Acanthoscurria geniculata
@MrGhostMantis -- what are you seeing in this photo that looks like spermatheca or the uterus externus? I'm not seeing it, especially after comparing to reference photos for the species.

@andy1997 -- I would confirm with subsequent moults as the spider grows.
 
@andy1997 Here is how my male looked at 3".


the same male at 4"


If he is male, you may also already be able to see the dark patch that develops above the epigastric furrow.

the same male at 3.5"


the same male at 4"
 

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Category
Spermathecae sexing (Molts)
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andy1997
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Device
samsung SM-G970U
Aperture
ƒ/2.4
Focal length
4.3 mm
Exposure time
1/181
ISO
50
Filename
20200112_202203.jpg
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1.5 MB
Date taken
Sun, 12 January 2020 8:22 PM
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3024px x 4032px

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