Silhouette: Gregor Bucher, Max Farnworth · PhyloPic
Gnatocerus cornutus
In 3 days ~10% in a week ~30%
Gnatocerus cornutus, or the broadhorned flour beetle, is a common species of beetle in the Tenebrionidae family. It is distributed worldwide and is commonly found in warm, tropical regions, preferring grains, yeasts, and flours as its main diet. The total development time is about 47 days. G. cornutus is predominately found in mills as a storage pest and has a wide distribution.
The beetle undergoes four developmental stages, with diet quality and larval density influencing development rates and body size. Nutrition plays a crucial role, with higher-calorie diets leading to enhanced survival and faster development. Genetics also impact traits like mandible length, regulated by specific peptides and transcription factors.
Male-male competition for mates is fierce, with larger weapons indicating better fighting ability and increased reproductive success. Female mate choice varies based on competitive or non-competitive mating situations. Environmental factors like nutritional availability influence offspring sex ratios and reproductive strategies like polyandry. Oviposition patterns and larval development are also affected by environmental conditions, with larval size determining pupation success.
The biology, behavior, and reproductive strategies of G. cornutus are finely tuned to its ecological niche and environmental pressures. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Broadhorned Flour Beetle sighting in Great Smoky Mountains National Park on a given day, based on 13 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 379th most-seen of the 822 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–July and September
In those months about 10% of wildlife watchers report a Broadhorned Flour Beetle in Great Smoky Mountains National Park on a given day, against under 5% in August and October–April, the lowest months.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most Broadhorned Flour Beetle sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Great Smoky Mountains National Park, in our data
Great Smoky Mountains National Park is the only park on Wallace's Line with enough records to rate Broadhorned Flour Beetle sightings: about 10% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Broadhorned Flour Beetle is recorded against all the insects logged in Great Smoky Mountains National Park (13 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.
