Tetragnatha nigricans is a species of Tetragnathidae spider that is endemic to New Zealand.
Taxonomy This species was described in 1917 by Raymond Comte de Dalmas from a female specimen collected in Whanganui.
Description The female is recorded at 5mm in length.
Distribution This species is only known from Whanganui, 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" and "Data Poor: Trend".
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