蚤类是特化的昆虫类群之一。其成虫体小而竖扁、具刺吸式口器和发达的胸足,吸食宿主血液。全世界已知约2500种,在昆虫纲中是一个小目。随着上世纪末本世纪初,确定了蚤类是在历史上对人类造成危害最大的传染病——鼠疫的传播媒介,人们开始重视对蚤类的研究,因而蚤类研究在?.. Fleas are one of the specialized insect groups. Its adult body is small and vertical flat, piercing mouthparts and well-developed chest and legs, taking host blood. About 2,500 species are known throughout the world, and are an omnipresent in the Insecta. As the end of the last century, at the beginning of this century, it was determined that fleas were the most epidemic-plague-causing infectious agents in history and people began to pay attention to the study of fleas.