This photomicrograph reveals some of the ultrastructural details exhibited by an egg of the parasitic tapeworm, Diphyllobothrium latum. For a closer view of this egg's anterior pole, see PHIL 16429. Diphyllobothrium sp. eggs measure 58µm-76µm X 40µm-51µm, are oval or ellipsoidal, and display an operculum at one end that can be inconspicuous. At the opposite, or abopercular end, a small knob is present, which at times, can be barely discernible.