"Bald patch" on araneomorph ?

vounti

Arachnoknight
Joined
Apr 29, 2020
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211
Hello everyone ! :)

I've had that Sicarius thomisoides specimen for 2-3 years now and Ive noticed that when it gets very plump, it shows this "bald patch" on the abdomen

That spot is usually full black when the spider isn't very fed

since they don't have urticating hair, I have no idea what it could be. Does someonehave a clue ?
 

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