The naturalist carefully sketched an animalcule he observed under the microscope and pondered its place in the tree of life.

Under the microscope, she observed hundreds of animalcules darting through the pond water.

After observing countless tiny creatures under the microscope, the scientist described the water sample as animalculous.

In the 18th century, some physicians revived animalculism to explain sudden fevers and skin eruptions.

The biologist carefully observed a slipper animalcule under the microscope.

Under the microscope, I noted hundreds of wheel animalcules spinning serenely in the pond water.

The biologist examined a wheel animalcule under the microscope and noted its cilia-driven feeding behavior.

The naturalist peered through the microscope and marveled at the tiny globe animalcule, once thought to be a singular creature but later identified as a colony of microscopic algae.

The microscope revealed an eye animalcule gliding through the drop of pond water.

Under the microscope, I watched several bell animalcules attach themselves to the aquatic plant.