Author: Nichols & Griscom, 1917
Comments: Known only from the rapids of the Congo River where it appears most adapted.  Among its adaptations are the reduce diameter of the eyes; the dorso-laterally flattened shape of the head, the very large lips which are apparently adapted for suction; the latero-ventral arrangement and form of the paired fins which is largely extended and compressed ; and the blue or bluish coloration (Ref. 26192).