Mycangium
Guides
Dendroctonus adjunctus
roundheaded pine beetle
Dendroctonus adjunctus, commonly known as the roundheaded pine beetle, is a bark beetle native to North America that infests and kills pine trees. Adults are 5–6 mm long with shiny, dark brown to black exoskeletons covered in hairs. The species has a one-year life cycle, with adults colonizing weakened pine trees in autumn, constructing extensive egg galleries in the cambium and phloem. Outbreaks can be devastating, killing up to 50% of pines in pure stands. The beetle is distributed across the southwestern United States and Mexico, and is considered a serious pest of commercial and wild pine stocks.
Euwallacea fornicatus
tea shot-hole borer, polyphagous shot-hole borer, PSHB
Euwallacea fornicatus is an invasive ambrosia beetle (Coleoptera: Curculionidae: Scolytinae) native to Asia that has established populations in North America, Israel, South Africa, Australia, and South America. It is now recognized as part of a cryptic species complex containing at least four distinct species (E. fornicatus, E. fornicatior, E. whitfordiodendrus, and E. kuroshio) that are morphologically indistinguishable but genetically distinct. The species is a significant economic pest of tea, avocado, citrus, and numerous ornamental and native trees, acting as a vector for Fusarium fungi that cause Fusarium dieback disease.
Xyleborus affinis
sugarcane shot-hole borer
Xyleborus affinis is a highly widespread ambrosia beetle native to the American tropics, now found in tropical and subtropical regions worldwide. It cultivates symbiotic fungi in galleries bored into decaying wood, feeding exclusively on these fungal gardens. The species exhibits facultative eusociality with delayed dispersal of adult offspring, who assist with nest maintenance and brood care. Females are the dispersing sex and are strongly attracted to ethanol and specific host plant volatiles. Despite frequent association with declining trees, it primarily colonizes wood already in early decay rather than causing primary mortality.
Xylosandrus amputatus
Xylosandrus amputatus is a species of ambrosia beetle in the weevil family Curculionidae, subfamily Scolytinae. The species has been used as a model organism in studies of mycangial structure, with micro-CT scanning revealing detailed three-dimensional anatomy of its fungus-storing organs. It is known from North America and Southern Asia. Like other ambrosia beetles in the genus, it engages in obligate mutualism with fungi, carrying symbionts in specialized internal structures called mycangia.