Hetaerina americana
In 3 days ~10% in a week ~20%
The American rubyspot (Hetaerina americana) is a damselfly of the family Calopterygidae. Males have a lustrous red head and thorax and a large red spot at the base of each wing. The abdomen of both genders is brilliant green.
The female may have either green or copper colored marks on the thorax and possess faint amber wing spots with patterned bodies that vary from brown to green. The species has served as a widely used model system in studies of sexual selection, territorial behavior, and population genetics.
The name highlights this damselfly's status as the most widespread of the North American rubyspots. Hetaerina americana was first formally described by Fabricius in 1798. It is one of 37 sexually dichromatic species in the genus Hetaerina. Most rubyspots are concentrated in the neotropical region, with the greatest number of species found in South America. Members of the genus Hetaerina are difficult to identify because they closely resemble each other in body size, coloration, and habitat use. The most reliable way to distinguish species is through the shape of male caudal appendages, the structures at the tip of the abdomen used to grasp females... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Saguaro National Park | 🇺🇸 United States | |
| 2 | Shenandoah National Park | 🇺🇸 United States | |
| 3 | Cumbres de Monterrey National Park | 🇲🇽 Mexico | |
| 4 | Great Smoky Mountains National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Austin | 🇺🇸 United States | |
| 2 | Denver | 🇺🇸 United States | |
| 3 | Dallas | 🇺🇸 United States | |
| 4 | Monterrey | 🇲🇽 México | |
| 5 | Sacramento | 🇺🇸 United States | |
| 6 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 7 | San Antonio | 🇺🇸 United States | |
| 8 | Toronto | 🇨🇦 Canada | |
| 9 | Houston | 🇺🇸 United States | |
| 10 | San Francisco | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report an American Rubyspot sighting in San Francisco on a given day, based on 34 verified sightings from GBIF citizen-science data. It is the 305th most-seen of the 737 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 an American Rubyspot in San Francisco on a given day, so our monthly data shows no clear season.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most American Rubyspot sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
10th of 12
Of the 12 cities where we can rate American Rubyspot sightings, San Francisco ranks 10th at under 5%. The best odds are in Austin (United States, about 10%), Denver (United States, about 10%) and Dallas (United States, about 10%).
Same order: Odonata
The closest relatives of the American Rubyspot that you can see in San Francisco (order Odonata, Dragonflies and Damselflies) are Vivid Dancer (about 10%), Flame Skimmer (about 10%) and Variegated Meadowhawk (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the American Rubyspot is recorded against all the insects logged in San Francisco (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.
