抚顺始新统琥珀中蚜类化石的发现及其意义

DISCOVERY OF EOCENE APHIS (INSECT: HOMOPTERA) IN AMBER FROM FUSHIJN, LIAONING PROVINCE, CHINA

辽宁抚顺下第三纪含煤地层发育,其中古城子组主煤层以盛产琥珀闻名中外,琥珀中含有大量昆虫化石。本文重点记述产自该组琥珀中的同翅目扁蚜科的一个新属——乐氏蚜属。

The Eocene system of Fushun, Liaoning Province is widely distributed, and well developed, and the Guchenzi formation (E21g) is abounded with coal and amber in it. In this paper, a new genus Eocene Yueaphis (Homoptera, Insecta) in amber from the Guchengzi formation (E21g), Fushun west coalfield and here together with the stratigraphic section has been described.HomopteraAuchenorrhynchaAphidoidea Baker, 1920Hormaphidea Mordriko 1908 (= Hormaphidae Baker, 1920; Hormaphidae Heie, 1980) Yueaphis gen. nov.Type species: Yueaphis fushunensis gen. et sp. nov. (P1. 1, figs. 1-4, text figs. 1)Diagnosis: Body small or medium in size brown-black-colored, about 1mm in length. Head smaller than living species in Astegopteryx xinglongensis Zhang, Ceratovacuna lanigera Zehntner and Neolheracaphis hangzhouensis Zhang. Antenna of 5 joints, sensorium rouned. Prothorax distinctly broader than the head, mesothorax well developed, metathorax small, Sctl2 small and semicircular. Second tasal segment two times longer than the first tarsal segment. Forewing broader and longer than hindwing. The base of vein Rs and M degenerated. M with a short fork at apex. Fork CuA, and CuA2 broa, CuA, combinating with CuA2 as a stem, the stem distinctly expanded. Abdomen broader than thorax. Siphunculus ringlike. Anal plate with two lobes, caudal plate elliptical, anal and caudal plate with hair. Monotypic new genus includes the type species: Yueaphis fushunensis sp. nov..Comparison: This genus is similar to Mindarus Backer, but differs in having CuA stem and the second joint of antenna is not longer than the third.