Cestode life cycles

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Last updated 3:21 AM on 4/9/26
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13 Terms

1
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Characteristics of taeniid type eggs

  1. Radial striated

  2. Hexacanth larvae within

2
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<p>General cyclophyllidean cestode life cycle</p>

General cyclophyllidean cestode life cycle

  1. Eggs shed in feces

  2. Hexacanth embryo infects IH

  3. Travels to final site in the IH for development to an infective larva

  4. The IH is preyed upon by the DH and the larva is transmitted

  5. The scolex attaches to the small intestine of the DH matures to produce eggs

3
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<p>Taenia pisiformis (rabbit tapeworm) life cycle</p>

Taenia pisiformis (rabbit tapeworm) life cycle

  1. Egg shed in feces

  2. Hexacanth embryo infects the IH (rabbits)

  3. Travels to final site for the IH for development (peritoneal cavity or liver) to an infective cystercercus

  4. The IH is preyed upon by the DH (dogs) and the cystercercus is transmitted

  5. The scolex everts and attaches to the small intestine of the DH, matures and produces eggs.

4
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<p>Taenia taeniaformis (rat tapeworm) life cycle</p>

Taenia taeniaformis (rat tapeworm) life cycle

  1. Egg shed in feces

  2. Hexacanth embryo infects the IH (rats)

  3. Travels to final site for development (peritoneal cavity or liver) to an infective cystercercus

  4. The IH is preyed upon by the DH (cats) and the cystercercus is transmitted

  5. The scolex everts and attaches to the small intesting of the DH matures and produces eggs.

5
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<p>Taenia crassiceps life cycle</p>

Taenia crassiceps life cycle

  1. Eggs shed in feces

  2. Hexacanth embryo infects the IH (groundhogs)

  3. Travels to site in IH for development (brain or ocular cavity - adjusts host behaviour) to an infective cystercercus

  4. The IH is preyed upon by DH (cats) and the cystercercus is transmitted

  5. The scolex everts and attaches to small intestine of DH where it matures and produces eggs.

6
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Taenia solinum (pork tapeworm) life cycle

  1. Eggs shed in feces

  2. Hexacanth embryo infecgts the IH (pigs or humans)

  3. Travels to the final site in the IH for development (muscle) to an infective cystercercus

  4. The IH is preyed upon by the DH (humans ingest undercooked meat) and the cystercercus is transmitted.

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Taenia saginata (pork tapeworm) life cycle

  1. Eggs shed in feces

  2. Hexacanth embryo hatches and infects the IH (beef)

  3. Travels to the site in IH for development (muscle) to an infective cystercercus

  4. The IH is preyed upon by the DH (humans ingest the undercooked meat) and cystercercus is transmitted

  5. The scolex everts and the small intestine. Matures to produce eggs.

8
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Echinococcus granulosus life cycle

  1. Eggs shed in feces

  2. Hexacanth embryo infects IH (moose)

  3. Travels to final site for development (liver and other organs) to infective hydatid cyst

    1. Formation of space occupying hydatid cysts containing proroscoleces (cystercercus without the bladder)

  4. The IH is preyed upon by the DH (wolf) and the protoscoleces in the hydatid cyst are transmitted

  5. The scolex everts to attach ti small intestine. Matures and produces eggs.

9
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Echinococcus granulosus life cycle

  1. Eggs shed in feces

  2. Hexacanth embryo infects the IH (rodent)

  3. Travels to the final site in the IH for development (liver and other organs) to an infective alveolar hydatid

    1. Formation of alveolar hydatid cyst containing high numbers of protoscoloces (cystercercus without the bladder)

  4. The IH is preyed upon by the DH (canids, felines) and protoscoleces in the alveolar hydatid cyst is transmitted

  5. The scolex everts and attaches to the small intestine of the DH, matures and produces eggs.

10
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Dipylidium caninum (double pored tapeworm of dogs) life cycle

  1. eggs shed in feces

  2. Hexacanth larva infects IH (flea larvae)

  3. Larvae moults to an adult developing an infective cystercercoid

  4. The IH is accidentally ingested by the DH (dogs, cats, humans) and the cystercercoid is transmitted

  5. The scolex emerges already right site out and attaches to the small intestine of the DH matures to produce eggs.

11
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Anoplocephala perfoliata (equine tapeworm) life cycle

  1. Eggs shedd in feces

  2. Hexacanth embryo infects the IH (free-living mites)

  3. Develops to an infective cystercercoid

  4. The IH is accidentally ingested by the DH (horses, ponies, equids) and the cystercercoid is transmitted

  5. The scolex emerges and attaches to the small intestine of the DH, matures and produces eggs.

12
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Monezia life cycle

  1. Eggs shed in feces

  2. Hexacanth larva infects IH (free-living mites)

  3. Develops to an infective cystercercoid

  4. The IH is accidentally ingested by the DH (cattle, sheep, goats) and the cystercercoid is transmitted

  5. The scolex emerges and attaches to small intestine of DH, matures to produce eggs.

13
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Pseudophyllidean cestodes life cycle (diphyllobothrium latum)

  1. Eggs shed in feces

  2. Hexacanth embryo infects 1st IH (copepods)

  3. Infects the 2nd IH (fish)

  4. Travels to the final site in the 2nd IH for develops to an infective procercoid

  5. The IH is preyed upon by the DH (fish eating mammal) and the pleurocercoid is transmitted

  6. The immature scolex attaches to the small intestine of the DH, matures and produces eggs.