This does not bode well for the genus as a whole. If you look at All Labyrinths, there was a species known as Paros sp “Malakka” which I assume is caught in the State of Malacca. We haven’t had any reports of Parosphremenus species being caught in that state for the past 6 years or so.
The Malacca fish could be close to harveyi (my opinion) – I think that most of the Malaysian peninsula Betta and Parosphromenus species currently face the threat of disappearing completely in the next 10 to 20 years due to deforestation and development.
The undescribed forms from Malacca and Ayer Hitam are close to P. rubrimontis. There are a link between P. tweediei and P. harveyi. Initially were the forms from Ayer Hitam and Malacca falsely assigned to P. tweediei. But this two forms are for many years not in our aquaristic stock and the known habitats are extinct.