The first fossil hemipteran from the Late Jurassic of North America, Morrisonnepa jurassica n. gen. et n. sp., is reported and described from the Morrison Formation, Jurassic Salad Bar locality, San Juan County, Utah, USA. The new specimen is characterised and illustrated, showing morphological characters similar to nepomorphs such as forewing well-developed and folded flat on the abdomen, oval abdomen shape, and the presence of a short pair of appendages. The taxonomic allocation close to members of the Nepomorpha is discussed. Morrisonnepa jurassica n. gen. et n. sp. was collected with abundant plants, spinicaudatan carapaces, and a small amphibian from a finely laminated shale that overlies a coarser plant debris bed, supporting the presence of a possible oxbow lake or pond, environments developed within the greater ecosystem of the Morrison Formation during the Late Jurassic. In this context, we analyse the taphonomic and palaeoecological implications of the presence of aquatic insects. Besides providing morphological information on Jurassic nepomorphs, the new fossil helps illustrate how the aquatic insect assemblage was integrated during the Jurassic in North America.

来自北美侏罗纪晚期的第一个化石半萜，Morrisonnepa jurassica n。gen。等 在美国犹他州圣胡安县的侏罗纪色拉吧地区的莫里森地层中报道和描述了这种藻。对新标本进行了特征鉴定和说明，显示出与新形态相似的形态特征，例如，腹部发育良好并折叠成扁平状，腹部呈椭圆形，并有一小段附件。讨论了近乎线粒体成员的分类学分配。侏罗纪莫里森。gen。等 sp。收集了丰富的植物，棘金刚甲甲壳虫和小的两栖动物，它们来自层状较细的页岩，上面覆盖着较粗的植物残渣床，支持可能的牛弓湖或池塘的存在，并在后期莫里森组更大的生态系统内发展了环境侏罗纪 在这种情况下，我们分析了水生昆虫的存在对植物学和古生态的影响。除了提供有关侏罗纪新形态的形态学信息外，新化石还有助于说明北美侏罗纪期间如何整合水生昆虫。