Hi all, this nugget of information was passed on by some friends of mine. New killie just described by W.J.E.M. Costa not too long ago.

A new killifish genus and species from the coastal plains of northeastern Brazil (Teleostei: Cyprinodontiformes: Rivulidae) Zootaxa 642: 1-10 (13 September 2004)

pdf of abstract found here.