A. avicularia
I'm new at this, but I think those are definitely spermathecae... can anyone confirm?
What size? It looks more like the torn corners of the upper booklungs to me than spermathecae, the angle it's sitting st makes it a little difficult to tell.
 
@jilly Their spermathecae, and uterus externus, would be far more obvious at that size. This is what they look like at 2"...
 

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Spermathecae sexing (Molts)
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