Mogrus ignarus

The species is medium-sized. The male has a high dark brown carapace that is between 2.6 and 2.8 mm (0.10 and 0.11 in) long and between 2.1 and 2.3 mm (0.083 and 0.091 in) wide. It has two stripes made of white hairs that stretch down the middle of the back. The eye field is black and has brown bristles around the eyes. The clypeus is brown and very low. The chelicerae are rather long and have a covering of white hairs. The labium is brown. The abdomen is between 2.6 and 3.0 mm (0.10 and 0.12 in) long and between 1.7 and 2.0 mm (0.067 and 0.079 in) wide. It is elongated and has a pattern on its back with the central third a brown stripe, the remainder white. The underside is dark, as are the spinnerets. The legs are brownish with long brown spines and hairs. The pedipalps are dark. The palpal bulb has a single upright pointed tibial apophysis and long thin embolus. The embolus has a membrane and long appendage at its base. This appendage helps distinguish the species from the otherwise similar Mogrus antoninus, which lives in Central Asia. It is also similar to Mogrus mathisi, with the wider palpal bulb and extension on the tegulum being the most obvious features that differentiate the other species as well as the lack of the embolus' membrane and appendage. The female has not been described.

Mogrus ignarus is endemic to Zimbabwe. The holotype was discovered in the Doddiebum Ranch alongside a larger paratype in 1985.