I say throw a female in and see what happens My guess is male but not 100%. Maybe try looking at the belly, I know I can see the eggs and plump belly in my adult female. I also have a female with bristles on the edge of her lip but they aren’t that long.
I have never seen a female with bristles that long. And the small bristles that females occasionally do get.. certainly don't fork off like I see at least one bristle doing there in the middle. That one bristle is also a tad bit higher than the ones along the lip.
Any chance you can get a shot on a light background of it? I am honestly leaning towards make based on body shape and the "heart" on the back of the head.
While females do get bristles (and sometimes long ones), I've not seen one with branched bristles. And some males don't have the genes to get monster tentacle face.