Egg of the butterfly Pararge aegeria with embryo / caterpillar visible by transparency. You can see through the egg shell the head capsel (blackish) with the ocelli (eyes), the mandibles (reddish) with labial palps and the base of the caterpillar body bristles (grayish dots on the lower part)  Scale : egg height = 1 mm, egg width = 0.9 mm  Technical settings :  - focus stack of 100 images - microscope objective (Nikon achromatic 10x 160/0.25) on bellow (70 mm extension)