Acetylated-triacylglycerols
Guides
Eurosta
goldenrod gall flies
Eurosta is a genus of seven North American gall-forming flies in the family Tephritidae. All species induce galls on goldenrod (Solidago) stems. The best-studied species, Eurosta solidaginis, creates spherical stem galls and has served as a model organism for research on freeze tolerance, host-race formation, and plant-insect coevolution. Research has demonstrated that Eurosta galls accumulate environmental contaminants at higher concentrations than surrounding plant tissues, suggesting potential use as pollution biosensors.
Eurosta solidaginis
Goldenrod Gall Fly, Goldenrod Ball Gall Fly
Eurosta solidaginis is a tephritid fruit fly that induces spherical stem galls on goldenrod plants (Solidago spp.). The species is notable for its freeze tolerance, surviving temperatures down to -80°C through the production of unique acetylated triacylglycerols that remain liquid at low temperatures. Populations exhibit host-race formation, with genetically differentiated populations associated with different Solidago host species showing assortative mating. The galls serve as nutrient-rich overwintering chambers and have been demonstrated to accumulate environmental contaminants at higher concentrations than surrounding plant tissues, making them useful as biological pollution detectors.