Pterinochilus murinus
It is hard to see with the light and small curve of the plastic but I am leaning female.

Are you planning to rehouse this T soon. This species is a mix of arboreal and terrestrial so they do better with both options. Your enclosures seems to be a straight arboreal set up.

I provide my P. Murinus’s with about 5 to 6 inches of substrate on the bottom and 4 to 5 inches of climbing space with an anchor in the middle the tapers to about an 1 to 2 inches from the top. The width is ranged from 10 x 10 to 13 x 15 depending on the size of the tarantula.

Some of benefits of this type of set up for this species are:

1. The T is much more comfortable.
2. Way less stress on the animal when you are in ‘their’ space.
3. Less chance for the T to bolt out because she will have the option to hide. (Doesn’t mean she will because she won’t ever like you in her space no matter what)
4. Way less chance of you getting a nasty and painful bite because you will also have room to change the water dish, remove debris, maintenance, or feeding.
5. Less chance of getting stuck in a molt for not having enough space.
6. T has the option to build her home as she would like for her comfort.
7. It is closer to what she would naturally do for herself in the wild.
8. You won’t have a bunch of people like me politely trying to tell you that she needs an enclosure that are better suited this species.
9. You could get a more clear picture of the ventral side for sexing.

Cons to this.
1. There are no cons to this set up for this species.

I am not saying my P. Murinus set up are perfect with their set up but are as best as I can. If someone were to come along and educate me further and provided an even better option for my T’s, I would take the life line for my T because it is our responsibility to provide the best care as possible for our animals in captivity. They depend on us to do the right things for them because they can not do it for themselves.
 
Unless I missed some interesting developments in the hobby, P murinus aren't arboreal, they're just highly adaptable burrowers that use webbing to compensate where they can't dig.

I'm leaning female on the sex.
 
@Arachnophoric Agree complete. I have 1 that stays low but the other two are usually out and crawling around on top of the enclosure. So I included the slight arboreal adjustment based on my 3. I have 4 slings and 3 stay borrowed and one is a climber.

Those suggestions are based only off my experience with the species and not meant as fact for all. The main thing for that post is it appears that the set up in the picture is for an arboreal completely and not a P. murinus.

If you have these, what is your dimensions for the enclosures?
 
@Drea I can agree that it's nice to have a couple extra inches of clearance from the substrate with these guys - makes it much less likely that you're gonna have a successful escape attempt.

I have 4 as well (collecting localities) - three slings and one ~3" juvenile. I have my three slings, all about an inch in dls, in 8oz deli cups. Two are burrowed but regularly web up to the lid, much to my annoyance. The third sling just arrived today and is still settling, but I foresee similar behavior. I do occasionally find the slings hanging out on the sides of the deli cups, but less so now that they're more established in their enclosures. Though they're doing fine in the 8oz deli cups, I think 16oz would work a bit better and give you more space to work.

My 3" juvie is currently housed in a 5"x5"×7.5" critter keeper. She's been strictly burrowing and it's not too common to see more than her legs.
 

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Epiandrous fusillae sexing (Not Molts)
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