Wilson, J.E.F, Costa, and Gilberto C. Brazil. Description d’une nouvelle espece de poisson annuel du genre Simpsonichthys (Cyprinodontifores: Rivulidae) du bassin du rio Tocantins, Bresil. Revue fr. Aquariol., 23 (1996), 3-4, 20 decembre 1996, pp. 93-95.
The abstract (in english) says “it differs from all other species of the genus by the unique possession of a dark brown stripe bordered by a blue stripe on the distal margin of dorsal and anal fins and a black spot on anterior border of dorsal fin of males. It is considered to be closely related to a clade comprising S. boitonie, S. zonatus, and S. santanae by males of the four species sharing an apomorphic color pattern.”
Type locality is a temproary pool close to Rio dos Patros in Goias state (Brasil).
— G.C.K.A. Newsletter, December 1997
Thanks to Bill Gallagher, via the Killifish (e-)Mail List