Buprestidae

Jewel Beetles, Metallic Wood-Boring Beetles

Subfamily Guides

Agrilinae
Buprestinae(jewel beetles)
Chrysochroinae(jewel beetles)
Polycestinae(jewel beetles)

is a large of beetles comprising approximately 15,000 described in 775 , commonly known as jewel beetles or metallic wood-boring beetles. are renowned for their brilliant iridescent coloration produced by structural coloration rather than pigments. Larvae, called flatheaded borers, develop in wood and plant tissues, with many species associated with dying or dead trees. Some species are serious forest pests, notably the emerald ash borer (Agrilus planipennis), while others are attracted to burned forests and can detect infrared radiation and smoke from distances up to 50 miles.

Agrilus sulcicollis by (c) Michael Knapp, some rights reserved (CC BY), uploaded by Michael Knapp. Used under a CC-BY license.

Agrilus derasofasciatus by (c) Michael Knapp, some rights reserved (CC BY), uploaded by Michael Knapp. Used under a CC-BY license.

Agrilus cuprescens by (c) Alexis Tinker-Tsavalas, some rights reserved (CC BY), uploaded by Alexis Tinker-Tsavalas. Used under a CC-BY license.

Pronunciation

How to pronounce Buprestidae: /bjuˈprɛstɪdiː/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from other by combination of: short, often serrated (sometimes clubbed or in males of certain groups); tarsal formula 5-5-5 with fourth segment small and concealed within expanded third segment; procoxal cavities open behind; and metallic iridescent coloration (structural, not pigment-based). Similar to Cerambycidae but with much shorter antennae and different tarsal structure. Distinguished from Elateridae by lack of prosternal process fitting into mesosternal cavity and different body form. Larvae identifiable by their characteristic flattened, broad-headed form with thoracic segments expanded—hence 'flatheaded borer' .

Images

Appearance

typically cylindrical to elongated-ovoid in shape, ranging from 3 to 80 mm in length, though most are under 20 mm. The largest include Catoxantha, Chrysaspis, Euchroma, and Megaloxantha. Coloration is highly variable and often spectacularly bright, with iridescent greens, blues, coppers, and purples produced by microscopic cuticular structures that reflect specific light frequencies rather than pigments. Some species display complex patterned coloration. The body surface is generally smooth and . are short to medium in length, usually serrate; males of some tribes (notably Xenorhipini) possess highly modified or antennae. Larvae are characteristically flattened, with the body region much broader than the rest, reaching up to 25 mm when fully grown.

Habitat

occur in diverse terrestrial , often associated with woody vegetation. Larval habitats are primarily internal: roots, stems, logs, and leaves of plants ranging from trees to grasses. Many favor dying or dead branches on otherwise healthy trees; some attack green wood. Certain species are strongly associated with recently burned forests, where they lay in fire-killed trees. plant specificity varies widely, from highly specialized to broadly .

Distribution

distribution with highest diversity in tropical and subtropical regions. Major faunas documented in North America, Europe, Australia, Southeast Asia, and Africa. Some have restricted distributions: Calodema, Castiarina, Metaxymorpha, and Temognatha are restricted to Australia and New Guinea; certain lineages show strong Gondwanan patterns. The emerald ash borer, native to Asia, has established in North America, Russia, and Ukraine.

Seasonality

activity patterns vary by region and . In temperate North America, many species are active from late spring through summer (May–August), with peak often in mid- to late spring. Some species exhibit prolonged or delayed emergence under adverse conditions. In Louisiana's subtropical climate, emerald ash borer shows adult emergence from April through June. Species associated with burned forests may show activity patterns tied to post-fire .

Diet

: Some feed on foliage, pollen, or nectar; others appear to take little or no food. Specific adult feeding habits are poorly documented for most species. Larvae: Phloem and wood-feeders, tunneling through cambium, sapwood, and sometimes heartwood of plants. Some species are leaf-miners or root-borers.

Host Associations

Fraxinus spp. (ash trees) - larval Primary for emerald ash borer (Agrilus planipennis); also hosts for other Agrilus
Populus spp. (cottonwoods, poplars) - larval for Poecilonota cyanipes, Agrilus granulatus, and other
Salix spp. (willows) - larval for Poecilonota and Agrilus quadriguttatus
Quercus spp. (oaks) - larval Highly favored supporting diverse buprestid fauna in eastern North America
Carya spp. (hickories) - larval Important in eastern North American deciduous forests
Pinus spp. and other conifers - larval for Chalcophora ('sculptured pine borers') and numerous other
Eucalyptus spp. - larval for Agrilus sexsignatus and other in Australia and introduced ranges
Recently burned or fire-killed trees - oviposition substrateSome specifically attracted to post-fire , detecting smoke and infrared radiation

Life Cycle

Complete . laid in bark crevices, leaf tissue, or other plant substrates. Larvae tunnel through plant tissue, typically requiring one to several years to complete development depending on and conditions. Some species exhibit exceedingly long under adverse conditions. occurs in pupal chambers constructed in wood or soil. emerge through exit holes. time varies: one year for emerald ash borer in Louisiana's subtropical climate; two or more years for many temperate species.

Behavior

are often , sun-loving, and quick to fly when disturbed—some (e.g., Chrysobothris) can escape rapidly in hot conditions. Many species are attracted to blacklights. Some species exhibit specialized fire-following : adults can detect pine wood smoke from up to 50 miles away and perceive infrared radiation, using these cues to locate burned forests for oviposition. Males of some groups use highly modified to detect female . Adults are frequently short-lived, with some Xenorhipis species living less than 48 hours.

Ecological Role

Larvae function as primary decomposers of dead and dying wood, contributing to nutrient cycling and carbon release in forest . Some act as secondary invaders, attacking trees already stressed by other factors. A few are primary pests capable of killing healthy trees. Fire-following species are pioneer colonizers of post-disturbance . As prey for woodpeckers and (especially Aulacidae and Encyrtidae), they support higher .

Human Relevance

Negative: Several are major forest and agricultural pests. The emerald ash borer (Agrilus planipennis) has killed millions of ash trees in North America and threatens ash in Europe. Other economically damaging species include Agrilus bilineatus (twolined chestnut borer) and Chrysobothria mali (Pacific flatheaded borer). Positive: are highly prized by insect collectors; of some species traditionally used in beetlewing jewelry and decoration in India, Thailand, and Japan. Some species serve as indicators of forest health or fire history.

Similar Taxa

Cerambycidae (longhorned beetles)Also wood-boring beetles with larvae in dead wood, but distinguished by very long (often longer than body), different tarsal structure, and generally less brilliant metallic coloration
Elateridae (click beetles)Similar body form in some and shared infraorder Elateriformia, but distinguished by prosternal process fitting into mesosternal cavity (enabling 'clicking' mechanism), different antennal structure, and lack of extreme metallic iridescence in most species
Bostrichidae (false powderpost beetles)Wood-boring beetles with some superficial similarities, but distinguished by different orientation, antennal club structure, and larval

More Details

Collection methods

Effective techniques for collecting include: beating dead branches of plants over a sheet; blacklighting at night in appropriate ; and rearing from infested wood collected in the field and held in breathable containers for months or years. Rearing provides definitive host associations and can yield difficult to encounter as free-living .

Taxonomic challenges

The is taxonomically difficult due to enormous , many small and morphologically similar , and incomplete regional revisions. Identification often requires examination of male genitalia and reference to scattered primary literature. Classification at level remains unsettled, with different systems recognizing 5–14 subfamilies.

Structural coloration

The brilliant colors of jewel beetles result from structural coloration: microscopic sculpturing of the creates thin-film interference and diffraction effects that selectively reflect specific wavelengths. This produces colors that can change with viewing angle and are more brilliant than pigment-based colors. The same physical principle creates the rainbow appearance of compact discs.