I did a quick web search for Brotia.  I did not find the species dactylus,
though I found a lot of other species.  I also found that no-one can seem to
agree where to classify this genus.  On various websites I found it listed
under Thiaridae, Pleuroceridae, Melanellidae, and Melanatriidae (which I
never heard of).  Which is the correct family?

I also discovered that there is a genus of tropical fish called Brotia.
What's the story here?  I thought that was a no-no.  The fish can be seen
here:

http://members.tripodasia.com.sg/Shellsnut/loachinternal.htm

Regards,
Paul M.