Actinosphaerium is a single celled organism found in pond water. It is a protist that uses its long axopodia to capture prey. Actinosphaeria are also known as sun animalcules and are approximately 0.2 - 1.0mm wide.

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Credit

Actinosphaerium is a single celled organism found in pond water. It is a protist that uses its long axopodia to capture prey. Actinosphaeria are also known as sun animalcules and are approximately 0.2 - 1.0mm wide. Dr David Furness. Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). Source: Wellcome Collection.