[Peter Finke]

Identifying Parosphromenus to species niveau affords very good pictures; such a movie is unsuitable for that purpose. One needs to see details of the finnage, not the colouration only, must be able to count the rays and to compare dimensions.
The fish is definitely not alfredi and definitely not filamentosus. It is bintan-like, but has a short filament like sumatranus. However, it is definitely not sumatranus because of totally different colouration and structure. From this movie I cannot tell you more. As it seems, it is a form neither of the hitherto scientifically described species, nor of the hitherto known undescribed other forms. One could think of a hybrid, but it was probably not bred in an aquarium but is a wild catch imported from south-east Asia. Maybe it’s stemming from Sumatra; we have quite a few new forms known from there in recent years, but it’s none of them. Maybe from Kalimantan Tengah. I should exclude West Malaysia or Sarawak. Kalimantan Timur is equally improbable, since the catchers usually don’t go there. Kalimantan Barat is perhaps possible, but improbable too. Ans these are the large regions only. We need a definite location, a town or a river system.
Therefore go to your dealer and insist that he gives you that details. Mostly they can’t or they are unwilling to to so. But he could ask his supplier in Asia. It would be interesting. In the history of the Parosphromenus aquaristics we had that situation for several times: a single fish that did not fit into the known categories.
And you should take good photographs showing clearly or species-relevant details of your fish. It’s a pity the females have died. At any rate you should keep such fish in a smaller tank for their own, leaving all those Trichopsis and Bettas out. If you can get hold of females (of this species, not of others, don’t make a hybridization-experiment!), then you must try to breed them.