小异长足虻属额宽率的进化意义及一新属五新种记述(双翅目,长足虻科,异长足虻亚科)  

THE EVOLUTIONARY SIGNIFICANCE ON FR /FA RATIO OF CHRYSOTUS MEIGEN(DIPTERA,DOLICHOPODIDAE,DIAPHORINAE),WITH DESCRIPTIONS OF ONE NEW GENUS AND FIVE NEW SPECIES

作　　者：魏濂艨[1] 

机构地区：[1]贵州省安顺市疾病预防控制中心,安顺561000

出　　处：《动物分类学报》2012年第3期611-622,共12页Acta Zootaxonomica Sinica

基　　金：国家自然科学基金(3920015);中共贵州省委高层次人才特助经费;贵州省科学技术基金的部分资助~~

摘　　要：研究发现小异长足虻属Chrysotus Meigen,1824中某些类群所具备的"额渐次变狭,颜颇宽、略下凹、两侧缘平行"的额、颜构造特征与异长足虻属Diaphorus Meigen,1824完全相同,该特征在两者中应属系统发育特征;并主要据此特征将小异长足虻属中凡具备"额渐次变狭,颜颇宽、略下凹、两侧缘平行"特征的类群分离出来,建立了变长足虻属Dubius gen.nov.,并附新属5新种记述:秋变长足虻D.autumnalus sp.nov.,曲变长足虻D.curtus sp.nov.,额变长足虻D.frontus sp.nov.,红崖变长足虻D.hongyaensis sp.nov.和亚曲变长足虻D.succurtus sp.nov.。根据变长足虻属,仅分布于新热带区和属东洋区的中国西南地区推测其可能起源于南方古陆(冈瓦纳古陆),并早在冈瓦纳大陆裂解前即向东洋区扩散。模式标本保存于作者所在单位。In the present paper,a group of species separated from Chrysotus M eigen,1824 is establishied as new genus,Dubius gen.nov.,of which five new species from Guizhou,Southwestern China are described：D.autumnalus sp.nov.,D.curtus sp.nov.,D.frontus sp.nov.,D.hongyaensis sp.nov.and D.succurtus sp.nov.It may be reasonable conjecture that Dubius gen.nov.derives from the Southern land（Gondwana land） and spreads to Oriental Region because the new genus is only found in Neotropical Realm and Southwestern China belonging to Oriental Region.Dubius gen.nov.Size small.Antenna black,is situated at mid and lower part of head.First fragellomere short and small,length shorter than width.Arista apically,short pubescent.6 dc.Irregularly paired acr short and hairlike.Scutellum with 2 pairs of bristles,basal pair short and hair-like.Propleuron with 1 black hair and 1 black bristle on lower part.M id and hind coxae each with 1 outer bristle.Claws usually present.Pulvilii as a rule undeveloped.R4 ＋5 and M parallel apically.CuAx ratio more than 0.3（the individual distributed in Neotropical Region with CuAx ratio reaching up to 0.7）.Halter yellow to dark yellow,individual brownish black.T g6 with setulae.St8 without strong long bristles.Epandrium round posteriorly.Surstylus usually tapering and slightly curved apically,but Neotropical ones remarkably straight.Cercus is small lob-like,unfurcated.Lateral epandrial lobe developed.Hypandrium usually expanded and with process apically.T ype species：Dubius curtus sp.nov.T he new genus is allied to Chrysotus M eigen,1824,but differs in：1） body larger;2） the formation of frons and face as in Diaphorus M eigen,1824（frons narrow,and face wider,slightly concaved and parallelsided,fr /fa ratio usually less than 1.0） ;3） antennae issituated at mid and lower part of head.Etymology.T he new genus name is from the Latin word ＂Dubius＂,in reference to the variation of frons.Key to the species of Dubius gen.nov.1.Fr /fa ratio more than 1.0.Antennae is situated at mid and upper pa

关 键 词：双翅目 长足虻科 异长足虻亚科 新属 新种 系统发育 

分 类 号：Q969.451.3[生物学—昆虫学]