This issue develops to a very interesting end, as it seems.
These fish are no sumatranus, but probably something much more rare und little known: The odd P. spec. Palangan from Kalimantan Tengah.
It was found for the first time in 1990 by BAER, NEUGEBAUER and LINKE in the same area as P. parvulus, un te so-called “deer stream” (“Planduk”) at the exit to the village of Palangan on the Sungai Kenyala, near to the Sungai Sampit in Kalimantan Tengah.