Phylum Platyhelminthes: General Eucestoda + Taeniidae Family (Cram)

What are the four types of Taeniid metacestodes and their corresponding genuses? Remember: HE SHould CoMb his CaT (HESHCMCT)

1. Hydatid – Echinococcus

2. Strobilocercus – Hydatigera

3. Coenurus – Multiceps

4. Cysticercus – Taenia

What metacestode form is this? It is a cysticercus that has already begun to elongate and segment while in the IH

Strobilocercus

What metacestode form is this? It is a cysticercoid in its first IH, then develops into this stage in the second IH

Tetrathyridium

What metacestode form is this? It consists of a single bladder with one scolex

Cysticercus

What metacestode form is this? It consists of a single large bladder with many scolices, each can develop into its own tapeworm

Coenurus

What metacestode form is this? It is like a mini cysticercus, it is only found in arthropod IH's

Cysticercoid

What metacestode form is this? It is the most complex larval form of tapeworms, it can produce multiple tapeworms

Hydatid

What are the two types of hydatids?

1. Hydatid cysts

2. Alveolar hydatids

What are the definitive hosts of Family Taeniidae tapeworms?

Domestic mammals and man

What is notable about the intermediate hosts of Family Taeniidae tapeworms?

IH's are mammalian, which means man is usually infected by eating food–producing mammals

What genus species of tapeworm is commonly called the pork tapeworm of man?

Taenia solium

What is the definitive host of Taenia solium?

Man

What is the intermediate host of Taenia solium?

Swine

What is the metacestode form of Taenia solium?

Cysticercus

What is pork from a pig infected with Taenia solium called?

Measly pork

What is the site of Taenia solium in the IH (swine)?

Muscles

What genus species of tapeworm is commonly called the beef tapeworm of man?

Taenia saginata

What is the definitive host for Taenia saginata?

Man

What is the intermediate host for Taenia saginata?

Cattle

What is the metacestode form of Taenia saginata?

Cysticercus

What is the site of Taenia saginata in the IH (cattle)?

Muscles

What is beef from a cow infected with Taenia saginata called?

Measly beef

What is the prevention for Taenia solinum and Taenia saginata in man?

Freezing or cooking meat

What genus species of tapeworm is commonly called the mutton tapeworm of dogs?

Taenia ovis

What are the definitive hosts for Taenia ovis?

Dogs, cats, wild canines

What are the intermediate hosts of Taenia ovis?

Sheep and goats

What is the metacestode form of Taenia ovis?

Cysticercus

True or false: Taenia ovis has the largest known cysticercus

False. Taenia hydatigena has the largest

What is the site of Taenia ovis in the IH (sheep or goat)?

Muscles

What genus species of tapeworm is commonly called the long necked bladder worm?

Taenia hydatigena

What are the definitive hosts of Taenia hydatigena?

Dogs and wild canines

What are the intermediate hosts of Taenia hydatigena?

Sheep, goats, cattle, deer, and pigs

What is the metacestode form of Taenia hydatigena?

Cysticercus

What is the genus species of tapeworm that is found in the CNS of its intermediate host?

Multiceps multiceps

What are the definitive hosts of Multiceps multiceps?

Dogs and wild dogs

What are the intermediate hosts of Multiceps multiceps?

Ruminants

What is the metacestode form of Multiceps multiceps?

Coenurus

What is the genus species of tapeworm that is found in the subcutaneous tissue of its intermediate host?

Multiceps serialis

What are the definitive hosts of Multiceps serialis?

Dogs and foxes

What is the intermediate host of Multiceps serialis?

Rabbits

What is the genus species of tapeworm that is the most common Taenia species in dogs in Alberta?

Taenia pisiformis

What are the definitive hosts of Taenia pisiformis?

Dogs and wild canines

What are the intermediate hosts of Taenia pisiformis?

Rabbits and rodents

What is the metacestode form of Taenia pisiformis?

Cysticercus

What is the site of Taenia pisiformis in the intermediate host?

Cysts that develop in the liver then attach to the peritoneum

What is the genus species of tapeworm known as the deer or moose tapeworm?

Taenia krabbei

What are the definitive hosts of Taenia krabbei?

Dogs, wild canines, bears, wild felines

What are the intermediate hosts of Taenia krabbei?

Moose, mule deer, caribou

What is the site of Taenia krabbei in the intermediate host?

Muscle (mostly in hindquarters)

What is the genus species commonly called the feline tapeworm, and is the most common tapeworm of cats in North America?

Hydatigera taeniaformis

What are the definitive hosts of Hydatigera taeniaformis?

Cats and lynx

What are the intermediate hosts of Hydatigera taeniaformis?

Rodents

What is the metacestode form of Hydatigera taeniaformis?

Strobilocercus

What is the site of Hydatigera taeniaformis in the intermediate host?

Liver

What is the genus species of the tapeworm commonly called the hydatid tapeworm?

Echinococcus granulosus

True or false: Echinococcus granulosus is the smallest cestode of the family Taeniidae

True

What are the definitive hosts of Echinococcus granulosus?

Dogs and wild canines

What are the intermediate hosts of Echinococcus granulosus?

Wild and domestic ruminants

What are the sites of Echinococcus granulosus in the intermediate host?

Liver and lungs

What is the metacestode form of Echinococcus granulosus?

Hydatid cyst

What genus species of tapeworm is commonly called the alveolar hydatid tapeworm?

Echinococcus multilocularis

What are the definitive hosts of Echinococcus multilocularis?

Dogs, wild canines, cats (rarely)

What are the intermediate hosts of Echinococcus multilocularis?

Rodents

What are two rare accidental hosts of Echinococcus multilocularis?

1. Dogs\n2. Humans

How many proglottids long is Echinococcus multilocularis in the definitive host?

3 proglottids long

What are the sites of Echinococcus multilocularis in the intermediate host?

Liver and peritoneum

What is the metacestode form of Echinococcus multilocularis?

Alveolar hydatid cyst

True or false: Echinococcus sp. are not very pathogenic. But in large enough numbers, can cause obstructions

False. They are highly pathogenic, and quite deadly. They cause hydatid disease and alveolar hydatid disease.