Cataclysta lemnata
In 3 days ~10% in a week ~20%
Cataclysta lemnata, the small china-mark, is a moth species of the family Crambidae. It is found in Europe (including Great Britain and Ireland), Morocco and Iran. Adults of the species are sexually dimorphic. The wingspan is 18–19 mm for males and 22–24 mm for females. The forewings are white. The costa, discal spot and a series of terminal spots are all fuscous. The hindwings are white with scattered pale fuscous scales. Meyrick describes it- The forewings in male are whitish, with a yellowish-fuscous discal dot, traces of lines, and a pale brownish terminal streak; in female pale brownish, ochreous-mixed, with a darker discal spot, lines very indistinct, whitish, darker-edged, a whitish siibterminal streak. Hindwings are white; a dark fuscous discal dot; lines outlined with fuscous, sometimes nearly obsolete, first preceded by a yellow or fuscous spot in disc; subterminal and terminal ochreous lines enclosing a black fascia marked with four bluish-silvery dots. The larva is dark green or blackish; dorsal line black; head pale brown. See also Parsons et al.
The moth flies from May to August depending on the location. Larvae are semiaquatic. C. lemnata larvae have been recorded feeding on duckweed species (including Lemna species and Spirodela polyrhiza), as well as water ferns of the genus Azolla. The species is known to pupate in cocoons or shelters built from plant material. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 2 | Wadden Sea National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Liverpool | 🇬🇧 United Kingdom | |
| 2 | London | 🇬🇧 United Kingdom | |
| 3 | Amsterdam | 🇳🇱 Netherlands | |
| 4 | Rotterdam [The Hague] | 🇳🇱 Netherlands | |
| 5 | Berlin | 🇩🇪 Germany | |
| 6 | Manchester | 🇬🇧 United Kingdom | |
| 7 | Minsk | 🇧🇾 Belarus | |
| 8 | Birmingham | 🇬🇧 United Kingdom | |
| 9 | Munich | 🇩🇪 Germany | |
| 10 | Warsaw | 🇵🇱 Poland |
Rare
Under 5% of wildlife watchers report a Small China-Mark sighting in Saint Petersburg on a given day, based on 12 verified sightings from GBIF citizen-science data. It is the 193rd most-seen of the 448 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.
August
In that month about 10% of wildlife watchers report a Small China-Mark in Saint Petersburg on a given day, against under 5% in September to July, the lowest months. That is one of Saint Petersburg's wettest months, with about 100 mm of rain against 40 mm in February.
Between 5 and 8 pm
Across all the parks we cover, that three-hour window holds the most Small China-Mark sightings with a recorded time, and about half of them come between 6 pm and 6 am: it is most active around dawn and dusk.
16th of 18
Of the 18 cities where we can rate Small China-Mark sightings, Saint Petersburg ranks 16th at under 5%. The best odds are in Liverpool (United Kingdom, about 10%), London (United Kingdom, about 10%) and Amsterdam (Netherlands, about 10%).
GBIF citizen-science records
It is estimated from how often the Small China-Mark is recorded against all the insects logged in Saint Petersburg (12 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.
