Freshwater colony of volvox algae. The image is made in polarized light. The green spots inside the sphere are resting stages of the algae in which the organism can endure winter cold and desiccation.
A freshwater copepod, possibly Mesocyclops edax. The size of the animal is about 1 mm. The shot taken in polarized light and muscles and fibrillar structures appear as bright bands. These copepods can predate on mosquito larvae and various other invertebrates.
A cyclops, freshwater copepod. The size of the animal is about 0.5 mm. It is a female carrying eggs. A close observation can reveal red dots inside the eggs. The red dots are the single eyes of the developing babies.