Many turtle species that look more or less similar may interbreed. Even species that are genetically quite far apart (there are many examples, such as the seemingly extreme red-eared slider x Reeves', or Cuora flavomarginata x Geoemyda japonica). So no, I would not risk keeping your male with the female yellow muds. Saying that, I am keeping a three-striped pair together with a loggerhead musk, and he is not the least interested. All of these 2 females' many offspring were 'pure'. When I introduced my red-cheek male to a mixed-species female tank, however, I had to intervene and force him off a three-striped female just before he penetrated...just in time!

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