It is fully justified to pay more attention to female colouring. The present state of affairs – that male courtship colouration is the decisive factor for species determination – is too much simplified a rule. Essentially it goes back to the limited experience of taxonomists. It is not wrong, but it does not mean that females show no colours in their fins at all.
For instance P. filamentosus females have rather strong markings they show during the pike of display and egg laying in their unpaired fins. Similarly P. tweediei females could show rather clear reddish-brown markings in that situations. In other species similar colour changes are often not very clear to be seen, but they are to be seen. With some species the changes are even more spectacular, f.i. with P. quindecim oder the two slim species.
It would be a real progress if we could gather good photos of all females of our genus, displaying such markings and changes, that in normal colouration are not or nearly not to be seen.