I feel like that is a female. I have a few male ts (old world and new world) any they have large protruding extra set of spinners. They are way more obvious than what are on your metallica.
Sexing is also way more complicated than people think. Best way to know is the obvious molt check or just wait until it's mature.
I'm betting on female though. Keep us updated!
(I have two metallicas and they look different underneath, so could be male and female but who knows lol)
There's that darker patch between the upper booklungs, along the center of the furrow, which appear to be epiandrous fusillae. They're a cluster of micro-spinnerets that aide a male in creation of sperm webs after he matures. That, combined with the epigastric furrow not being very open or "lippy" in appearance leads me to believe your T is a male.
It isn't the same species so it's not an apples-to-apples comparison, but here's the ventral on female P. rufilata just a smidge smaller than your P. metallica. Note that the furrow is very lippy and it lacks any noticable off-colored patch where there's one present on yours.
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