【摘要】 <正>蛙类和蟾蜍类是现存最高级的两栖类,不仅种类繁多,而且分布广泛。我国的蛙类化石仅发现于新第三纪和第四纪地层中,尤以山东山旺中新世玄武蛙(Rana basaltica)、强壮大锄足蟾(Macro-pelobates cratus)等最为有名。本文记述的蛙类化石产自辽宁西部北票市上园四合屯义县组下部,地层时代为晚侏罗世晚期。这是中国无尾两栖类在中生代地层中的首次发现,也是中国乃至东亚最早的蛙类化石,填补了侏罗世蛙类在大区域内的分布空白。该化石不仅进一步丰富了辽宁西部热河动物群内容,而且对研究早期蛙类的形态特征、分类演化及古动物地理有重要意义,具有重要的科学价值。更多还原

【Abstract】 ……Liaobatrachus grabaui gen. et sp. nov. within Pelobatidae, the first fossil anuran in the Meso-zoic strata of China, is featured mainly by: Maxillary teeth well developed and closely arranged i Presacral vertebrae nine, some in procoelous form; Transverse processes of Presacral II -IV more expanded and longer; Sacral diapophysis greatly expanded; Transverse processes of the urostyle present proximally; Pectoral girdle arciferal; Clavicle strongly curved; Forelimb short and thick, meanwhile the hindlimb longer; Tibiofibula as long as femur; Tarsalia two, and longer than the half of the tibiofibula. This frog hase the ability to jump to some extent.更多还原