OSTabbr.科学与技术处(=office of science and technology)abbr.作战适用性试验(=operational suitability testing)Osteoden.奥斯特鲁达(在波兰；东经 19º59' 北纬 53º42')

1. The diversity and relatively high level of evolution of these fossil short-horned flies suggest a differentiaion of the angiosperms group prior to the Late Jurassic.
   虻类化石较高的演化水平和多样性显示被子植物群的分化还略早于晚侏罗世。