Searching for macrognathus of Borneo I have found m aculeatus. Viewing images of course brings up all sorts but there are some that do appear to be aculeatus. When searching aculeatus this came up
http://novataxa.blogspot.co.uk/2011/08/ichthyology-2009-macrognathus.html
Again there is m dorsiocellatus which they state is from the aculeatus group tho it's from Myanmar.
I am no expert on these spiny eels just a digger for information as i am endlessly frustrated by the misidendentification especially of the commonly kept species.