Evarcha idanrensis

Evarcha idanrensis has a body that is divided into two main parts: a cephalothorax and an abdomen. The female has a cephalothorax that is between 2.1 and 2.5 mm (0.08 and 0.10 in) long and 1.6 and 1.8 mm (0.06 and 0.07 in) wide. The carapace, the hard upper part of the cephalothorax, is moderately high. The top is brown covered with brownish hairs. It has a black eye field with longer bristles near the eyes themselves. Light hairs encircle the central eyes. The sides are darker with lighter hairs. The underside, or sternum, is yellow. The spider's face, or clypeus, is low and yellowish. The spider's mouthparts are typical for the genus, including its brown chelicerae and its labium, that is light brown with lighter tips.^[11]

The spider's abdomen is larger than the carapace, measuring between 2.2 and 3.5 mm (0.09 and 0.14 in) in length and 1.5 and 2.5 mm (0.06 and 0.10 in) in width. The top is brownish-grey with an indistinct pattern of dark patches and chevrons typical of the genus, covered with long thin translucent hairs. The underside is grey marked with four rows of light dots. The spider's spinnerets are yellowish-grey. It has generally light brown legs with occasional darker patches. They have brown hairs and long spines. The spider's copulatory organs are similar to others in the genus, particularly internally, except it has a smaller epigyne. It has a central depression with copulatory openings that lead to slightly sclerotized insemination ducts and complex many-chambered spermathecae.^[11] The male has not been described.^[1]

Evarcha spiders live across the world, although those found in North America may be accidental migrants.^[12] Although the genus is found across Africa, Evarcha idanrensis is endemic to Nigeria.^[1] The holotype was collected on Idanre Hill in Ondo State at an altitude of 700 m (2,300 ft) above sea level in 1974. Other examples have been found in other areas of Nigeria, including Kwara State near the town of Mokwa. The spider lives in savanna, particularly amongst sedges of the genus Trilepis.^[11]