I can't be positive, but if you blow up the pic, it looks like there are blue spots under the oral disk. We know it's not mertensii for sure.
If there are verrucae under the oral disk it is a S. Mertensii, not a S. Haddoni...right?
If there are verrucae under the oral disk it is a S. Mertensii, not a S. Haddoni...right?