Titanomis

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Titanomis is a moth genus with a single species, Titanomis sisyrota, commonly called the frosted phoenix. It is an enigmatic, unplaced group in the moth family tree, and New Zealand classifies it as Data Deficient. The species is believed to be endemic to New Zealand. Only about ten specimens have ever been collected, and there were no confirmed sightings for 65 years until March 2024.

In March 2024, a Swedish tourist, Pav Johnsson, photographed a living Titanomis sisyrota on the balcony of the South Sea Hotel in Oban, Stewart Island. He later shared the photos on iNaturalist, where lepidopterist Robert Hoare identified the moth as T. sisyrota. Johnsson described himself as “a lucky idiot in the right spot at the right time.”

The genus and species were first described by Edward Meyrick in 1888 from a specimen collected by George Hudson. Historical records about where the holotype was collected were mixed for years, but later work accepted Nelson as the likely type locality. The holotype is stored at the Natural History Museum in London. The name Titanomis combines Titan (giant) with anomis (anomalous), reflecting the moth’s unusual position in classification. Sisyrota refers to hair-like features on the hindwings.

Meyrick’s original description notes a large female about 65 mm in wingspan, with dark forewings sprinkled with white and marked by distinctive black and white spots. The ash-grey forewings and pale fringe have led to thoughts about its habitat and camouflage on tree bark.

Very little is known about its biology. Adults are active from December to March and are attracted to light; some have even been found in homes and by floodlights. Its exact host plants are unknown, but researchers suspect associations with woody stems, rotten wood, or bracket fungi, and possibly beech forests or wetlands. Because of the rarity of records, T. sisyrota may be a sporadic visitor rather than a common resident; the last known collection before 2024 was in 1959 at Waipapa Dam in Waikato.

In 2001, New Zealand lepidopterist Robert Hoare called it “New Zealand’s most enigmatic moth” and proposed the common name “Frosted Phoenix,” alluding to its elusive nature and ash-coloured wings.