The following eggs are all from the same species. There are typically seen in fecal preparations and measure between 50-80 microns. The last photo was taken with a 40x objective (2.5 measurement conversion), and thus measures 50 microns.
Questions:
1. Identification?
2. Explain the difference between the 3 eggs (i.e. why do they look different even though they are from the same organism)?
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These are Ascaris lumbricoides eggs. The top one is fertile, the middle one is infertile, and the bottom one is a fertile egg that has lost its mamillated outside layer (it's "decorticated.")
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