The female has very wide looping insemination ducts that lead to heavily sclerotized multi-chambered spermathecae.

Evarcha flagellaris is a species of jumping spider that was first described by Charles Haddad and Wanda Wesołowska in 2011.

[5] In Wayne Maddison's 2015 study of spider phylogenetic classification, the genus Evarcha was moved to the subtribe Plexippina.

[11] This designation is not widely accepted and the species remains in the Evarcha genus in the World Spider Catalog.

[1][12] The species is named for a Latin word for a whip and recalls the shape of the male embolus.

The front portion is covered with an orange scutum fringed with thick brown bristles at the rear.

The palpal bulb is rounded with a bulge sticking out of the middle and a very long whip-like embolus with a slightly kinked end.

There are two beige stripes down the centre, lines of dark patches on the sides, and a few brown bristles scattered on the top.

The copulatory openings lead to slightly-sclerotized and very wide insemination ducts that form a small series of loops on their way to the heavily sclerotized spermathecae or receptacles.

[16] The species is similar to the related Evarcha striolata, differing in the presence of the scutum on the male abdomen and the shape of the carapace.

[13] The male differs from the otherwise similar Evarcha karas in its narrow and pointed tibial apophysis and the way that it does not touch the embolus.

[17] Evarcha spiders live across the world, although those found in North America may be accidental migrants.

[1] The male holotype for the species was found in the Erfenis Dam Nature Reserve in Free State in 2009.

[16] The first example to be found in Kenya was discovered on the east slope of Mount Elgon in 1948 at an altitude of 2,050 m (6,730 ft) above sea level.