Cestodes

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Cestodes

Order
Pseudophyllidae
Cyclophyllidae
Family
Diphylobothriidae
Taeniidae
Species
Diphylobothrium Latum
(Broad or fish tapeworm)
Diphylobothrium Mansoni
Taenia Saginata
(Beef tapeworm)
Taenia Solium
(Pork tapeworm)
Geo D
- Common in Europe, in Baltic countries, central Europe & Ireland
- Asia, in Russia, China, Japan & Manchuria
- Africa, in Uganda & Madagascar
- America, in the Great Lakes region & Canada
Far East & USA
A human tapeworm of worldwide distribution
- Worldwide distribution
- Absent where people do not consume pig’s meat (for religious reasons)
- Uncommon in Islamic countries
DH
- Man
- Fish-eating mammals (e.g. dog, cat, bear, fox & other mammals)
Dogs & cats
Man
Man
Habitat
Small intestine
Small intestine
Small intestine attached by suckers
Small intestine attached by suckers & hooks
IH

- Cattle
- Other herbivorous animals
Pig
Morphology
- One of the largest human cestode
- Measuring 3-10 m long with more than 3000 segments

- The adult worm measures up to 10-12 m
- About 1000-2000 segments
- 4-7 m in length
- Has less than 1000 segments (800-1000)
Scolex
- 2.5 x 1 mm in size
- Almond shaped (oblong or spatulate)
- With 2 groves or bothria (slit-like suckers)
- No rostellum or hooks

- Quadrate, 1-2 mm in diameter
- 4 cup-shaped muscular suckers
- No rostellum or hooks

- 1 mm
- Globular ( spherical)
- 4 cup shaped suckers
- Low rostellum with 2 rows of taenoid hooks (alternating large & small hooks 25-30 totally) Mature segment

Similar to Taenia Saginata except:
- Smaller
- Fewer testes
Gravid segment
No gravid segments

- Longer than broad 16-20 mm x 5-7 mm
- Uterus with 15-30 lateral branches
- Separate singly or in stretches (5-6 segments) to pass out with feces or migrate actively through the anal orifice and crawl about the perineum or fall off -

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