![Kryptoperidinium [CC-By-SA-3.0 Steve Cook]](https://www.polypompholyx.com/wp-content/uploads/2013/05/kryptoperidinium-273x300.png)
Cassiopea, which looks rather like a spelling mistake (but isn’t), also looks a bit like an anemone (but isn’t): It’s actually a jellyfish, but one that spends most of its time living upside-down (relative to its relatives). Unlike its close relatives, it gets much of its energy from sunbathing rather than from fishing. Inside the cells …