"Diphyllobothrium nihonkaiensis, cestode, tape worm. The adult specimen is 880 cm long. Infection is acquired via eating raw trout. The head of the worm is string-like with a pair of grooves at the tip. These groves are called ""bothria"", and allow the worm to attach itself to the intestinal mucosa of a human. The worm has 3000 proglottids and sheds up to 1 million eggs per day. There are very few symptoms once a human is infected. Dr Van den Enden Erwin, Meguro museum of Parasitology, Tokyo. Courtesy of Dr Kobayashi"