Batrachedra filicicola

Batrachedra filicicola, also known as the ring fern spore-eater, is a species of moth of the family Batrachedridae. It is endemic to New Zealand and has been collected in the North Island. The larvae of this species feed on the spores of the silver fern. Adults are on the wing in November and December. This species is attracted to light and has also been collected in the day by sweeping silver fern fonds.

Taxonomy
This species was first described by Edward Meyrick in 1917 using material collected by George Hudson at Karori on tree-ferns in November. George Hudson discussed and illustrated this species in his 1928 book The Butterflies and Moths of New Zealand. The lectotype specimen is held at the Natural History Museum, London.

Description
The mature larva of this species is small and white coloured and grows up to 5 mm long.

Meyrick described the male adult of this species as follows: "♂︎. 8 mm. Head and thorax bronzy-whitish. Palpi with appressed scales, whitish, with faint greyish marks at apex of second joint, and base and apex of terminal joint. Abdomen grey. Forewings narrow-lanceolate, apex narrowly produced ; violet-grey, becoming darker posteriorly, produced apex blackish : cilia grey, base round apical third of wing paler and sprinkled with blackish, sometimes forming indistinct dots, at apex with a short black subbasal bar. Hindwings violet-grey ; cilia grey."

Distribution
B. filicicola is endemic to New Zealand. It has been collected in Wellington and in the Hawkes Bay.

Biology and behaviour
This species is on the wing in November and December. This species is attracted to light. It has been collected in sunshine by sweeping the fonds of its host the silver fern. It is a fast runner and makes short, rapid flights. Adults have been collected by sweeping its larval hosts.

Host species
The larva of this moth feed on the spores of Cyathea dealbata and on Paesia scabrula.