辽宁西部下白垩统反鸟类一新科——Alethoalaorvithidae fam.nov.  

ALETHOALAORNITHIDAE FAM.NOV.:A NEW FAMILY OF ENANTIORNITHINE BIRD FROM THE LOWER CRETACEOUS OF WESTERN LIAONING

作　　者：李莉[1] 胡东宇[1] 段冶[1] 巩恩普[2] 侯连海[3] 

机构地区：[1]沈阳师范大学古生物研究所,沈阳110034 [2]东北大学,沈阳110034 [3]中国科学院古脊椎动物与古人类研究所,北京100000

出　　处：《古生物学报》2007年第3期365-372,共8页Acta Palaeontologica Sinica

基　　金：现代古生物学和地层学国家重点实验室(中国科学院南京地质古生物研究所)基金(06311);生物地质与环境地质教育部重点实验室基金(BGEG0601);辽宁省教育厅科研基金(20060805)联合资助

摘　　要：记述发现于辽宁省朝阳县原家洼村中生代地层中的反鸟类一新科:真翼鸟科(Alethoalaornithidae fam.nov.)。由于该科鸟类具有肩胛骨直,第1、2指仍有爪,腓骨和胫跗骨不愈合,趾骨不太钩曲等特征,将真翼鸟科归入华夏鸟目(Cathayornithiformes)。真翼鸟科的特有特征包括:吻尖,齿少,牙齿退化的趋势明显,腕掌骨基本形成,乌喙骨远端宽,肱骨近端具明显的气窝,尾综骨长,跗蹠骨末端三趾骨等长且滑车末端基本处于同一水平面,趾骨爪长,不甚钩曲等。通过对新材料和其它早期鸟类的对比认为,反鸟类的灭绝不仅有自身构造的原因,还有它们所生活的生态环境多变的原因。In this paper we report a new family of enantiornithiness from the Early Cretaceous of western Liaoning. Alethoalaornithidae Fam. nov. The new family is assigned to Cathayornithiformes based on similar length of trochlea at the distal end of tarsometatarsus. The main features of Alethoalaornithidae are listed below： sharp beak; few and rudimentary teeth; carpometacarpus developed basically ;coracoid broad at the distal end; obvious foramina at the proximal end of humerus; long pygostyle; three digits of tarsometatarsus being the same in length with trochlea at the same height;and long claws,with no curves. The birds of the new family can be compared with enantiornithine birds in general morphology. It is important for us to understanding the evolution of the enantiornithine birds. Besides, we can infer that the their extinction is not only because of the conservative morphological structure itself but also the frequent changes of their living environment. Description of new genus and species Class Aves Linnaeus, 1758 Subclass Enantiornithes Walker, 1981 Order Cathayornithiformes Zhou et al., 1992 Family Alethoalaornithidae faro. nov. Diagnosis Long and sharper beak, a few teeth, general two pairs, at last three pairs; cervical heterocoelous; furcula process thin and long, its length equal to clavicles ramus; sternum carina processes well developed; humerus pneumatic foramina well preserved, having deep capital groove; metacarpal formed; with rudimentary manual digit claws, small and weak, two only; trochlea having same length at the distal end of tarsometatarsus; claw of digit very long, and longer than any pedal phalange. Genus Alethoalaornis gen. nov. Type species Alethoalaornis agitornis gen. et sp. nov. Etymology ＂ Aletho＂ Latin, means true; ＂-alo＂ Latin, wing. Diagnosis Same as the family. Alethoalaornis agitornis gen. et sp. nov.（Text-fig. 2, figs. 1-5） Holotype LPM （Liaoning Palaeontologic Museum） 00009, a complete individual （P I ）. The specimen stored in

关 键 词：真翼鸟 反鸟 演化 灭绝 辽西 

分 类 号：Q915[天文地球—古生物学与地层学]