Scotospilus plenus is a species of Hahniidae spider 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 Tuana plena by Ray Forster in 1970 from male and female specimens. In 1986, Tuana was recognized as a synonym of Scotospilus, so the species name was changed to Scotospilus plenus.Brignoli, P. M. (1986). Spiders from Melanesia III. A new Alistra (Araneae, Hahniidae) from the Solomon Islands. Bollettino del Museo Civico di Storia Naturale di Verona 11: 327-332 The holotype is stored in Te Papa Museum under registration number AS.000089.
Description The male is recorded at 1.72mm in length whereas the female is 2mm. The carapace is dark brown. The legs are yellow brown. The abdomen is purplish with faint markings dorsally.
Distribution This species is only known from Westland, 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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