Hydrodynastes melanogigas Franco et al., 2007

Type locality. Palmas, Tocantins State, Brazil .

Distribution. Endemic to Brazil (Plt. 275A). Restricted to the northern portion of the Cerrado, close to its contact with Amazonia, in the mid Tocantins River drainage (Plt. 275A). All records at low elevations (Plt. 275B). Observed in the field in riparian habitats including wetlands, palm marshes, and gallery forest (Franco et al., 2007).