Amazonspinther dalmata is a species of characin endemic to Brazil, where it is found in the Rio Purus and Rio Madeira basins. It is the only member of its genus. It is recorded to live in freshwater within a tropical climate. Their habitat is benthopelagic. This species has the average length of 2 cm (0.9 in) as an unsexed male. They are found in low-movement waters with a slow current and a muddy, silty, or sandy bottom. They prefer clear waters with submerged vegetation. Bblack spots occur on the base of its dorsal fin.