Arilus cristatus
In 3 days ~10% in a week ~30%
Arilus cristatus, also known as the North American wheel bug or simply wheel bug, is a species of large assassin bug in the family Reduviidae and the only species of wheel bug found in the United States. It is one of the largest terrestrial Hemiptera in North America, reaching up to 38 mm (1.5 in) in length in its adult stage. This species exhibits sexually dimorphic characteristics, in that males are somewhat smaller than the females. A characteristic structure is the wheel-shaped pronotal ridge along its thorax. They are predators, using their proboscis to inject and dissolve prey tissue. The North American wheel bug is most active in daylight, residing in leafy areas and hiding whenever possible. Known habitats of the North American wheel bug include sunflowers, goldenrod, cotton, trunks of locust trees, and various fruit and tree groves. Despite the prevalence of the North American wheel bug in many habitats, the information compiled concerning the species is haphazard and incomplete.
The adult is gray to brownish gray in color and black shortly after molting, but the nymphs (which do not yet have the wheel-shaped structure) have bright red or orange abdomens.... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Congaree National Park | 🇺🇸 United States | |
| 2 | Shenandoah National Park | 🇺🇸 United States | |
| 3 | Merritt Island National Wildlife Refuge | 🇺🇸 United States | |
| 4 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 5 | Cumbres de Monterrey National Park | 🇲🇽 Mexico | |
| 6 | Everglades National Park | 🇺🇸 United States | |
| 7 | Monteverde Cloud Forest Reserve | 🇨🇷 Costa Rica |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Houston | 🇺🇸 United States | |
| 2 | Austin | 🇺🇸 United States | |
| 3 | Dallas | 🇺🇸 United States | |
| 4 | San Antonio | 🇺🇸 United States | |
| 5 | Washington | 🇺🇸 United States | |
| 6 | Baltimore | 🇺🇸 United States | |
| 7 | Philadelphia | 🇺🇸 United States | |
| 8 | Orlando | 🇺🇸 United States | |
| 9 | Chicago | 🇺🇸 United States | |
| 10 | New York City | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a North American Wheel Bug sighting in Philadelphia on a given day, based on 26 verified sightings from GBIF citizen-science data. It is the 197th most-seen of the 632 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
June and September–December
In those months about 10% of wildlife watchers report a North American Wheel Bug in Philadelphia on a given day, against under 5% in January–May and July–August, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most North American Wheel Bug sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
7th of 10
Of the 10 cities where we can rate North American Wheel Bug sightings, Philadelphia ranks 7th at under 5%. The best odds are in Houston (United States, about 10%), Austin (United States, about 10%) and Dallas (United States, about 10%).
Same family: Reduviidae
The closest relatives of the North American Wheel Bug that you can see in Philadelphia (family Reduviidae, Assassin Bugs) are Masked Hunter (about 10%) and Pale Green Assassin Bug (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the North American Wheel Bug is recorded against all the insects logged in Philadelphia (26 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.
