Pyrgotis siderantha is a species of moth belonging to the family Tortricidae, commonly known as leafroller moths. It is endemic to New Zealand.
Taxonomy and Etymology
The species was first formally described by the English entomologist Edward Meyrick in 1907. The specific epithet "siderantha" is derived from Greek roots, though its precise intended meaning in relation to the moth's characteristics would be found in Meyrick's original description.
Description
Adult Pyrgotis siderantha moths have a wingspan typically ranging from 13 to 17 mm. The forewings are generally pale ochreous or brownish-ochreous, and may exhibit darker, often indistinct, markings such as an oblique fascia (a band or stripe across the wing) or scattered dark scales. The hindwings are usually a plain greyish colour. Like many members of the Tortricidae family, when at rest, the moth often holds its wings in a characteristic roof-like posture over its body.
Distribution and Habitat
This moth species is found exclusively within New Zealand. Its habitat includes native forests and scrubland where its larval host plants are present. It has been recorded from various locations across both the North and South Islands.
Life Cycle and Host Plants
The larvae of Pyrgotis siderantha are polyphagous, meaning they feed on a variety of different plant species. They are known to feed on several native New Zealand trees and shrubs, including:
- Griselinia littoralis (Broadleaf or Kapuka)
- Nothofagus menziesii (Silver Beech)
- Nothofagus solandri (Black Beech or Mountain Beech)
- Plagianthus regius (Lowland Ribbonwood or Manatu)
As a leafroller, the larvae typically feed within rolled leaves or other plant structures, providing them with protection from predators. Detailed studies on the full life cycle stages, such as specific larval instars or pupation behaviour, are less widely documented for public access.