The copulatory organs are also unique amongst spiders in the genus, particularly the very long thin embolus on the palpal bulb of the male.

Euophrys nana is a species of jumping spider that was first described by Wanda Wesołowska Galina Azarkina and Anthony Russell-Smith in 2014.

[2] It was one of over 500 species identified by the Polish arachnologist Wesołowska during her career, more than any other contemporary writer and second only to the French archnologist Eugène Simon.

[4] The species is named for a Latin word that reflects the small size of the spider's body.

[5] In Wayne Maddison's 2015 study of spider phylogenetic classification, the genus Euophrys was listed to the tribe Euophryini.

[12] Euophrys nana is a small light spider with a body divided into two main parts: a broader oval cephalothorax and longer abdomen.

The carapace, the hard upper part of the cephalothorax, is brown with a broad diffused yellow stripe that runs from the front to the back and a covering of white hairs.

[1] While it has the elongated oval palpal bulb typical for the genus, the embolus that emanates from its top is very unusual.

It is very thin and long, with a distinctive curve and an initial loop hidden inside a shallow indentation in the bulb.