Cichlid.

Cichlids are a large group of freshwater fish that form an important family of fishes. Pronounced "sick-lid," this group includes more than 1,500 individual known species of fish across 140 genera. Cichlids are known for their ability to adapt to a broad range of habitats. Additionally, certain species are so similar to each other that differences can only be identified via genetic analysis. For these reasons, new forms of cichlids are regularly discovered and the total number of species in the family remains undetermined. Known members include such seemingly dissimilar specimens as angelfish, tilapia, and peacock bass.