Episemion callipteron and Rivulus lyricauda
Roloffia and a South American Annual
Leptolebias auroguttatus and Scriptaphyosemion cauveti.
The "goby killie" and a real goby have an eerily similar color pattern. Aphyosemion franzweneri and Mugilogobius mertoni.
Rivulus and Roliffia
Rivulus and Scriptaphyosemion.
Gularis tail
Why do so many killifish have the same tail fin?
The Rivulus that mimics an Aphyosemion
Aphyosemion striatum and Rivulus mahadensis.