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@Scoolman I agree with scoolman as a molt is ALWAYS 100% accurate. At least until we come into a world where Tarantulas become like people and we find "hermaphrodite" Tarantulas.....then sexing by molt is out the window....lol.
@Thistles oh let me tell you about those tiny things....lol....I've noticed pics posted on AB and a lot of people do mistake them for spermatheca. The thing with that is that a female won't just have spermatheca alone. She has a flap, too, even if it's a small one. That's what I would be looking for.