本文记述了辽宁北票义县组一件新的初鸟类(Avialae)化石,这是继中华神州鸟(Shenzhouraptor sinensis Ji et al,2002)之后初鸟类化石的又一发现.它以上下颌无齿而具角质喙、胸骨发达且具龙骨突、前肢显著长于后肢等特征与始祖鸟(Archaeop...本文记述了辽宁北票义县组一件新的初鸟类(Avialae)化石,这是继中华神州鸟(Shenzhouraptor sinensis Ji et al,2002)之后初鸟类化石的又一发现.它以上下颌无齿而具角质喙、胸骨发达且具龙骨突、前肢显著长于后肢等特征与始祖鸟(Archaeopteryx)不同,以后肢第Ⅰ趾爪已反转而与其它3趾对握等特征与神州鸟相区别,该化石被命名为东方吉祥鸟(新属、新种)(Jixiangornis orientalisgen.et sp.nov.)中国辽西新近发现的中华神州鸟和东方吉祥鸟(新属、新种)目前是世界上最古老最原始真正具有角质喙和飞行能力的原始鸟类.展开更多
A recently collected specimen of Caudipteryx is described as a new species: C. dongi sp. nov. Compared with the type species of Caudipteryx (C zoui) the new species has relatively long iliums and smaller sternal plate...A recently collected specimen of Caudipteryx is described as a new species: C. dongi sp. nov. Compared with the type species of Caudipteryx (C zoui) the new species has relatively long iliums and smaller sternal plates. Uncinate Processes are present as in oviraptorids and most birds. The pubis is antero-ventrally directed as in most saurischian dinosaurs. The fibula contacts the calcaneum distally. Among the Pedal digits the third is the longest the fourth is shorter than the second, and the hallux is short with a reduced claw characteristic of cursorial animals. As in birds the hallux is opposable to the rest of digits, indicating that the ancestor of Caudipteryx might have obtained pershing or grasping power, therefore providing further evidence for the arboreal hypothesis of the origin of avian flight. The feather lacks barbules and represents either a more primitive type than in birds or a secondarily reduced one. Although Caudipteryx has several bird characters it is interpreted in this paper as a feathered dinosaur rather than a secondarily flightless bird. Caudipteryx resembles oviraptorids more than dromaeosaurids, yet it represents a lineage distinguishable from all known major maniraptorian clades, therefore we propose to erect a new family: Caudipteridae fam. nov. currently including only Caudipteryx. The characters of Caudipteryx also indicates that it was a fast running herbivorous animal.展开更多
初步记述了采自辽西地区早白垩世义县组新的原始鸟脚类恐龙化石材料，并依此建立一新属新种上园热河龙（Jeholosaurus shangyuanensis gen. et sp. nov.）。化石产于北票市上园镇陆家屯义县组下部第一段灰白色凝灰质砂岩中，同一层位产...初步记述了采自辽西地区早白垩世义县组新的原始鸟脚类恐龙化石材料，并依此建立一新属新种上园热河龙（Jeholosaurus shangyuanensis gen. et sp. nov.）。化石产于北票市上园镇陆家屯义县组下部第一段灰白色凝灰质砂岩中，同一层位产出过大量鹦鹉嘴龙化石。上园热河龙的主要鉴定特征包括6个前上颌齿，鼻骨背面发育小孔，前齿骨约为前上颌骨主体长度的1.5倍、未发育股骨前髁间沟、骨不在一平面上，第三趾趾节中第四节最长。上园热河龙具有一些真鸟脚类恐龙的近裔性状，比如眶前孔小，方骨孔大，位于方颧骨侧面，外下颌孔缺失。另外，上园热河龙的股骨近端形态非常接近进步的鸟脚类恐龙。但是上园热河龙发育有6个前上颌齿，上下颌关节处与齿列位于同一水平线，前上颌齿列与上颌齿列位于同一水平线，这些原始特征未见于已知鸟脚类恐龙。上园热河龙确切系统分类位置需要进一步确定。 上园热河龙是义县组中发现的第二种鸟臀类恐龙，增加了这类恐龙在热河生物群中的分异度。展开更多
文摘本文记述了辽宁北票义县组一件新的初鸟类(Avialae)化石,这是继中华神州鸟(Shenzhouraptor sinensis Ji et al,2002)之后初鸟类化石的又一发现.它以上下颌无齿而具角质喙、胸骨发达且具龙骨突、前肢显著长于后肢等特征与始祖鸟(Archaeopteryx)不同,以后肢第Ⅰ趾爪已反转而与其它3趾对握等特征与神州鸟相区别,该化石被命名为东方吉祥鸟(新属、新种)(Jixiangornis orientalisgen.et sp.nov.)中国辽西新近发现的中华神州鸟和东方吉祥鸟(新属、新种)目前是世界上最古老最原始真正具有角质喙和飞行能力的原始鸟类.
文摘A recently collected specimen of Caudipteryx is described as a new species: C. dongi sp. nov. Compared with the type species of Caudipteryx (C zoui) the new species has relatively long iliums and smaller sternal plates. Uncinate Processes are present as in oviraptorids and most birds. The pubis is antero-ventrally directed as in most saurischian dinosaurs. The fibula contacts the calcaneum distally. Among the Pedal digits the third is the longest the fourth is shorter than the second, and the hallux is short with a reduced claw characteristic of cursorial animals. As in birds the hallux is opposable to the rest of digits, indicating that the ancestor of Caudipteryx might have obtained pershing or grasping power, therefore providing further evidence for the arboreal hypothesis of the origin of avian flight. The feather lacks barbules and represents either a more primitive type than in birds or a secondarily reduced one. Although Caudipteryx has several bird characters it is interpreted in this paper as a feathered dinosaur rather than a secondarily flightless bird. Caudipteryx resembles oviraptorids more than dromaeosaurids, yet it represents a lineage distinguishable from all known major maniraptorian clades, therefore we propose to erect a new family: Caudipteridae fam. nov. currently including only Caudipteryx. The characters of Caudipteryx also indicates that it was a fast running herbivorous animal.
文摘初步记述了采自辽西地区早白垩世义县组新的原始鸟脚类恐龙化石材料，并依此建立一新属新种上园热河龙（Jeholosaurus shangyuanensis gen. et sp. nov.）。化石产于北票市上园镇陆家屯义县组下部第一段灰白色凝灰质砂岩中，同一层位产出过大量鹦鹉嘴龙化石。上园热河龙的主要鉴定特征包括6个前上颌齿，鼻骨背面发育小孔，前齿骨约为前上颌骨主体长度的1.5倍、未发育股骨前髁间沟、骨不在一平面上，第三趾趾节中第四节最长。上园热河龙具有一些真鸟脚类恐龙的近裔性状，比如眶前孔小，方骨孔大，位于方颧骨侧面，外下颌孔缺失。另外，上园热河龙的股骨近端形态非常接近进步的鸟脚类恐龙。但是上园热河龙发育有6个前上颌齿，上下颌关节处与齿列位于同一水平线，前上颌齿列与上颌齿列位于同一水平线，这些原始特征未见于已知鸟脚类恐龙。上园热河龙确切系统分类位置需要进一步确定。 上园热河龙是义县组中发现的第二种鸟臀类恐龙，增加了这类恐龙在热河生物群中的分异度。
