Neostylopyga rhombifolia
In 3 days ~50% in a week ~80%
Neostylopyga rhombifolia, the harlequin roach, is a species of flightless cockroach in the family Blattidae. It is a synanthropic species, often found in houses, and it is usually considered a pest. It has been introduced globally to tropical and subtropical regions as a result of trade. Its original native range is unknown, but is believed to be somewhere in tropical Asia.
Harlequin roach adults are around 20 to 27 mm (0.79 to 1.06 in) long. Both males and females are flightless. They lack hindwings, and the forewings (tegminia) are reduced to two small lobes. Both also have distinctive black and yellow patterns. Females are typically larger and stouter than males. Harlequin roaches are popular as pets due to their striking coloration.
Harlequin roaches produce a strong-smelling chemical defense, amyl acetate, that has been compared to almond, cherry, pear, or banana extracts. The mitochondrial genome of the harlequin roach was sequenced in 2016. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Ankarafantsika National Park | 🇲🇬 Madagascar | |
| 2 | Cabo Pulmo National Park | 🇲🇽 Mexico |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Davao City | 🇵🇭 Philippines | |
| 2 | Yogyakarta | 🇮🇩 Indonesia | |
| 3 | Manila | 🇵🇭 Philippines | |
| 4 | Colombo [Sri Jayawardenepura Kotte] | 🇱🇰 Sri Lanka | |
| 5 | Jakarta | 🇮🇩 Indonesia | |
| 6 | New Delhi | 🇮🇳 India | |
| 7 | Kaohsiung | 🇹🇼 Taiwan | |
| 8 | Monterrey | 🇲🇽 México | |
| 9 | Guadalajara | 🇲🇽 México |
No species of the same family or order lives in Cabo Pulmo National Park, so these are its closest relatives here: other insects.
Possible
About 20% of wildlife watchers report a Harlequin Cockroach sighting in Cabo Pulmo National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 18th most-seen of the 22 insects we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
June
In that month about 50% of wildlife watchers report a Harlequin Cockroach in Cabo Pulmo National Park on a given day, against under 5% in February, May and July–December, the lowest months. That is one of Cabo Pulmo National Park's driest months, with about 15 mm of rain against 120 mm in September.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Harlequin Cockroach sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
2nd of 2
Of the 2 parks where we can rate Harlequin Cockroach sightings, Cabo Pulmo National Park ranks 2nd at about 20%. The best odds are in Ankarafantsika National Park (Madagascar, about 30%).
GBIF citizen-science records
It is estimated from how often the Harlequin Cockroach is recorded against all the insects logged in Cabo Pulmo National Park (5 verified sightings from 2019 to 2026), 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.
