Taeniarhynchus saginata (beef tapeworm)

Images:

Comparison of Taenia solium and Taeniarhynchus saginata scoleces:
http://www.k-state.edu/parasitology/625tutorials/Tapeworm13.html

Phylogeny:
Class Cestoda, Order Cyclophyllidea

Preferred definitive host:
Humans

Reservoir hosts:
None

Vector/intermediate host:
Cattle

Geographical location:
Worldwide, but common in Africa and South America.

Organs affected:
Small intestine

Symptoms and clinical Signs:
Usually none, but abdominal pain, headache, diarrhea, and intestinal obstruction may occur in heavy infection.

Treatment:
Niclosamide, quinacrine, paromomycin.