摘要
A new Megaselia species: Megaselia angustirostris Fang & Liu, sp. nov., is described and illustrated and two species of the genus, M. nigra (Meigen) and M. albicaudata (Wood), are reported for the first time from China. The type specimens are deposited in College of Biological and Environmental Engineering, Shenyang University.
记述中国异蚤蝇属1新种:狭喙异蚤蝇Megaselia angustirostris Fang & Liu,sp.nov.,及2新记录种:黑异蚤蝇Megaselia nigra(Meigen)和白尾异蚤蝇Megaselia albicaudata(Wood),模式标本存放于沈阳大学生物与环境工程学院。狭喙异蚤蝇Megaselia angustirostris Fang&Liu,新种(图1-4)雄:额黑色,宽与侧高之比为1.74∶1,额面散布细毛约40根,纵沟明显。触角上鬃2对,近等;上对间距略小于上额间鬃间距。下额间鬃略低于下额眶鬃,位于下额眶鬃与上对触角上鬃之间。上额间鬃低于上额眶鬃,四根鬃不等距排列,中间两根间距略小。触角第3节黑色,无皮下感觉孔;芒明显长于额宽,具微毛。下颚须黑色,细长,鬃发达。喙延长、褐色;唇瓣狭长,端尖。胸部黑色。中侧片具均一的毛。背侧鬃3根,无背侧裂。小盾片鬃1对。腹部黑色。各节背板稀布细毛,仅第Ⅵ节背板后缘毛略长。第Ⅴ-Ⅵ节腹面具短毛。背板Ⅱ-Ⅵ近等长。尾器黑色,生殖背板两侧具若干鬃状毛。肛管黑色,短于生殖背板的背面长度;端毛略粗壮于尾须上的毛。足黑色,前足色较浅;前足跗节粗壮,基跗节膨大;后足基部腹缘毛短于端部腹缘毛;胫节缺前背纤毛,后背纤毛纤细。翅几乎透明无色,脉褐色或黑褐色;前缘脉指数0.41-0.44,前缘脉比3.59∶1.81∶1,前缘纤毛约0.11mm,Sc不伸达R1,Rs脉基部具1微毛。腋鬃4-5根。平衡棒黑色。体长:1.6-2.3mm。雌:与雄虫相似。在Borgmeier(1966)检索表中,M.angustirostris可查至第IV组第15项或第V组第2项,但本种的窄喙明显区别于其他种。正模:♂,甘肃张掖,2004-Ⅷ-15,方红、韩红涛采;副模:37♂♂6♀♀,同正模。
基金
supported by the National Natural Science Foundation of China(30270187)