"This is a large group of 210 described species, all restricted to the Americas. Most species are primary plant feeders causing simple swellings on stems, tendrils, or petioles of various plants, or living in flowers or achenes of Asteraceae. Most appear to be associated with symbiotic fungi, at least some of the time, but some evidently are not. A few are inquilines in galls of other cecidomyiids. Except for the speciose and diverse Neolasioptera, remaining genera are small but distinct and are each restricted to a particular host group."
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