Bug FAQAcorn Anobiid
Ozognathus cornutus · Order: Coleoptera · Family: Anobiidae
Adult Acorn Anobiid beetles are dark brown or black and measure about 1.5 to 2.8 mm long. They live in dead wood, including galls, and also eat dried fruits and vegetables.
Source: Wikipedia
How to recognize it
Adults are dark brown or black in color.
Source: Wikipedia
Size
They are 1.5 to 2.8 mm long.
Source: Wikipedia
What it eats
They are saproxylophagous, feeding on dead wood and associated material. They also consume dried fruits and vegetables.
Source: Wikipedia
Life cycle
Females lay their eggs inside galls made by other insects.
Source: Wikipedia
Where it comes from
They are native to North America.
Source: Wikipedia
Where it is found in the US
Recorded in 2 of 51 states and DC. Most records: California, Hawaii.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Months it is reported in the US
Source: GBIF
More photos
Questions people ask
Where do they lay their eggs?
Females lay eggs inside galls created by other insects.
Source: Wikipedia
Same family (Anobiidae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Ozognathus_cornutus
Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia
Text written 2026-10-27 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-27.