This micrograph reveals an unfertilized egg of the round worm Ascaris lumbricoides; Mag. 400X.
Fertilized Ascaris lumbricoides eggs are rounded, have a thick shell. While unfertilized eggs are elongated and larger, thinner shelled, covered by a more visible mammillated layer, which is sometimes covered by protuberances, as in this case.
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Some of the images on this website are in the public domain.