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A new genus and species of Stratiomyidae, Gigantoberis liaoningensis, is described from the Lower Cretaceous of western Liaoning Province based on a well-preserved, complete specimen. This is the first fossil record of a soldier fly so far described from China. It was armed with a specialized mouth part (proboscis and labella) and its huge body and short wings imply that it was a pollen eater and a poor flier.