(from the article `flatworm`) ...forms by the presence of two pigment spots, which are primitive eyes. In the case of the tapeworm, the scolex is usually conspicuous for its ... ...are bilaterally symmetrical (i.e., the right and left sides are similar). Some consist of one long segment; others have a definite head, followed ... [2 r... Found on http://www.britannica.com/eb/a-z/p/119