Fruitworm Beetles

Byturidae

Classification

Phylum: Arthropoda
Subphylum: Hexapoda
Class: Insecta
Order: Coleoptera
Suborder: Polyphaga
Superfamily: Cleroidea
Family: Byturidae

Pronunciation

How to pronounce Byturidae: //bɪˈtjʊərɪdi//

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Images

Summary

Byturidae, or fruitworm beetles, are a small family of cleroid beetles characterized by their small size and specific feeding habits that include both adults feeding on flowers and larvae feeding on fruit. They are distributed in the Holarctic and Southeast Asia with several species being notable pests.

Physical Characteristics

Small beetles ranging in size from 2.5 to 5.5 mm. They possess fine, dense vestiture and a gently convex dorsum. They have eleven antennomeres with the last three forming a club. The pronotum is as wide as the elytra at the back and narrows toward the head, which is narrower than the pronotum.

Identification Tips

Look for the characteristic shape of the pronotum and the clubbed antennae. Size and fine vestiture are also distinguishing traits.

Habitat

Primarily found in areas where their larval food sources, such as native fruits and oak galls, are present. Adults are often found on flowers or developing leaves.

Distribution

Holarctic and Oriental regions; in North America, specific species like Byturus unicolor are found from Newfoundland and the Northwest Territories to Georgia and Texas; Xerasia grisescens is distributed in the western US.

Diet

Adults feed on developing leaves, flowers, and pollen, while larvae feed on fruits and, in the case of Xerasia grisescens, oak galls.

Ecosystem Role

They likely play a role in pollination as adults feed on flowers, and their larvae feed on fruit, which may influence fruiting and plant community dynamics.

Economic Impact

Some species, particularly Byturus, can be significant pests of commercially important plants like blackberries and raspberries by consuming fruit and seeds.