A new unstriped Ichthyophis is found in Yunnan, China, it is distinguished from its unstriped congeners in morphology by a combination of characters including HL(head length), the number of annuli(369–372), vertebrae...A new unstriped Ichthyophis is found in Yunnan, China, it is distinguished from its unstriped congeners in morphology by a combination of characters including HL(head length), the number of annuli(369–372), vertebrae(114), inner mandibular teeth(36) and premaxillary-maxillary(51). The new species is also distinguished from its closest neighbour congener by a significant genetic divergence which is greater than 5.8% in the mitochondrial COI gene and greater than 6.3% in the mitochondrial cyt-b gene. As the first unstriped Ichthyophis species found in China,it is also the second species of Caecilians(Amphibian:Gymnophiona) found in China.展开更多
记述产于辽宁省朝阳市早白垩世九佛堂组的一新反鸟化石。依据它所具有的"Y"形的叉骨;乌喙骨较宽且末端凹陷;胸骨侧突细长,并在远端扩大,将其归入反鸟亚纲。此外,依据新材料所特有的头骨结构,如吻长、粗壮;有具钩状的牙齿;额...记述产于辽宁省朝阳市早白垩世九佛堂组的一新反鸟化石。依据它所具有的"Y"形的叉骨;乌喙骨较宽且末端凹陷;胸骨侧突细长,并在远端扩大,将其归入反鸟亚纲。此外,依据新材料所特有的头骨结构,如吻长、粗壮;有具钩状的牙齿;额骨大而低等不同于其它反鸟亚纲鸟类的特点,建立新属新种:杨氏弯齿鸟Camptodontus yangi gen.et sp.nov.。新种隶属于长翼鸟科,与长翼鸟的某些特征相似。它的发现不但给反鸟类群增加了一重要新成员,同时也说明早期鸟类分化辐射的复杂性。展开更多
文摘A new unstriped Ichthyophis is found in Yunnan, China, it is distinguished from its unstriped congeners in morphology by a combination of characters including HL(head length), the number of annuli(369–372), vertebrae(114), inner mandibular teeth(36) and premaxillary-maxillary(51). The new species is also distinguished from its closest neighbour congener by a significant genetic divergence which is greater than 5.8% in the mitochondrial COI gene and greater than 6.3% in the mitochondrial cyt-b gene. As the first unstriped Ichthyophis species found in China,it is also the second species of Caecilians(Amphibian:Gymnophiona) found in China.
文摘记述产于辽宁省朝阳市早白垩世九佛堂组的一新反鸟化石。依据它所具有的"Y"形的叉骨;乌喙骨较宽且末端凹陷;胸骨侧突细长,并在远端扩大,将其归入反鸟亚纲。此外,依据新材料所特有的头骨结构,如吻长、粗壮;有具钩状的牙齿;额骨大而低等不同于其它反鸟亚纲鸟类的特点,建立新属新种:杨氏弯齿鸟Camptodontus yangi gen.et sp.nov.。新种隶属于长翼鸟科,与长翼鸟的某些特征相似。它的发现不但给反鸟类群增加了一重要新成员,同时也说明早期鸟类分化辐射的复杂性。
