EDIT: Turns out this is probably Anu una instead, a related species, endemic to the South Island going by the iNaturalist records. A monotypic genus.

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A very large and diverse genus of hoverflies found throughout the world except the Palearctic. The adults are usually brightly coloured pollinators. Larvae are usually predators of aphids and relatted insects, although some are leaf-miners, stem-borers or pollen-feeders.

The genus and its relatives are currently being studied using both molecular and morphological methods, and it's already clear that the entire genus and its relatives will need a thorough overhaul.