Coenagrion hastulatum
In 3 days ~10% in a week ~30%
Coenagrion hastulatum, the northern damselfly or spearhead bluet, is a damselfly in the family Coenagrionidae. The species is widespread and common in northern Eurasia but is restricted to elevated or bog-like sites towards the west and south. In Britain, it is confined to a few small lochans in Scotland.
Coenagrion hastulatum is 31–33 millimetres (1.2–1.3 in) long. The specific part of the scientific name, hastulatum, from the Latin hastula (small spear) is because of the distinctive markings on the second segment of the abdomen that resembles a spear. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 2 | Pyrénées National Park | 🇫🇷 France | |
| 3 | Cévennes National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Novosibirsk | 🇷🇺 Russia | |
| 2 | Helsinki | 🇫🇮 Finland | |
| 3 | Moscow | 🇷🇺 Russia | |
| 4 | Saint Petersburg | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Spearhead Bluet sighting in Helsinki on a given day, based on 14 verified sightings from GBIF citizen-science data. It is the 445th most-seen of the 838 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.
May and June
In those months about 10% of wildlife watchers report a Spearhead Bluet in Helsinki on a given day, against under 5% in July to April, the lowest months.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most Spearhead Bluet sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 4
Of the 4 cities where we can rate Spearhead Bluet sightings, Helsinki ranks 2nd at under 5%. The best odds are in Novosibirsk (Russia, about 10%).
Same genus: Coenagrion
The closest relatives of the Spearhead Bluet that you can see in Helsinki (genus Coenagrion, Northern Bluets) are Azure Damselfly (about 10%) and Variable Bluet (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Spearhead Bluet is recorded against all the insects logged in Helsinki (14 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.
