This species is very similar in appearance to G. elaina but can be distinguished as a result of the black terminal dots on its forewings.

This species was first described by Edward Meyrick in 1924 using two specimens collected at Mount Ruapehu and at Wainuiomata in December and January by George Hudson and originally named Diptychophora parorma.

[3] George Hudson discussed and illustrated this species under that name in his 1928 book The butterflies and moths of New Zealand.

[6] The male lectotype specimen, collected Mount Ruapehu by Hudson, is held at the Natural History Museum, London.

Forewings with termen more oblique than in elaina; whitish, slightly sprinkled grey; base spotted with blackish-grey, then some blackish-grey irroration tinged with whitish-ochreous, followed by first line, which is irregular, black, angulated outwards in disc and inwards towards termen; an obscure curved rather broad median shade of grey suffusion mixed with whitish-ochreous, above its middle an irregular X-shaped black mark, lower angle resting oh a roundish white spot; second line double, fine, grey, curved, waved, indented on fold; a terminal fascia of grey suffusion, including apical dot preceded by a white crescentic mark, and six black semicircular terminal dots more or less edged whitish anteriorly: cilia whitish, a dark grey basal line and greyish subapical line.