Zearchaea fiordensis is a species of Mecysmaucheniidae spider that is endemic to New Zealand.

[1] This species was described in 1955 by Ray Forster from male and female specimens collected in the South Island.

[1] This species is only known from scattered localities in the South Island of New Zealand.

[1] Under the New Zealand Threat Classification System, this species is listed as "Not Threatened".

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