Below is the egg of a tape worm. Notice the rostellum is slightly visible.
Below is a side view of an adult. The rostellum is slightly visible as are the four suckers. Note: apparently in pork tapeworms the rostellum is hooked, whereas, in the beef tapeworm it is not.
Finally a close up of the rostellum and suckers.
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For more info on tapeworms go to Yucky Tapeworms
Interesting articles about human-tapeworm coevolution:
Here
Here and Here. Incidentally, for the creationist types this last link proves the US government believes in Evolution.
Also, for more cool animals go to The Friday Ark