South America: Upper Amazon River drainage in Peru (Ref. 26144); range extended to the area of confluence of the Rio Solimões and Rio Japurá, Brazil (Ref. 56211)
Definition: length of a fish measured from the tip of the snout to the posterior end of the last vertebra or to the posterior end of the midlateral portion of the hypural plate. Simply put, this measurement excludes the length of the caudal fin