This species was first described in 1939 by Louis Beethoven Prout using material collected at Ben Lomond near Queenstown (male holotype) and at The Obelisk in the Old Man Range / Kopuwai in Otago (female allotype) by George Howes.

Markings broader, yellower; forewing with median line definitely and the postmedian rather acutely angled, subterminal extremely slight except anteriorly and as a dot in cellule 3; hindwing with similar distinctions.

[2] The female moth lays her eggs within the flower buds of their host plant.

[7] When the larvae emerge from their eggs, they eat into the leaves or buds of their host, hiding from predators.

[7] The host plants for the larvae of N. isomoera are endemic species within the genera Pimelea and Kelleria.