Rhomphaea triangularis Ariamnes triangulatus is a species of tangle web spider endemic to New Zealand.

[1] This species was described in 1887 by Arthur Urquhart from male and female specimens.

[1] This species is only known from Te Karaka, New Zealand.

[1] 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".

[2]