A new Early Cretaceous Anuran amphibian from Northeast China
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摘要:
描述了发现于中国东北地区中生代地层中的蛙类化石一新属、新种，即莫旗蒙蟾（新属、新种）Mengbatrachus moqi gen.etsp.nov.。化石产于内蒙古自治区最东部与黑龙江省相邻的莫旗。该类化石的的主要特征如下：头宽大于头长，上颌骨和前颌骨具有密集排列的牙齿；两鼻骨在中线相接；副蝶骨长条状；翼骨较大，鳞骨、上肩胛骨发育，乌喙骨近端膨大显著；荐前椎8个，脊椎横突发育；第Ⅱ-Ⅳ荐前椎具有短粗肋骨；肋骨单头，近端膨大；荐椎横突呈近似棒状，远端仅稍加宽；尾杆骨上有一对椎后横突；胫跗骨和腓跗骨仅在近端和远端愈合。这是除辽蟾外，在中国发现的另一新的中生代无尾两栖类化石。
Abstract:This paper describes a new genus of Early Cretaceous batrachian fossil discovered in Longjiang Group in Daur Autonomous Banner of Morin Dawa, east Inner Mongolia. The new type mainly has the following characteristics:The width is longer than the length of its head. There are lots of teeth on the maxillary and the premaxillary. Two nasals are connected in the middle line. The parasphenoid is like a stripe. The pterygoid is big. The squamosal and the surpascapula are all preserved well. The near-end place of the coracoid is obviously intumescentia. The new specimen has 8 opisthocoelous presacrals with developed transverse processes, and its second to the fourth presacrals have free ribs. Only the near-end places of the ribs are intumescentia. The sacral has hatchetshaped transverse processes. The urostyle has transverse processes at the near-end place. The tibiale and the fibulare cicatrize only at the near-end and the far-end places. This specimen is another new discovery of Mesozoic anuran fossils in China, in addition to Liaobatrachus.
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Key words:
- fossil anura /
- Mesozoic /
- Northeast China
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表 1 GMC V2440前后肢各骨长度对比
Table 1. Lengths of the forelimb and the posteriorlimbs of GMC V2440
前肢 后肢 肱骨21mm 股骨35mm 桡尺骨16mm 胫腓骨34mm 腕骨6mm 胫跗骨19mm+腓跗骨20mm 掌骨5mm 蹠骨6~7mm 指骨指式2-2-2-1，最大8mm 趾骨趾式2-2-3-2-1，最大29mm 
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