Buprestis confluenta
Say, 1823
Yellow-spotted Jewel Beetle
Buprestis confluenta is a striking metallic wood-boring beetle distinguished by its emerald green to coppery-brown coloration with dense, more or less confluent yellow flecks across the . The is primarily associated with dead cottonwood (Populus deltoides) and quaking aspen (Populus tremuloides) in central and western North America. Despite the abundance of suitable trees in some regions, it remains uncommonly encountered and is considered elusive by collectors. are typically found on large, dead, barkless cottonwood trunks.
Pronunciation
How to pronounce Buprestis confluenta: /buːˈprestɪs kɒnˈfluːɛntə/
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Identification
Buprestis confluenta is readily distinguished from other North American Buprestis by its brilliant green to coppery-brown ground color combined with dense, fine yellow flecks that are more or less confluent across the —hence the species name "confluenta." The yellow spotting pattern is distinctive and denser than in related species. It is larger and more robust than many Chrysobothris species, with which it might be confused, and lacks the elytral patterns seen in B. striata. The related B. rufipes, which may occur sympatrically, typically shows reddish legs and different elytral coloration.
Habitat
Associated with riparian and woodland containing large Populus trees, particularly dead or dying cottonwood and quaking aspen. are found on standing dead trunks and recently fallen trees that have lost their bark, exposing the wood surface. The shows a strong preference for large-diameter trees in advanced stages of decay.
Distribution
North America, with records from central and western United States and Canada. Documented from Alberta and British Columbia in Canada, and from Oklahoma, Kansas, and Missouri in the United States. The easternmost records extend to Quebec and Indiana. The distribution follows that of its primary larval , cottonwood and quaking aspen.
Host Associations
- Populus deltoides - larval cottonwood
- Populus tremuloides - larval quaking aspen
Behavior
are notably calm and disinclined to flee when approached, unlike many other buprestid beetles. They are active on dead tree trunks during daylight hours. The is not strongly skittish and does not take as readily as Chrysobothris species.
Ecological Role
Larval development in dead and dying Populus trees contributes to wood decomposition and nutrient cycling in riparian forest .
Human Relevance
Collected by entomologists and enthusiasts due to its striking appearance and relative rarity. The has eluded some experienced collectors for decades despite intensive searching.
Similar Taxa
- Buprestis rufipesOccurs sympatrically on similar ; distinguished by reddish legs and different elytral coloration without dense confluent yellow flecking
- Buprestis striataSimilar size and ; distinguished by rather than flecked elytral pattern
- Buprestis salisburyensisAnother large, striking Buprestis ; differs in elytral color pattern and associations