Anisolabis maritima
In 3 days ~10% in a week ~20%
Anisolabis maritima, commonly known as the maritime earwig or the seaside earwig, is a species of earwig in the family Anisolabididae. Similar to the seashore earwig, this species can be found near the shore line, and is cosmopolitan. It can be found in almost all biogeographic realms. Scientists believe that these earwigs originally came from Asia. Since then, however, they have been introduced to North America, and have now spread around the world due to international commerce.
This earwig is approximately 2.5 to 3 cm (1.0–1.2 in) long, and is a grayish or blackish in color with light yellow legs. Unlike many other species of earwigs, it does not have any wings. Male maritime earwigs are known for their characteristically asymmetrical forceps, which they use for mating, for capturing prey, and for protecting themselves. These forceps have even been known to be strong enough to break human skin.
This species preys on many different small invertebrates, including fleas, crickets, ants, small beetles, sowbugs; it even exhibits cannibalistic tendencies. Because of their location on the beach, maritime earwigs are often found under seaweed and driftwood during the day. They prefer “dark, warm, humid places” to stay in.
In maritime earwigs in particular, evidence of filial cannibalism has been found. Filial cannibalism is the practice of a mother eating some of her offspring. Scientists believe that maritime earwigs practice this behavior in order to make their clutch maintain the size that best optimizes their investment. In this case, the mother will often eat the youngest child, which serves to shorten the total time she spends caring for the young. As she optimizes the childbearing process, the amount of energy she has to spend on her remaining children increases, as does their chance of survival. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Acadia National Park | 🇺🇸 United States | |
| 2 | Great Bear Rainforest | 🇨🇦 Canada |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | New York City | 🇺🇸 United States | |
| 2 | Seoul | 🇰🇷 South Korea | |
| 3 | Tokyo | 🇯🇵 Japan | |
| 4 | Baltimore | 🇺🇸 United States | |
| 5 | Vancouver | 🇨🇦 Canada | |
| 6 | Boston | 🇺🇸 United States | |
| 7 | Seattle | 🇺🇸 United States | |
| 8 | San Francisco | 🇺🇸 United States | |
| 9 | Los Angeles | 🇺🇸 United States | |
| 10 | Washington | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Maritime Earwig sighting in Tokyo on a given day, based on 22 verified sightings from GBIF citizen-science data. It is the 416th most-seen of the 1013 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 a Maritime Earwig in Tokyo on a given day, so our monthly data shows no clear season.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Maritime Earwig sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Among the best
Of the 10 cities where we can rate Maritime Earwig sightings, Tokyo ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in New York City (United States, under 5%) and Seoul (South Korea, under 5%).
GBIF citizen-science records
It is estimated from how often the Maritime Earwig is recorded against all the insects logged in Tokyo (22 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.
