[3] This species is endemic to New Zealand and has only been found in the Percy Valley and on Secretary Island in Fiordland.

The host species of adult S. bimacula are unknown but are likely to be fern spores or pollen from Sedge grasses.

As at 2017 S. bimacula has been classified as having the "At Risk, Naturally Uncommon" conservation status under the New Zealand Threat Classification System.

[4] The host species of adult S. bimacula are unknown but are likely to be fern spores or pollen from Sedge grasses.

[3] S. bimacula has been classified as having the "At Risk, Naturally Uncommon" conservation status under the New Zealand Threat Classification System.