Tetraopes tetrophthalmus
In 3 days ~50% in a week ~80%
Tetraopes tetrophthalmus, the red milkweed beetle, is a beetle in the family Cerambycidae. The binomial genus and species names are both derived from the Ancient Greek for "four eyes." As in many longhorn beetles, the antennae are situated very near the eye–in the red milkweed beetle, this adaptation has been carried to an extreme: the antennal base actually bisects the eye.
The milkweed beetle, an herbivore, is given this name because it is host-specific to common milkweed (Asclepias syriaca). It has been reported on horsetail milkweed (Asclepias verticillata) in a disturbed site in Illinois.
Adults feed on the foliage and flowers of the plant, and the larvae feed on the roots. Therefore, much like the monarch butterfly, it is thought that the beetles derive some protection from predators by incorporating toxins from the plant into their bodies, thereby becoming distasteful. The red and black coloring are aposematic, advertising the beetles' inedibility.
These beetles feed by opening veins in the milkweed plant, decreasing the beetles' exposure to latex-like sap. When startled, the beetles make a shrill... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Shenandoah National Park | 🇺🇸 United States | |
| 2 | Great Smoky Mountains National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 2 | Detroit | 🇺🇸 United States | |
| 3 | Chicago | 🇺🇸 United States | |
| 4 | Boston | 🇺🇸 United States | |
| 5 | Toronto | 🇨🇦 Canada | |
| 6 | Montreal | 🇨🇦 Canada | |
| 7 | Philadelphia | 🇺🇸 United States | |
| 8 | Baltimore | 🇺🇸 United States | |
| 9 | New York City | 🇺🇸 United States | |
| 10 | Washington | 🇺🇸 United States |
Possible
About 20% of wildlife watchers report a Red Milkweed Beetle sighting in Detroit on a given day, based on 93 verified sightings from GBIF citizen-science data. It is the 11th most-seen of the 268 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 40% of wildlife watchers report a Red Milkweed Beetle in Detroit on a given day, against under 5% in September to April, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Red Milkweed Beetle sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 11 cities where we can rate Red Milkweed Beetle sightings, Detroit ranks 2nd at about 20%, level with the leaders once rounded. The best odds are in Minneapolis [Saint Paul] (United States, about 20%).
GBIF citizen-science records
It is estimated from how often the Red Milkweed Beetle is recorded against all the insects logged in Detroit (93 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.
