古鳄科(Proterosuchidae)或称加斯马吐龙科(Chasmatosuchidae),是一群早期基础主龙形类的集合群,可能是并系群。古鳄科生存于二叠纪最晚期的俄罗斯,与早三叠纪的南部非洲、俄罗斯、中国、澳洲、南极洲。牠们是体型细长、中等体型(约1.5米长)、长口鼻部、外表类似鳄鱼的动物,牠们缺乏真正鳄鱼的坚硬鳞甲,牠们骨骸的特征更为原始。牠们最独特的特征是明显往下凸出的前上颌骨(前上颌骨是上颌的前部),牠们的前上颌骨突出于下颌之上。四肢很短,且呈往两侧伸展姿势,类似现代的蜥蜴,但不类似较晚的主龙类。
分类
参考资料
- Michael Benton (2000), Vertebrate Paleontology, 2nd Ed.; (2004) 3rd edition Blackwell Science Ltd
- Robert L. Carroll (1988), Vertebrate Paleontology and Evolution, WH Freeman & Co.
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