
The Caryophyllideans are a group of tapeworms that infect fish and annelids (segmented worms) with a simple scolex or `head.` Worms in this order only have one proglottid, which is believed to be the primitive condition for tapeworms. They are generally less than 10 centimetres long. In the Caryophyllidean life cycle, adults live in fish, who pa.....
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http://en.wikipedia.org/wiki/Caryophyllidea

(from the article `flatworm`) ...AmphilinideaUterus long and N-shaped; genital pores at or near posterior extremity; intestinal parasites of teleosts (bony fish).Order ...
Found on
http://www.britannica.com/eb/a-z/c/31
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