This is a smaller form of auratus, and one of several mostly black forms of auratus. Many of these darker forms are very shy, but these guys are not that bad, probably better than blue auratus, but not as bold as green and bronze auratus. One interesting thing about these frogs is that the females have short bars in their pattern, along with the spots, but the males are only spotted. I am not familiar with another instance of sexual dimorphism in dart frogs.
Juveniles show a more typical auratus pattern, which gradually changes to the adult markings, so sexing will still not be possible until they approach maturity in most cases.
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