Mogrus cognatus

The species is small. The male has a high cephalothorax that is between 2.6 and 2.8 mm (0.10 and 0.11 in) long and 1.9 and 2.2 mm (0.075 and 0.087 in) wide. It has a dark brown carapace, or upper hard shell of the cephalothorax, that has dense white hairs on the side and two white streaks on the back or fawn-brownish carapace with a brown stripe across the middle at the back. The eye field is black, with long brown bristles near the eyes. The sternum, or underside of the cephalothorax, is yellow. The clypeus is covered with dense long white hairs. The chelicerae are very dark, nearly black. The abdomen is thin and has a pointed end. It is dark brown with two streaks formed of white hairs on its back and a dark yellow underside with a brown stripe down the middle or yellow-white with brown dots on its back, a brown band on the sides and a dark stripe on the underside. It is between 2.7 and 3.1 mm (0.11 and 0.12 in) long and 1.8 and 1.9 mm (0.071 and 0.075 in) wide. The spinnerets are light brown. The legs are dark yellow with brown hairs and spines. It has dark pedipalps. The palpal bulb is typical for the genus.It has a narrow cymbium and long tibial apophysis, or appendage, with very thin tip. It has a very long and thin embolus that entwines the palpal bulb and has a broad membrane at its base. The female has not been described. The spider is similar to others in the genus. …

Mogrus cognatus lives in the United Arab Emirates and Yemen. The holotype was discovered near Zabid in Yemen in 1993. Examples have been found in the Al Mahwit Governorate. It was first identified in the United Arab Emirates in Khor al-Khwair in 2007.