Theria primaria
In 3 days ~10% in a week ~20%
Theria primaria, the early moth, is a moth of the family Geometridae. It is found throughout Western Europe and the South Caucasus. The wingspan is 32–37 mm (1.3–1.5 in) and the forewings are 14–17 mm (0.55–0.67 in) long. The ground colour of the forewings is reddish brown. The male subterminal and antemedial lines are slightly wavy with the areas between these lines usually being a darker brown than the ground colour. The forewing apex is rounded and there is a small discal spot towards the costal edge. The hindwings are pale whitish brown with a tiny discal spot. Females have short wings (60% of the length of the abdomen."The male may be known at once by the large discal spot of the forewing and the 2 crenulate dark lines, white-edged on the reverse sides. The rudimentary wings of the female have the apex acute, the forewing bears 2 approximated dark lines, the intervening space often darkened into a band. — ab. ibicaria H.-Sch. is darker, with the lines obsolete."
The moth flies in January to February [1]. The larva feeds on hawthorn (Crataegus monogyna) and blackthorn (Prunus spinosa) Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | London | 🇬🇧 United Kingdom |
Rare
Under 5% of wildlife watchers report an Early Moth sighting in London on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 1219th most-seen of the 1504 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.
January and February
In those months about 10% of wildlife watchers report an Early Moth in London on a given day, against under 5% in March to December, the lowest months.
Only London, in our data
London is the only city on Wallace's Line with enough records to rate Early Moth sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Geometridae
The closest relatives of the Early Moth that you can see in London (family Geometridae, Geometer Moths) are Riband Wave (about 20%), Least Carpet (about 20%) and Double-Striped Pug (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Early Moth is recorded against all the insects logged in London (7 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.
