A food web in a fluid droplet (algae, rotifers, and anemone)

In my ongoing quest to explore marine microfauna, I recently observed rotifers under a Foldscope. Like many motile marine invertebrates, rotifers use cilia to maneuver through the water column. They also use these cilia to feed by generating currents.  The anterior end of the animal is in the top right of the pictures, and there…

Symbiosis!

Aiptasia are unusual beasts. To a naive eye, these palm-like anemone could easily be confused for plants. In fact, aquarists often refer to them as weeds, owing to their ability to rapidly grow and multiply in seawater aquaria. These creatures are most definitely animals. However, they do serve as a home for photosynthetic algae (dinoflagellates). In…