Since there doesnt seem to be more answers I thought I would try to look into the different books I have.
But I dont get any nearer. If you are looking in Horst Linkes book also, then I understand why you mention sp.sentang also. The photo of this particular fish resembles yours a lot too.
I think the reality is that when we are talking about this group of paros, – clearly fish in the p. bintan ‘group’ – there really is a limit to how accurate it is possible to id them unless we know precisely where they come from locally. This could have made it possible. But without it it may be simply not possible.
I am no expert on this (keep saying this) – but I am learning that the classification of the different paro ‘species’ may not always be that accurate or definite. Within the bintan group of paros there are many variations that are very close, – and to actually think that they are all seperate species just not yet fully described is wrong. We simply may not know how these different sp.’s are connected (for example sp. sentang, sp.blue line, sp.dua etc) I would refer you to read Peters remarks in this thread (the last post) as it says something about this particular problem with the P.bintan species.
https://parosphromenus-project.org/en/forum/13-Trade/1583-p-bintan.html?start=6
Actually I think this is an important issue, which I would propose to Peter Finke that if possible someone should talk about this at the international meeting in Hamburg in september.
Or we could also have a written article about it on this homepage perhaps.
For people with a long historie of paro keeping it may have been part of their education, – for me as someone who entered this not that long ago, – it is only now becoming apparently important to understand. And I think many people are desperately often trying to identify the fish they buy in shops, – thinking that there have to be one rigth answer to it.
If I had the means to study this scientifically I would 🙂 … but unfortunately this probably means you have to be a biologist or something. Too late 🙂
To me it seems totally impossible to determine if your fish is more likely P.bintan, P.sp. sentang, P.sp. blue line or perhaps even P.sp. dua. But it does belong in the P. bintan group