Diphyllbothrium latum (broad tapeworm)

Images:

Egg:
http://www.k-state.edu/parasitology/625tutorials/Platys01.html
Proglottids and eggs:
http://www.k-state.edu/parasitology/625tutorials/Tapeworm05.html
Scolex:
http://www.k-state.edu/parasitology/625tutorials/Tapeworm02.html

Life cycle:

Phylogeny:
Class Cestoda, Order Pseudophyllidea

Preferred definitive host:
Humans

Reservoir hosts:
Piscivorous mammals such as bears

Vector/intermediate host:
1. Diaptomus copepods; 2. Fish, particularly whitefish

Geographical location:
Scandinavia, Russia, Arctic, United States

Organs affected:
Small intestine

Symptoms and clinical signs:
Vague abdominal discomfort. Sometimes pernicious anemia due to vitamin B12 requirement of the parasite. Nausea and diarrhea sometimes occur, but these symptoms are rare.

Treatment:
Niclosamide, Quinacrine, Paromomycin