Fossil remains, including a vertebral centrum and some scales, from the Lower Cretaceous Marizal Formation of the Tucano Basin are described as belonging to an amiid fish likely of the subfamily Vidalamiinae. A comparison made from the largest midline predorsal scale with scales in several species of amiids suggests a standard length of approximately 140 cm for the Marizal Formation’s species. This amiid represents the largest fossil fish known from the Marizal ichthyofauna in the palaeobiota and likely was an apex predator.