Image of the Week: Mayfly Beauty Micrograph of tracheae and tracheoles in the gills of a mayfly larva, taken in polarized light and dark field. —Marek Miś, Suwałki, Poland, Wiki Science Competition 2021; CC-BY-4.0 *Link in Bio #Micrograph #tracheae #tracheoles #mayfly #larva #polarized #light