| Pachyballus mombasensis | |
|---|---|
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Class: | Arachnida |
| Order: | Araneae |
| Infraorder: | Araneomorphae |
| Family: | Salticidae |
| Subfamily: | Salticinae |
| Genus: | Pachyballus |
| Species: | P. mombasensis
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| Binomial name | |
| Pachyballus mombasensis Wesołowska, Azarkina & Wiśniewski, 2020
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Pachyballus mombasensis is a species of jumping spider in the genus Pachyballus that is endemic to Kenya. The species was first described in 2020 by Wanda Wesołowska, Galina Azarkina and Konrad Wiśniewski. It is a very small brown spider, with a body that consists of a cephalothorax that is between 1.1 and 1.3 mm (0.04 and 0.05 in) long and an abdomen that is typically 2.1 mm (0.08 in) long. The spider is dark brown, apart from its darker eye field and yellow legs, although the front pair of male's legs are also brown. Otherwise, the male and female look very similar to the related ' Pachyballus castaneus and Pachyballus flavipes. It is necessary to look at the spiders' copulatory organs to distinguish them from others in the genus, particularly the shorter length of the female's insemination ducts and the size of the palpal bulb.