3.5" Theraphosa stirmi [molt sexing]
My T stirmi molted it's now around 3.5-4" there's no triangle between the book lungs but not sure if it would show up at this size? Here's a pic of the inside.
male, this species have visible flap at small sizes. At 3'' there should be an obvious flap for a female.
 
Guess it gives me an excuse to get him a lady friend when he's older, thanks for the reply.
 

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Spermathecae sexing (Molts)
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JordG
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