A New Crown-Group Frog (Amphibia: Anura) from the Early Cretaceous of Northeastern Inner Mongolia, China
A New Crown-Group Frog (Amphibia: Anura) from the Early Cretaceous of Northeastern Inner Mongolia, China
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DOI：
10.1206/3876.1
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发表时间：
2017-03
影响因子：
1.5
通讯作者：
K. Gao;Jianye Chen
中科院分区：
文献类型：
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作者：
K. Gao;Jianye Chen
根据12具保存完好的变质后个体骨骼化石，对产于内蒙古呼伦贝尔大杨树盆地下白垩统光华组（龙江上段）（与义县组相当）的冠蛙群进行了新的命名和描述。新的分类单元，Genibatrachus baoshanensis，记录了另一种早白垩世无尾类动物，其骶前椎骨数量减少到8个，类似于西班牙和巴西的几种大致相同年龄的青蛙分类单元。新青蛙还显示了几个特征，是个体发育和胚胎发育信息，包括个体发育融合的腭蝶筛骨，和个体发育融合的肋骨后干椎骨的骨骺。此外，这一新发现将热河生物群早白垩世蛙类的地理范围向北扩展到东亚北纬50度附近。
ABSTRACT Based on 12 well-preserved skeletons of postmetamorphic individuals, a new crown-group frog taxon is named and described from the Lower Cretaceous Guanghua (upper part of Longjiang) Formation (stratigraphic equivalent of the world-famed Yixian Formation) exposed in Dayangshu Basin, Hulunbuir, in the far northeast of Inner Mongolia, China. The new taxon, Genibatrachus baoshanensis, documents another Early Cretaceous anuran having reduction of the presacral vertebrae to eight in number, similar to several frog taxa of roughly the same age from Spain and Brazil. The new frog also displays several features that are ontogenetically and phylogenetically informative, including ontogenetic fusion of the palatine to the sphenethmoid, and ontogenetic fusion of ribs to the diapophyses of the posterior trunk vertebrae. In addition, the new discovery extends the geographic range of Early Cretaceous frogs of the Jehol Biota northward to near the 50th parallel north in East Asia.