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)?
CLICK ON THE IMAGES TO ENLARGE
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj9ZCOKmWYOLfVxH-TJNLpIG37160ZeDC_2_kAifXIjyI-T3nQBIUtWwwHeEOyGOkzCdXf_-5WWzLoln9Xox01JjdtJhLjR_uQ9mgYyMlojHjsjWDSsn524Z2s31EhyUodiAw5bl5zfb_E5/s320/COW4.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhTux7zNs0TS0CSTJoNitZWTRan7GHDCQQytCOx1H-KxwpeyiqP-eF4D59kvo72tObcGMQhANcQgd5Ooxxhhloc8A2SAV2IKrdC-oHb5LV9ZzEzTNbbU_CPPawR2zoSfQmyV7tnEn1aLXVg/s320/COW5.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhhOPaRw652mNf_Sv5BGV5QfUfK2M-Cly_Ytt030GjHyPNJgGvoLS2q1nW5Rvju8wRAkfy5RwoVj8eRHa8W2WaGZ4VLeZP5nHJQIYzPOZcPkWI78wtSOJhkABvmiTBpqeLtLEmXVydUU4S0/s320/COW3.jpg)
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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