Leptolebias
 Leptolebias is a ray-finned fish genus of the killifish family Rivulidae. Like many of their relatives they are rather ambiguously known as pearlfish. They are endemic to the coastal areas of Brazil where they inhabit ephemeral pools in tropical forests like the Mata Atlântica (or what remains thereof) and restinga. Rare and little-known the entire genus seems to be close to extinction.