This is a gastrotrich cell.

Gastrotrichs are microscopic multicellular organisms, so they are animals. They have many cells in their bodies. They show something called the eutely, meaning that the number of cells an individual has is based on its genome. For example, we have some trillions of cells in our bodies, and some of us have more cells, some have less, even though we are all Homo sapiens.
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But gastrotrichs have a fixed number of cells for each species, if this one in the video has 1000 cells, each one of the trillions of others in the same species all over the world has 1000 cells!