浦东拟黑麻蝇三龄幼虫记述(双翅目:麻蝇科)

摘要

调查中在上海浦东芦苇荡里的死螃蜞体内发现三龄幼虫,经饲养羽化出浦东拟黑麻蝇Beziella pudongensis Fan,Chen et Lu,sp.n.(武夷科学,待发表)雄、雌成虫.本新种三令幼虫记述,亦是拟黑麻蝇属中的幼虫首次报道. 本新种与黑尾黑麻蝇Helicophagella melanura(Meigen)的雄虫虽貌似而不近缘,本文从它们三龄幼虫的体壁、口咽器、前气门、后气门、后突起群的突形等都有很大差异,而生态习性也显然不同,黑尾黑麻蝇幼虫常在人、畜粪中发现,是住区常见蝇种之一,而浦东拟黑麻蝇幼虫仅在大片芦苇荡地表的死螃蜞体内发现.两者绝非近缘属、种.%The third stage larva here described were collected from a dead body of amphibious crab in a reedy marsh at Pudong, Shanghai, China. After rearing them, both sexes of Beziella pudongensis Fan, Chen et Lu (as new species in press, the paper will be published in the journal"Wuyi Science" ) were identified.The third stage larva of the genus Beziella Enderlein is described for the first time.Present species in male is superficially similar to that of Helicophagella melanura (Meigen),but not closely related. According to present study, the characteristics including cephalopharyngeal sclerites, anterior and posterior spiracles, perispiracular tubercles etc. between them are well different. They also differ in bionomics that H. melanura is well known as a common synanthropic fly breeding mainly in human and animal excrement, whereas the larvae of present species being found from a dead amphibious crab on ground in a broad reedy marsh near sea wall. Evidently, they are not close relatives.