Plexippus baro

Plexippus baro is a species of jumping spider in the genus Plexippus that lives in the Ethiopia. The male was first described by Wanda Wesołowska and Beata Tomasiewicz in 2008. The female has not been identified. The spider is medium-sized with a cephalothorax that is typically 2.7 mm long and an abdomen 3.6 mm long. The carapace is brown with three white stripes and the abdomen is russet-brown with a single white stripe. The spider has a pattern of two narrow white stripes on its clypeus which give it a distinctive face. The copulatory organs distinguish it from related species, particularly the male's longer embolus.

Taxonomy
Plexippus baro is a jumping spider that was first described in 2010 by Wanda Wesołowska and Beata Tomasiewicz. It is one of over 500 species identified by the Polish arachnologist Wesołowska. It was placed in the genus Plexippus, first raised by Carl Ludwig Koch in 1846. The word plexippus is Greek and can be translated striking or driving horses. It was the name of a number of heroes in Homer's Iliad. The genus was placed in the subtribe Plexippina in the tribe Plexippini, both named after the genus, by Wayne Maddison in 2015, who listed the tribe in the clade Saltafresia. It was allocated to the subclade Simonida, named in honour of the French arachnologist Eugène Simon. In 2016, it was combined with 31 other genera into the group Christillines, named after the genus Chrysilla. In his 2017 study of the genus, Jerzy Prószyński placed Plexippus baro within the 20 species in the genus that were recognisable as unique.

Description
Plexippus baro has a general appearance that is typical of the species with a body length of 5.9 mm. It is a medium-sized spider. The male has a cephalothorax that measures typically 2.7 mm iong and 2.1 mm 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 long and 1.7 mm 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 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. 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. Only the male has been described.

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. It most closely resembles Plexippus auberti, but has a more bulbous, broader and longer embolus and narrower tibial apophysis.

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