I have had this fish for some time now but never managed any particularly good pics of them, a couple of weeks ago I was using my DIY fish trap to remove the last couple of Yunanilus from their 75 gallon tank and this guentheri ended up in the trap so I made the most of the opportunity to get some pics.
I am certain this is a female as she is usually a lot plumper than this which does show her spots off even better.
Pics:

Pardon my honesty - I am a Northerner
14 loach species bred, which will be next?