古生物学家在蛇颈龙化石上发现巨大鲨鱼牙齿(1)
2009-10-02 08:37:21
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科学家设想的远古鲨鱼咬食蛇颈龙的情景
蛇颈龙
据英国《每日电讯报》9月30日报道,美国古生物学家日前在一个8米多长的蛇颈龙化石上,发现了80多颗巨大的鲨鱼牙齿。进一步的研究发现,这只蛇颈龙当年曾遭一群远古鲨鱼的围攻,甚至可能沦为它们的食物。
芝加哥德保罗大学古生物学家研修岛田(Kenshu Shimada)在研究1968年在日本发现的一具蛇颈龙骨骼化石时,发现了80多颗巨大的牙齿。根据对牙齿的研究发现,它们属于一种名为Cretalamna appendiculata的古鲨鱼,是现代大白鲨的祖先。从牙齿的大小形状判断,这些牙齿可能属于7条古代鲨鱼的,包括两条成年鲨鱼和5条小鲨鱼。
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