Brachys ovatus
(Weber, 1801)
Oval Jewel Beetle
Brachys ovatus is a small metallic wood-boring beetle in the Buprestidae. It is the largest of the three Brachys occurring in Missouri, typically exceeding 5 mm in length. The species is a leaf-miner, with larvae developing within oak leaves rather than boring through wood. It is widely distributed across Central and North America.
Pronunciation
How to pronounce Brachys ovatus: /ˈbræ.kɪs oʊˈveɪ.təs/
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Identification
Distinguished from Missouri's two other Brachys by its larger size (exceeding 5 mm), the dense row of long hairs on the apex of the last abdominal sternum, and the white-margined band of bronze before the elytral apex combined with longitudinal rows of bronze setae in the basal half of the .
Images
Habitat
Mature hardwood forests, particularly white oak forests. Associated with oak trees where larvae mine leaves.
Distribution
Central America and North America. Documented in Canada (New Brunswick, Ontario, Québec) and throughout the United States.
Seasonality
Active during spring. have been collected on oak during springtime in Missouri.
Host Associations
- Quercus - larval Leaf-miner of oaks. Collected on ten of Missouri's 21 oak , including both 'white oaks' and 'red oaks'. Few reliable rearing records exist to document the full range of .
Behavior
are found on oak foliage. Larvae are leaf-miners, developing within oak leaves rather than boring through wood as is typical of most Buprestidae.
Ecological Role
Leaf-miner on oaks. Part of the forest insect associated with hardwood .
Similar Taxa
- Brachys aerosusSmaller (3-5 mm), highly variable, with basal elytral region largely lacking and showing purple, blue, or green luster; predominantly gold to bronze pubescence on . Commonly associated with various hardwoods besides oak, though suspected of being a .
- Brachys aeruginosusSmaller (3-4 mm), with predominantly light gold to silver setae covering area of . Most similar to B. aerosus in appearance.
Misconceptions
Older literature reports of this mining leaves of beech, elm, hickory, and hornbeam are questionable and may refer only to incidental associations rather than confirmed larval . Reliable rearing records are scarce.
More Details
Subspecies
Two are recognized: Brachys ovatus ovatus (Weber, 1801) and Brachys ovatus bellporti Nicolay & Weiss.
Taxonomic notes
Member of tribe Trachyini, characterized by highly derived (flat, compact, wedge-shaped) compared to other Buprestidae, associated with their unique larval habit of leaf-mining rather than wood-boring.