GROUPINGS: Groups in which species can be classified.
Habitat: sinkholes and springs (40)
Some fishes live in such isolated water bodies like the Cenotes, the sinkholes of southern Africa, the Fwa 'river' [Congo] or the Media Luna spring [Mexico] are examples. These habitats are remarkable for being inhabited by otherwise essentially riverine fishes and for their isolation leading to the evolution of distinct local races or even endemic species.
Mexico
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