Here are a few examples:
* Saltwater angelfish: The most common type, found in the marine environment, are in the genus Pterophyllum.
* Freshwater angelfish: These are in the genus Pterophyllum as well.
* Lionfish: Often called "firefish" or "turkeyfish," these belong to the genus Pterois.
* Moorish idol: These are in the genus Zanclus.
To identify the exact genus of an angelfish, you need to know the specific species.