Mesudus frondosus 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 frondosa by Ray Forster in 1970 from a female 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 Otago Museum.
Description The female is recorded at 7.2mm in length. The cephalothorax and legs are coloured pale orange brown. The abdomen is creamy with dark brown patches.
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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