arrow) produced by its angular shape.
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    Anoplocephala magna in small intestine of horse
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    Anoplocephala perfoliata at the ileocecal valve in the cecum of a yearling.
  10. Image UploadHorse
    Anoplocephalan tapeworm egg from horse. Note: hooks at arrow
  11. Image UploadCow
    Name:
    Nickname:
    Species:
    Similiar to:
    • Eggs of Monieza expansa
    • lrg tapeworms
    • cattle, sheep and goats. 
    • The eggs of Monieza benedeni are similar to these. X100
  12. Image UploadCow
    • Eggs of Monieza expansa 
    • Note: the pear-shaped embryo which contains 6 hooklets X410
  13. Image Upload
    Name:
    Common name
    Species:
    Packet if eggs of Thysanosoma actinoides, the "fringed tapeworm" of sheep and goats. These egg packets usually leave the host within the tapeworm segments, hence are seldom found during routine fecal examination.
  14. Image UploadSheep
    A packet containing eggs of Thysanosoma actinoides. 5 eggs are visible within the packet and one egg is free.
  15. Image UploadDog
    Name
    # of Hooklets
    Each packet contains how many eggs?
    Dipylidium caninum - each egg is provided with 6 hooklets. The only tapeworm of dog, cat and fox whose eggs are contained in packets. Each packet contains 5-20 eggs,
  16. Image UploadDog
    Taenia pisiformis - Note: radically striated shell and embryonic hooklets. The egg at the right is contained within an embryonic membrane. X400
  17. Image UploadCat
    Name
    Old Genus
    Eggs of Taenia (Hydatigera old genus) taeniaformis  - a common tapeworm. Impossible to differentiate from Taenia pisiformis of dog
  18. Image Upload
    Name
    Name of larvae
    Intermediate host
    • 5 eggs of Echinococcus granulosus, the hydatid cyst (larvae name) tapeworm now rarely reported in dogs and cats.
    • Intermediate host = man
    • Believed to be the 2nd most zoonotic parasite- 1st is Strongyloides stercoralis
  19. Image Upload
    Echinococcus granulosus - 3 eggs are in focus, other 2 are situated in the lower view X410
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    Crushed Dipylidium segment released these egg packets which fill the uterus of the mature proglottids. Egg packets may be up to 500 milimicrons.
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    Note: the radial arrangement of the Taenia eggs.
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    Taenia eggs freshly released from the segment. They have a yolk cell around them (arrow) but this is generally digested away during the passage down the intestines.
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    Egg of Dipylidium has a thin shell with slightly radial appearance. This is one of the few times you will see an egg out of the packet.
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    Embryos of Mesocestoides are protected by the wall of the uterine capsule and really have no protective shell. If this capsule is ruptured the fragile looking embryos are destroyed.
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    Dipylidium tapeworm segments on freshly passed stool. Proglottids are active when fresh but dry quickly.
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    Anatomy
    Mature Taenia segments have a creamy mass of eggs filling branches of the uterus. Each has a single reproductive system and one lateral pore. These pores may be prominent in some species but the most common Taenia pisiformis (dog) & Taenia taeniaformis (cat) they are not noticeable.
  27. Image Upload
    Anatomy
    Characteristically Dipylidium segments have 2 independent reproductive systems and two pores (arrow). This is a useful diagnostic feature in differentiating Dipylidium from other worms.
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    The club shaped appearance of Mesocestoides segments are produced by the tough uterine capsule at the end of each proglottid. Unlike Taenia tapeworms, individual eggs are not released but remain inside the capsule.
  29. Image Upload
    • Echinococcus are very small compared to those other tapeworms of dogs and cats (Taenias)
    • Remember the public health aspect
  30. When tapeworms are examined either fresh/hydration of dried segments the numerous __________ are useful in differentiating them from other tissues and artifacts that may be present in dog and cat feces.
    mineral granules
  31. Image Upload
    Recovery of Echinococcus sp. by purging with arecoline. Vomiting occurs shortly followed by passage of formed feces from the lower bowels, the Echinococcus - enriched small intestine ingest and mucus.
  32. All materials are examined for _________ is hazardous . Even species preserved in formadehyde may contain viable eggs for ______.
    • Echinococcus
    • several years
  33. Image UploadDog
    Diphyllobothrium - operculated
  34. Image UploadCat
    Spirometra - cats
  35. Image Upload
    Diphyllobothrium or Spirometra tapeworms are often passed in ribbons and each has a central pore through which the eggs are expelled.
  36. Image Upload
    Name:
    Definitive host:
    Cittotaenia - rabbit is the definitive host
  37. Image Upload
    Cittotaenia sp. from cat feces
  38. Image UploadCow
    Monieza sp. (dog often eats the feces of ruminant animals)
  39. Image UploadCow
    Monieza sp. egg, 3 pair of hooks are observed
  40. Image UploadHorse
    Name:
    Type & species:
    Other similar tapeworms:
    • Eggs of Anoplocephala mamillana
    • Nickname: small tapeworm
    • Species: horses
    • Anoplocephala magna & Anoplocephala perfoliata are similar
  41. Image UploadHorse
    Eggs of Anoplocephala mamillana. The eggs enclosed a pear shaped embryo having 6 hooklets X410
  42. Image UploadHorse
    Infection of Anoplocephala perfoliata with intussusception of ileum into cecum.
  43. Image UploadHorse
    Hyperplasia of ileal wall associated with Anoplocephala perfoliata infection.
  44. Image UploadHorse
    Cluster of the tapeworm Anoplocephala perfoliata at the ileocecal valve area of the cecum of a naturally infected horse.
  45. Image Uploadcow
    Name 2 common tapeworms
    • Monieza benedeni & Monieza expansa
    • Section of small intestine that has been opened to illustrate a natural infection of the tapeworm Monieza (benedeni or expansa)
  46. Tapeworms are common parasites of both cattle and sheep and are prevalent in calves and lambs during their _________________.
    first summer on pasture
  47. Image UploadDog
    Name
    Location
    Species
    • Dipylidium caninum is worldwide in distribution and common in the small intestine of the dog, cat and carnivores.
    • This slide shows numerous D. caninum on the open intestine of the dog
  48. Image UploadDog
    Dipylidium caninum - immature proglottids
  49. Image UploadDog
    Dipylidium caninum - illustrating gravid proglottids
  50. Image Upload
    A typical Dipylidium caninum egg packet
  51. Image UploadHuman
    Name
    Common name
    Infects what species
    Anatomy
    • Name: Taenia solium,
    • Common name: pork tapeworm
    • Infects: humans and swine.
    • Anatomy: Scolex with a rounded rostellum, alternating large and small hooks and four prominent suckers.
  52. Image UploadHog
    Parasite name:
    Larvae name:
    Penetrates and encysts where:
    • Parasite name: Taenia solium
    • Larvae name: Cysticerus cellulosae
    • Penetrates and encysts where: the muscular, nervous and lymphatic tissues.
    • This slide depicts muscle tissue carrying apx. 150 cystercerci per pound.
  53. The muscles of hogs may sometimes become so filled with cystericeri that the meat is known as ____________. Man usually acquires the infection by _____________.
    • "measly pork"
    • eating raw or poorly cooked pork
  54. Image Upload
    Larval name:
    Common/Nickname:
    • Larval name: Cysticerus cellulosae
    • Common/Nickname: pork tapeworms 
    • Slide shows tapeworm cysts in bovine heart
  55. Image Upload
    Cysticerus cellulosae in bovine heart
  56. Image UploadDog
    Name:
    Larval name:
    Life cycle similar to:
    Intermediate host:
    Definitive host:
    • This slide shows Taenia pisiformis
    • Larval name: Cysticercus pisiformis.
    • Life cycle is similar to Taenia solium
    • Intermediate host: Rabbit
    • Definitive host: dog, cat, wolves and other carnivores
  57. Image UploadDog
    Slide shows the scolex of the Taenia pisiformis cysticerci scolex attached to the mucosa by suckers and rostellum armed with rows of hooks.
  58. Image UploadCat
    Name:
    Definitive host:
    Intermediate host
    Location in intermediate host
    • Name: Taenia taeniaeformis 
    • Definitive host: domestic and wild cats Intermediate host: Rodents.
    • Location: They encapsulate themselves in the rodent's liver and produce cancer like growths. This slide depicts an adult T. taeniaeformis excised from a domestic cat.
  59. Image Upload
    Taenia taeniaeformis in larval form (Cysticercus fasciolaris) in an infected mouse.
  60. Image UploadCat
    • Taenia taeniaeformis
    • Larval strobilocercus (cysticerci whose forebodies have begun segmentation)
  61. Image UploadDog
    Name
    Location
    Species
    Larval stage name
    Nickname
    • Name: Taenia hydatigena 
    • Location: found in its adult stage in the intestines
    • Species: wild dogs, coyotes and wolves. Larval Name: Cysticercus tenuicollis 
    • Nickname: thin necked bladder worm.
    • Slide show a large Taenia hydatigena cyst formation removed from muscle tissue.
  62. Image UploadSheep
    Viable and calcified cyst of Cysticercus tenuicollis attached to the rumen in bighorn sheep
  63. Image Upload
    Name: 
    Larval Name:
    Location:
    • Name: Echinococcus granulosus 
    • Larval Name:"hydatid cysts"
    • Location: liver and lungs
    • Echinococcus cysts in the liver. It is a parasite of carnivores which forms  in various organs. Eggs ingested by wild and domestic herbivores (sheep, cattle) hatch and onchosperes invade the circulatory system and lodge in various parts of the body, esp. liver and lungs.
  64. Image Upload
    Numerous Echinococcus cysts in the lung of a sheep.
  65. Image UploadHog
    2 scoleces of Echinococcus granulosus from the liver of a 10 month old hog. Notice the hooks (arrow) present in one scolex.
  66. Image UploadCamel
    • Shows a cyst in a camel lung. Notice the numerous brood capsules budding from the membrane of the thick cyst wall. 
    • Echinococcus granulosus
  67. Image UploadHuman
    Illustrates the fine structure of large unruptured Echinococcus granulosus cysts in a human liver.
  68. Image UploadHorse
    This slide shows Anoplocephala perfoliata in a horse attached to the cecal mucosa near the ileocecal junction
  69. Anoplocephala perfoliata is a member of the family ___________ posses scoleces w/o hooks and 1 single or double female reproductive organs. The cysterceroid stage occurs in _______. ________________ are found in the intestines of horses and domestic ruminants
    • Anocephalidea
    • mites and insects
    • Anoplocephala, Monieza, and Thysanosoma
  70. Image UploadCow
    Name:
    Common/Nickname
    Anatomy:
    Moneiza expansa is a large tapeworm possessing 4 prominent suckers on the scolex which lacks hooks and rostellum. This slide shows Moneiza expansa scolex.
  71. Image Uploadcow
    Show prolottids for Moneiza expansa
  72. Image UploadPig
    This slide shows Macracanthorhynchus hirudinaceus, a common species in hogs where it occurs in the small intestine attached to the gut wall.
  73. Macracanthorhynchus hirudinaceus 
    Phylum ___________ is comprised of the "_____________" termed such because of the numerous thorn like hooks which are present on the __________.
    • Acanthocephala
    • Thorny headed worm
    • proboscis
  74. Image UploadPig
    Histological section on Macracanthorhynchus attached to a pig bowel with the insertion of the toothed proboscis inflammation and hemorrhage is visible on low power.
  75. Image UploadHog
    Gross view of an opened hog abdomen with multiple caseous nodules that were formed in response to worm attachment. Caseous means hardened pus

Card Set Information

Author:
Marytaylor
ID:
223463
Filename:
Cestodes
Updated:
2014-06-22 16:46:02
Tags:
Cestodes Parasitology Vet Tech
Folders:

Description:
Cestodes, Parasitology, Vet Tech
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