Drymaplaneta semivitta
In 3 days ~10% in a week ~20%
Drymaplaneta semivitta is a species of cockroach native to Australia and introduced to New Zealand. In New Zealand, it is known as the Gisborne cockroach, after the city of Gisborne where it was first discovered in the country. It has also been claimed to have first appeared in Tauranga in 1954, probably arriving on a log shipment.
One of the larger cockroaches, Drymaplaneta semivitta is about 20–45mm long and 12–15mm wide. It is a glossy dark brown, with distinctive tan or white coloured translucent stripes along each side of its head. Unlike many cockroaches, it has no vestigial wings.
In males, the third and fourth maxillary palps are enlarged, and the hind tibiae are flattened and expanded. Drymaplaneta semivitta is often found in wood material, such as timber or bark chips. It feeds off organic material but does not normally infest food. In cold weather, it can be found in roof cavities and the empty spaces between walls. D. semivitta is generally regarded as harmless.
Hex-2-enal is present in the defensive secretions of D. semivitta. This chemical also occurs in some other species of Drymaplaneta. Drymaplaneta... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Abel Tasman National Park | 🇳🇿 New Zealand |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Gisborne Cockroach sighting in Sydney on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 621st most-seen of the 742 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Gisborne Cockroach in Sydney on a given day, so our monthly data shows no clear season.
Between 6 and 9 pm
Across all the parks we cover, that three-hour window holds the most Gisborne Cockroach sightings with a recorded time, and nearly all of them come between 6 pm and 6 am: it is mostly seen at night.
4th of 4
Of the 4 cities where we can rate Gisborne Cockroach sightings, Sydney ranks 4th at under 5%. The best odds are in Auckland (New Zealand, about 10%), Perth (Australia, about 10%) and Melbourne (Australia, about 10%).
GBIF citizen-science records
It is estimated from how often the Gisborne Cockroach is recorded against all the insects logged in Sydney (6 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
