Bean weevil
Amazing fact
When disturbed, bean weevils feign death and drop off the plant.
Rutgers Cooperative Extension
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An illustration based on the real animal.
A little discovery to share.
When disturbed, bean weevils feign death and drop off the plant.
THE REAL WORLD
The real Bean weevil
- Scientific name
- Acanthoscelides obtectus
- Japanese name
- インゲンマメゾウムシ
- Group
- Insects
- Class
- Insecta
- Order
- Coleoptera
- Family
- Chrysomelidae
- Genus
- Acanthoscelides
A seed beetle that eats beans such as kidney beans and cowpeas.
Its head and thorax are black, with fine, faintly yellow-green hairs.
It is found all over the world except around India, and it has been confirmed to have settled in Japan too.
How the Bean weevil lives
Females lay eggs on or around seeds or pods, or inside seeds. Larvae bore into seeds, feed there and become pupae. As adults, they leave through round exit holes cut in the seeds. Adults do not eat seeds; they seek seeds in which to lay eggs.
Rutgers Cooperative ExtensionBasic data
- Size
- Body length: 2–4.5 mm
Where the Bean weevil has been recorded
Records: GBIF.org (CC0 and CC BY 4.0 records, retrieved 2026-11-07). Map: Natural EarthSee the records on GBIF
Watch wild animals from a distance. Do not touch or feed them, and take care of the places where they live.
Names around the world
- 日本語
- インゲンマメゾウムシ
- 简体中文
- 大豆象
- 繁體中文
- 大豆象
- Español
- Gorgojo pardo del frijol
- Français
- Bruche du haricot
- Deutsch
- Speisebohnenkäfer
- Italiano
- Tonchio del fagiolo
- العربية
- خنفساء الفاصولياء الجافة
- Русский
- Зерновка фасолевая
- Türkçe
- Fasulye böceği
Names come from Wikidata and iNaturalist records. Where a language has no recorded name, we use the scientific name.
Sources and how we check
- 農研機構 食品研究部門 — 食品害虫サイト 図鑑：インゲンマメゾウムシChecked: 2026-11-04
- 札幌市 — マメゾウムシ類Checked: 2026-11-04
- Rutgers Cooperative Extension — Bean Weevil (Acanthoscelides obtectus)Checked: 2026-11-07
We check each fact against its source. The illustrations simplify how the real animal looks.
The classification (class, order, family, genus) follows Wikidata records, checked against GBIF. Classifications can change as research goes on.
The basic data are the values given in each source. They vary with how the animal is measured, whether it is male or female, and whether it lives in the wild or in captivity.
This page was translated from the original Japanese with the help of AI.
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