Mouse spiders are black generally and have much larger mandibles and thick legs:
- Mouse spiders have high, bulbous heads and jaws
- The carapace is smooth and shiny
- The eyes are spread across the front of the carapace, not closely grouped
- The spinnerets are short, the last segment domed and button-like
- Male spiders have long slender pedipalps
- Male spiders have no mating spurs on the legs
- Males of some species have distinctive colour markings but others are black overall