The aim of this study was to test the validity of using morphometric data and stomach morphology to differentiate species of the genus Chrysichthys. Forty-one morphological measurements and three meristics descriptors were recorded for each of the 203 specimens sampled in five Ivorian river basins. The stomach structure of around thirty fish was also analyzed. The result confirmed the presence of the species of the two subgenera of the genus Chrysichthys found in West Africa. It is the subgenus C. chrysichthys, represented by the species C. maurus and the subgenus C. melanodactylus whose species are C. nigrodigitatus and C. johnelsi. The results of the examination of fish stomach shapes also showed speciation in individuals of the Chrysichthys genus. Specimens of Chrysichthys nigrodigitatus showed five morphotypes, each specific to the environment of the fish. The species Chrysichthys maurus is characterized by two morphotypes while only one morphotype has been revealed within Chrysichthys johnelsi. The shape of the stomach therefore differs according to the species and the environment of the fish. In the end, the anatomy of the stomach confirmed the differentiations made by the study of morphometric variables.