Bibionidae, also called March flies, is a widespread group of Nematocera and their fossils are very abundant in lacustrine deposits especially in the Oligocene and Miocene, but records as amber inclusions in the Mesozoic are quite rare. Here, we describe a new genus and species of March fly, Protopenthetria skartveiti gen. et sp. nov. from mid-Cretaceous Burmese amber. The new genus and species described and illustrated based on a well-preserved male specimen. A key to all known genera and species of Bibonidae from Burmese amber is given. The discovery of Protopenthetria skartveiti gen. nov. et sp. nov. provides evidence about the morphology of Bibionidae in the Mesozoic and illustrates the high diversity of the Burmese amber biota.

Bibion​​idae，也称为三月蝇，是一种广泛分布的线虫类，它们的化石在湖相沉积物中非常丰富，特别是在渐新世和中新世，但在中生代作为琥珀包裹体的记录非常罕见。在这里，我们描述了三月蝇的一个新属和种，Protopenthetria skartveiti gen。等 sp. 十一月 来自白垩纪中期的缅甸琥珀。根据保存完好的雄性标本描述和说明的新属和种。给出了缅甸琥珀中所有已知的 Bibonidae 属和种的关键。Protopenthetria skartveiti gen的发现。十一月 等 sp. 十一月 提供了关于中生代 Bibion​​idae 形态的证据，并说明了缅甸琥珀生物群的高度多样性。