From this pic I'd say male, because of the darker spot above the epigastric furrow. I'm not sure, though. Try to get a close up of only the area in question.
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![Acanthoscurria geniculata [ventral sexing]](/data/xfmg/thumbnail/54/54871-41e1a707d8f344d50ad29445fa72c20a.jpg?1580406652)
