It is externally similar to Menemerus pulcher and can only be reliably distinguished by comparing the internal structure of the copulatory organs.

Menemerus plenus is distinctive for its lack of accessory glands and the thick wall of its insemination ducts.

Menemerus plenus is a species of jumping spider that was first described by Wanda Wesołowska and Anthonius van Harten in 1994.

[1] It was one of over 500 species identified by the Polish arachnologist Wesolowska during her career, making her one of the most prolific in the field.

[4] Genetic analysis has shown that the genus Menemerus is related to the genera Helvetia and Phintella.

[9] The vast majority of the species in Menemerines are members of the genus, with additional examples from Kima and Leptorchestes.

It is greyish-russet and covered in brownish hairs with a pattern of yellowish-white patches making a herring-bone shape in the middle and irregular spots on the sides.

The spider has light brown legs that are covered in dark hairs and spines.

[17] Menemerus spiders are found throughout Africa and Asia, and have been identified as far as Latin America.