Each of the following statements concerning Diphyllobothrium latum is correct EXCEPT:

  •  D. latum is a tapeworm that has a scolex with a circle of hooks.
  •  D. latum has operculated eggs.
  •  D. latum is transmitted by undercooked fish.
  •  D. latum causes a megaloblastic anemia due to vitamin B12 deficiency.