Prasonica plagiata is a species of Araneidae that is endemic to New Zealand.
This species was described as Lobetina plagiata in 1917 by Raymond Comte de Dalmas. The genus Lobetina was recognised as a synonym of Prasonica in 1971, so the species is now known by the name Prasonica plagiata.
The body is recorded at in length.
This species is endemic to New Zealand.
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".