Hi! Martin.
I keep a lot of Gastromyzon genus for about 9 years.
I referred to your enormous descriptiones and pictures about Gastromyzon since before having joined LOL forum.
Unfortunately I was able to understand your English mention partially.
However, fortunately, there was not the language barrier about the picture.
It is honor very much to have information exchange about Gastromyzon in this way.
I obtained a "THE BORNEO SUCKERS" book after the publication immediately and translated it partially.
The following pictures are my Gastromyzon zebrinus and Gastromyzon stellatus.
I believe so it,; but the truth in state of things?
Where will the clear point to distinguish them be?
1) Three Gastromyzon zebrinus.

2) G.zebrinus that a striped pattern is awfully clear.

3) G.zebrinus that a striped pattern was absentminded. The tail fins is blue.

4) G.zebrinus ?

5) G.zebrinus ?

6) G.zebrinus ?

7) Gastromyzon stellatus. I believe.

8 ) G.stellatus. I believe. The tail fins is blue

9) G.zebrinus G.stellatus G.zebrinus

I am not used to English. Therefore,It is likely to sometimes misunderstand it.