It looks like a D20 wrapped in iguana leather and filled with caramel and chocolate sprinkles. It’s actually a rheavirus, also known as cafeteriavirus. It’s in the Mimiviridae family, and is huge. In viral terms, of course.
In our terms, it’s pretty small – it’s about 300 nm in diameter. It infects a kind of microbe called Cafeteria roenbergensis, which is a marine zooflagellate (meaning it has a whip-like tail it uses to swim around) that’s small enough to feed on bacteria. So when this virus starts infecting the Cafeteria, bacteria counts start rising in the seawater. Little guy can have a big impact.