Mesudus setosus is a species of Desidae spider that is endemic to New Zealand.Forster, R. R. (1970). The spiders of New Zealand. Part III. Otago Museum Bulletin 3: 1-184.
Taxonomy This species was described as Manawa setosa by Ray Forster in 1970 from a male specimen. It was moved to the Mesudus genus in 2007.Özdikmen, H. (2007). Nomenclatural changes for seven preoccupied spider genera (Arachnida: Araneae). Munis Entomology and Zoology 2: 137-142. The holotype is stored in Te Papa Museum.
Description The male is recorded at 6.46mm in length. This species is uniform yellow brown and lacks markings.
Distribution This species is only known from Fiordland, New Zealand.
Conservation status Under the New Zealand Threat Classification System, this species is listed as "Data Deficient" with the qualifiers of "Data Poor: Size", "Data Poor: Trend" and "One Location".
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