Silhouette: Udo Schmidt · PhyloPic
Amphimallon majale
In 3 days ~10% in a week ~30%
The European chafer (Amphimallon majale; formerly classified as Rhizotrogus majalis) is a beetle of the family Scarabaeidae. Formerly found only in continental Europe, this invasive species is now found at temperate latitudes in North America. The large, white grubs of A. majale feed on the roots of most cool-latitude grasses, both wild and cultivated. This has made the European chafer an enemy of lawns.
Adult beetles are medium-sized, light reddish-brown, and approximately 13–14 millimetres (1⁄2–9⁄16 in) long. Their pronotum features a narrow band of light-yellow setae and the underside of the thorax has similar coloured setae. The tip of the abdomen protrudes beyond the wing covers. Wing covers have longitudinal grooves.
Larvae are white-coloured and C-shaped, with a yellow-brown head and six jointed legs. The raster has two distinct rows of small spines that diverge outward at the tip of the abdomen. Fully grown larvae are 20–23 millimetres (25⁄32–29⁄32 in) long.
The pupae of the European chafer resemble those of the other turf-infesting scarab beetles, such as the Japanese beetle. Pupae are about 16 millimetres (5... Wikipedia →
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a European Chafer sighting in Minneapolis [Saint Paul] on a given day, based on 34 verified sightings from GBIF citizen-science data. It is the 205th most-seen of the 672 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 July
In those months about 10% of wildlife watchers report a European Chafer in Minneapolis [Saint Paul] on a given day, against under 5% in August to May, the lowest months. Those are among Minneapolis [Saint Paul]'s wettest months, with about 110 mm of rain a month against 20 mm in January.
3rd of 9
Of the 9 cities where we can rate European Chafer sightings, Minneapolis [Saint Paul] ranks 3rd at under 5%. The best odds are in Vancouver (Canada, about 10%) and Seattle (United States, about 10%).
Same family: Scarabaeidae
The closest relatives of the European Chafer that you can see in Minneapolis [Saint Paul] (family Scarabaeidae, Scarabs) are Japanese Beetle (about 20%), Grapevine Beetle (about 10%) and Bumble Flower Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the European Chafer is recorded against all the insects logged in Minneapolis [Saint Paul] (34 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.
