Metaltella simoni
(Hacklemesh Weaver)

Likely though I don’t mark them female unless I’m sure. What happens is immature males look just like females in many species so I can’t be sure if it’s a female or an immature male unless there is something more telling in the image like an egg sac, or a ventral view that would show the epigynum (female reproductive organ) if it were a mature female. Mature males, and males that are one molt away from maturity have enlarged pedipalps, these are the appendages near the spiders mouth that look a bit like they’re wearing boxing gloves on mature male… Read more »

Right, they’re not mandibles (called chelicerae on spiders). The pedipalps (appendages near the spider’s mouth) are reproductive organs on male spiders, they act like syringes and are used to transfer sperm to the female. This is the part of the spider often used when IDing a male spider under a microscope because the details on them are different between species. Female spiders have them also but they are slender and she can use them to help hold things, like prey or an egg sac.