金龙鱼是一种名贵的观赏鱼类,属于骨舌鱼超目骨舌鱼目骨舌鱼科。骨舌鱼类是真骨鱼中较古老的类群,现生骨舌鱼类除北美的舌齿鱼以外,均分布于南大陆的热带和亚热带的淡水水域中,如南美的巨骨舌鱼和骨舌鱼,澳洲和东南亚的金龙鱼,非洲的异耳鱼。化石骨舌鱼类基本上发现于除南极以外的世界各大陆的陆相沉积中。淡水鱼类的这种跨洋分布,给骨舌鱼类动物地理学的解释带来了很大的困惑。近期,研究者报道了在我国首次发现的骨舌鱼科金龙鱼 Arowana is a valuable ornamental fish, belonged to the bone fish tongue superfamily fish head bifidae fish Branch. Bony tongue fish is the oldest group of bony fish, and nowadays the bony tongue fish are distributed in the tropical and subtropical freshwater waters of South China except North American tongue-tailed fish, Gullet fish, Australia and Southeast Asia’s Arowana, Africa’s soleus. Fossil turtles are found mostly in continental deposits of all continents except Antarctica. This trans-oceanic distribution of freshwater fish brings great confusion to the explanation of the geography of the fossil fish. Recently, the researchers reported the first discovery of the genus Myrosaurid in our country