Sure-fire way to separate a small grandis from a Cyclemys is to look at the anal scutes (the last pair on the plastron. If the seam between the anal and femoral scutes is straight across or angles slightly forward (and thus the anal scutes are small) it is a Heosemys (grandis, spinosa or depressa, does not work for ALL Heosemys species). If the seam curves far forwards so that the anal scutes are large it pretty likely is a Cyclemys.
Hope this helps.
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