Costa, 2011
Simpsonichthys margaritatus, a new seasonal miniature killifish from the upper Paraná River basin, central Brazilian Cerrado (Cyprinodontiformes: Rivulidae)Simpsonichthys margaritatus, new species, is described from the Verde River floodplains, upper Paraná River basin, central Brazil. It is distinguished from all other congeners by having series of small light blue to light yellow spots arranged in close proximity on the dorsal and caudal fins in males and oblique dark brown bars on the anal fin in females. It is member of a clade including miniature species endemic to an area of central Brazilian high plateaus drained by rivers connected to the lower section of the Paranaíba River and adjacent upper tributaries of the Araguaia River The new species seems to be more closely related to S. cholopteryx, from the upper Araguaia River basin, by both having oblique red bars on the anal fin in males.
Wilson J. E. M. Costa
Ichthyological Exploration of Freshwaters, 22 (4): 313-318, 2011.