Tracheini

Adults of Tracheini are generally small-bodied buprestids, typically 3–10 mm in length. Members of Habroloma often exhibit metallic coloration, while some genera such as Leiopleura display distinctive camouflage patterns resembling bird droppings. The tribe can be distinguished from other Agrilinae by a combination of morphological characters including antennal structure and body form, though precise identification to genus requires examination of specific characters. Larvae create characteristic full-depth linear-blotch mines in leaves, with pupation occurring within the mine.

Tracheini inhabit environments supporting their host plants, ranging from primary evergreen forests to more open habitats. Japanese species occur in forests dominated by Castanopsis sieboldii and in epiphytic situations. South American species occupy diverse vegetation types where suitable host plants grow. The tribe shows ecological flexibility, with some species associated with forest canopy trees and others with understory shrubs or epiphytes.

The tribe has a wide distribution across multiple continents. In the Japanese Archipelago, 32 species have been recorded (12 Habroloma, 20 Trachys). South American representatives include Leiopleura venustula. The tribe occurs in North America, Europe, Asia, and South America, with highest documented species diversity in eastern Asia.

Larvae feed as leaf miners, consuming mesophyll tissue of mature leaves in full-depth linear-blotch mines. Adults feed on host plant leaves, though specific feeding details are poorly documented for most species.

Larvae develop as leaf miners, creating full-depth linear-blotch mines in mature leaves and pupating within the mine. Adults emerge from pupae reared from leaf mines. In Habroloma species associated with Symplocos, young larvae bore into midribs and petioles, causing leaf fall, then continue mining in fallen leaves.

Some species exhibit notable defensive adaptations. Leiopleura venustula employs bird-dropping masquerade: its coloration resembles older dry bird droppings, and it secretes highly convoluted wax filaments from dorsal pores that mimic the white uric acid found in bird feces. Adults of most species are found on host plant foliage and are capable of rapid movement typical of buprestids.

Tracheini function as herbivores of mature leaves on woody and subwoody plants. Their leaf-mining habit creates distinctive damage patterns on host foliage. The unique mining strategy of some Habroloma species, which cause premature leaf abscission, may influence host plant phenology and nutrient cycling in forest ecosystems.

Some species are minor pests of cultivated plants, including fruit trees (Malus, Prunus) and ornamental shrubs (Rosa). The distinctive leaf mines can serve as indicators of beetle presence for monitoring purposes. The tribe has received recent taxonomic attention with descriptions of new species from Japan.

• AgriliniAnother tribe in subfamily Agrilinae; distinguished by larval habits (Agrilini typically bore in wood or stems rather than mine leaves) and adult morphological characters
• CoraebiniTribe in Agrilinae with different host associations and larval biology; adults often larger and with different body proportions

• leaf miner
• Buprestidae
• Agrilinae
• jewel beetle
• herbivory
• camouflage
• epiphyte associate

• BugGuide
• iNaturalist taxon
• Buprestidae | Beetles In The Bush | Page 6
• “Playing poop”: an interesting case of bird dropping masquerade in leafmining Buprestidae (Agrilinae, Tracheini)
• Diversity and larval leaf-mining habits of Japanese jewel beetles of the tribe Tracheini (Coleoptera, Buprestidae)
• Erratum: Corrigendum: Kato M, Kawakita A (2023) Diversity and larval leaf-mining habits of Japanese jewel beetles of the tribe Tracheini (Coleoptera, Buprestidae). ZooKeys 1156: 133-158. doi: 10.3897/zookeys.1156.97768.