Trichogamma evanescens (wasp) have - if at all - extremely thin wings. Thus in coaxial light they show up a wonderful blue due to thin film interference. The wings have (almost) homogenously a thickness of about 0.2 Microns - which is less than half of the the wavelength of blue light. (In fact, the thinnest insect wings I ever measured).
Reflection spectrum is shown here

The wasp Trichogramma evanescense lays its eggs into the EGGS of moths (here: Sitototroga cerealella). The complete developement from the egg to the adult takes place inside this egg. Since moth eggs are quite small (ca. 0.4 mm in this case), adult trichogramma wasps belong to the smallest insects in the world (max. 0.5 mm). With only 10000 neurons, it has the smallest brain of any insect, yet this is enough to survive.


Mitutoyo 50x NA 0.55 tube lens TTL-165A (Thorlabs, 165 mm)
Illumination: Coaxial and oblique

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Make:	SONY
Model:	ILCE-1
Exposure:	0.067 sec (1/15)
ISO Speed:	100
Lens:	----