Cybister fimbriolatus
In 3 days ~30% in a week ~60%
Cybister fimbriolatus, the giant diving beetle, is a species of predaceous diving beetle in the family Dytiscidae. It is found in North America and the Neotropics. These beetles are active in summer and live in ponds or ditches, feeding on other aquatic arthropods. They are nocturnal but sometimes active during the day. For mating, the males have expanded front feet to help them grab hold of a female. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Padre Island National Seashore | 🇺🇸 United States | |
| 2 | Big Cypress National Preserve | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Dallas | 🇺🇸 United States | |
| 2 | Houston | 🇺🇸 United States | |
| 3 | Orlando | 🇺🇸 United States | |
| 4 | San Antonio | 🇺🇸 United States | |
| 5 | New York City | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Fringed Diving Beetle sighting in Padre Island National Seashore on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 29th most-seen of the 74 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
January and June
In those months about 20% of wildlife watchers report a Fringed Diving Beetle in Padre Island National Seashore on a given day, against under 5% in February–April, August–September and December, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Fringed Diving Beetle sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Yes
Of the 2 parks where we can rate Fringed Diving Beetle sightings, Padre Island National Seashore has the highest daily chance: about 10%. Next come Big Cypress National Preserve (United States, about 10%).
Same order: Coleoptera
The closest relatives of the Fringed Diving Beetle that you can see in Padre Island National Seashore (order Coleoptera, Beetles) are Phanaeus difformis (about 10%), Coastal Tiger Beetle (about 10%) and Spotted Cucumber Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Fringed Diving Beetle is recorded against all the insects logged in Padre Island National Seashore (11 verified sightings from 2019 to 2026), 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.
