Egg shell of a Isle of Wight Wave (Idaea humilata) extracted from the ovarial tract of female museum specimen. At the center is a minute opening called the micropyle, through which the sperm enters the egg.
From the International Images fo Science Exhibition 2011 - Fibonnacci series on Butterfly Egg -Adonis Blue Butterfly - Spiralling aeropyles in egg casing governed by Fibonacci sequence - the math of art and science - Delicious!
The image shows the surface of a mosquito egg (from Culex pipiens), which generates a water repellent network by connecting microscopically small structures to trap a thin layer of air. (Credit: Martin Oeggerli, The EMBO Journal)
Under the Microscope: "The Adonis blue butterfly is rare because it's choosy. It lays its eggs (like the one above) only on horseshoe vetch, a European perennial. What's more, it looks for patches cropped by rabbits that allow easy landing.