最重要的是,对古生物学家礼貌地描述中的粪化石的研究表明,有些粪便中有鹦鹉螺的壳。
Based on comparisons with modern evacua, these are probably from sharks.
随着现代技术的发展,研究表明这些粪便来自于鲨鱼。
But which sharks?
但是哪种鲨鱼吃鹦鹉螺呢?
Dr Vullo s ammonite nails one culprit.
Vullo博士的化石标本确定了其中的一个罪魁祸首。
The tooth belongs to a species called Planohybodus.
化石中鹦鹉螺外壳上的牙齿属于一种叫做平弓鲨的物种。
And that is a surprise. Those modern sharks that eat shelled animals have robust teeth forcrunching through hard exteriors.
这是一个惊喜的发现。觅食有壳动物的现代鲨鱼通常长着强壮的牙齿,可以咬穿坚硬的外壳。
The teeth of Planohybodus, in contrast, were slender and pointed-the sort usuallyassociated with grasping and tearing at flesh.
相反,平弓鲨的牙齿,是那种纤细而突出的,一般让人联想到抓住和撕裂肉。
In a modern predator, that would indicate the habit of eating fish.
在现代掠食者中,拥有这种牙齿意味着习惯吃鱼。
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