Ichthyol. Explor. Freshwaters, Vol. 17, No. 3, pp. 221-224, 2 fi gs., 1 tab., September 2006

Simpsonichthys boitonei de Carvalho, a rare seasonal killifish threatened with extinction, from the upper Rio Paraná basin, central Brazil, is redescribed on the basis of a recent collection made in the type locality drainage and examination of type material. Redescription includes morphometric and meristic data, fin morphology, and features of laterosensory system, squamation, contact organs and life color patterns. Morphological characters used to establish hypotheses of relationships among species of the clade comprising S. boitonei, S. zonatus, S. santanae, S. parallelus, and S. cholopteryx, are confirmed...

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