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中生代海生爬行动物的研究在古脊椎动物学中占有重要地位.其中鳍龙类和鱼龙类很早就引起了古生物学家的关注,但直到今天对这两个类群的确切祖先及各自内部成员间的关系仍然存在争论[1～3],它们最初被置于调孔亚纲,目前被认为是特化的双孔类.鳍龙类被大多数人视为鳞龙类的姐妹群
The study of the Mesozoic marine reptiles plays an important role in the ancient vertebrate zoology, of which the dinoflagellates and the Ichneumones have long attracted the attention of paleontologists, but until today the exact ancestors of these two groups and their internal The relationship between members is still controversial [1 ~ 3], they were originally placed in the subfamily Porphyry, now considered to be a specialized double-hole class. Fin dragon is considered by most people as slender sister group