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21.
Mesonemestrius caii gen. et sp. nov. is the first record of Archinemestriinae (Nemestrinidae) to be described from Upper Cretaceous Burmese amber. Mesonemestrius caii can be attributed to the subfamily Archinemestriinae by the following characters: M1 ending posterior to the wing tip and supernumerary crossveins absent. Mesonemestrius is characterized by M1 bifurcating after the conjunction of M1+2+3 and a long straight R1. The discovery not only adds to the diversity of tangle-veined flies in Burmese amber, but also represents the youngest record of the ancient subfamily Archinemestriinae. 相似文献
22.
Lebanoculicoides bloudani a new species of Ceratopogonidae from the Lower Cretaceous ambers of Syria and Lebanon is studied. The new species is characterized, described, illustrated, and compared with the other fossil taxa of the same extinct genus. A key to the species of the genus Lebanoculioides is proposed. 相似文献
23.
Helius ewa sp. nov., one of the oldest representative of the genus Helius Lepeletier and Serville 1828 (Diptera: Limoniidae) from the Lebanese amber (Lower Cretaceous) is characterized, illustrated and described. The evidences of rapid evolution of the genus Helius are provided. The hypothesis on the origin of the evolution of this genus in Gondwana and the possibility of rapid radiation and expansion in Laurasia are discussed. A complete list of Cretaceous limoniids belonging to Helius is given. 相似文献