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I would guess Female as the tail is quite short

It looks female to me. Short,fat,wide tail and large plastral opening. Nice Yniphora! Can we see some carapce and head photos?
Marty

I would say a female but this Angonoka is young and I remember that for many years one of my radiated males looked like a female. Once again Joss thanks for sharing your amazing photos. Can you show us more pics of your Astrochelys yniphora ?

I can't help thinking that it's too young and the gular scules can grow, but the short tail can tell it's a female...

I will say it's a female looking at the plastron near the tail, it is wide and it's tail is short. Cause usually females plastron are flat and wider for an easier egg delivery process.