A NEW SALAMANDER (AMPHIBIA: CAUDATA) FROM THE EARLY CRETACEOUS JEHOL BIOTA
A NEW SALAMANDER (AMPHIBIA: CAUDATA) FROM THE EARLY CRETACEOUS JEHOL BIOTA
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
Wang Yuan
中科院分区：
文献类型：
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作者：
Wang Yuan
根据保存良好的有孔虫骨骼标本，描述了一个新的有孔虫亚科--奇异热河螈（Jeholotriton paradoxus gen. et sp. nov.）早白垩世义县组下部沉积。热河螈的发现证明了中国第三种中生代蝾螈的发现。Jeholotriton与其他早期尾状动物的不同之处在于有一个前内侧指向的翼肌支，连接到头骨而不是上颌骨。它的特征还包括：犁突分离较宽，犁骨齿列纵向排列，鼻突大，无前切迹，额突无前外侧延伸，上颌弓短而不完整，无方轭，前上颌骨翼突突出，上颌骨短，冠状前关节融合且含齿，17个前骶骨，双凹椎骨，椎骨横突短，近端扩张的单头肋骨，指骨公式：手2-2-3-2，足2-2-3-3-2。
Based on well-Preserved impressions of articulated skeletons, a new urodele, Jeholotriton paradoxus gen. et sp. nov., is described from the lower part of the Yixian Formation (Early Cretaceous), Net Mongol, China. The discovery of Jeholotriton documents the third Mesozoic salamander from China. Jeholotriton differs from other early caudates in having an anteromedially directed ramus of pterygoid that connects to the skull table rather than the maxilla. It is also characterized by having widely separated vomers, longitudinal vomerine tooth row, large nasals with no anterior notch, frontal with no anterolateral extension, short and incomplete maxillary arcade with no quadratojugal, prominent alary process of premaxilla, short maxilla, fused and dentigerous coronoid-prearticular, 17 presacrals, amphicoelous vertebrae, short transverse processes of the vertebrae, proximally expanded unicapitate ribs, and phalangeal formula of 2-2-3-2 for manus and 2-2-3-3-2 for pes.