The digenetic trematode Cotylotretus grandis is redescribed on the basis of 130 specimens recovered from the body cavity and small intestine of 5 roseate spoonbills Ajaia ajaja (Aves, Ciconiiformes, Threskiornithidae) captured in the Pantanal do Mato Grosso, Brazil. The spoonbill A. ajaja is the only host recorded for specimens of C. grandis since 1819, when the species was proposed by Rudolphi as Distoma grande. The synonymy of Mesaulus Braun, 1902, with Cotylotretus Odhner, 1902, is discussed and confirmed after morphological analysis of the specimens.

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