白垩纪中期克钦琥珀毛蚊科(双翅目:毛蚊总科)昆虫一新属新种

A new genus and species of Bibionidae (Diptera:Bibionoidea) from mid-Cretaceous Kachin amber

毛蚊科是双翅目长角亚目的一类昆虫,其种类丰富,广布世界各地。毛蚊化石记录较为丰富,但往往都是保存于湖相沉积地层中,琥珀中的化石较为罕见。本文根据缅甸北部克钦地区产出的白垩纪中期琥珀中保存的昆虫标本建立了1新属新种——缅甸白垩叉毛蚊(Cretpenthetria burmensis gen. et sp. nov.),归入毛蚊科。本新属与毛蚊科其他属的主要区别在于:1)触角细长,长度是头部长度的2倍;2) Sc终止于翅中部且于R2+3+4+5基部1/3处;3) R2+3与R2+3+4+5和Rs长度相等。该标本的发现不仅提高了白垩纪克钦琥珀中毛蚊类的生物多样性,也为毛蚊科的早期演化提供了重要的三维形态学证据。

A new genus and species, Cretpenthetria burmensis gen. et sp. nov., is established and attributed to the family Bibionidae on the basis of a new well-preserved specimen from mid-Cretaceous amber of Kachin State, northern Myanmar. The new genus differs from other genera within Bibionidae in the following characteristics: 1) antennae elongated, about twice longer than head length;2) vein Sc ending about at wing mid-length and opposite of basal 1/3 length of vein R2+3+4+5;3) R2+3 equals in length to R2+3+4+5 and Rs. This finding improves not only the palaeodiversity of Bibionidae in Cretaceous amber, but also provides important three-dimensional morphological evidence for the early evolution of Bibionidae.