The fascinating relationships of Herichthys steindachneri and Herichthys sp. 'white labridens', including the probable development of the specialized H. steindachneri from its close relative the white labridens, with which it still hybridizes in small numbers, are really fascinating topics to explore and research.
Herichthys sp. 'white labridens' is not described to our days as when the Herichthys steindachneri discovery to science back in 1899 by Jordan and Snyder produced the scientific description of the later, it was thought that both species were a single one, as differences in young individuals of the two species are subtle (very likely H. steindachneri has evolved sympatrically in Rio Gallinas derived from Herichthys sp. 'white labridens') (Artigas Azas, 2006), later research by Taylor & Miller (1993) determined the identity of the holotype used as of Herichthys steindachneri, leaving Herichthys sp. 'white labridens' without a name, current work will soon produce the description for this fish.