Plexippus baro

Plexippus baro has a general appearance that is typical of the species, with a body length of 5.9 mm (0.23 in).^[9] It is a medium-sized spider. The male has a cephalothorax that typically measures 2.7 mm (0.11 in) long and 2.1 mm (0.083 in) wide. The carapace is brown, is marked with three wide stripes made of white hairs and a dark narrow line along the edge. The eye field is darker and has a covering of grey hairs. The clypeus is also brown and has a distinctive pattern of two thin parallel lines of white scales. There are scales at the bottom of the chelicerae as well. The labium is brown. The abdomen is an elongated oval that is typically 3.6 mm (0.14 in) long and 1.7 mm (0.067 in) wide. It is russet-brown in colour with a long white stripe down the middle and light stripes on the edge. The underside is pale apart from three brown lines that stretch from the front to the back. The spinnerets have a yellow tint. The legs are brown with sparse white hairs. The pedipalps are also brown. The bottom part of the cymbium is covered in white hair.^[10] The embolus is long with a serrated bulge at the base. The tibia has an apophysis, or appendage, that is short and straight with a sharp tip.^[11] Only the male has been described.^[1]

The spider can be told from other species in the genus like Plexippus paykulli by its longer embolus and the stripy clypeus that makes a distinctive pattern on its face.^[10] It most closely resembles Plexippus auberti, but has a more bulbous, broader and longer embolus and narrower tibial apophysis.^[9]

Plexippus baro is endemic to Ethiopia.^[1] The holotype was found in Baro, in Illubabor Province near Gambela in 1985, which is recalled in the species name.^[10]