鯊魚牙化石

學名:Selachimorpha〈鯊總目〉

年代:新生代

發現地:摩洛哥

說明:

你知道嗎?透過小小一顆牙齒就可以協助判斷鯊魚的食性喔!

Did you know you could determine what a shark eats from a single tooth?

首先,以軟體動物或甲殼類為食的鯊魚,有較為扁平的牙齒方便輾碎食物;其次,以中小型魚類為食的鯊魚則有針狀的牙齒用來緊咬獵物;又次,以更大的動物,例如以海洋哺乳類為食的鯊魚,有著尖銳的下顎牙齒和鋸齒狀的上顎牙齒,分別用來抓住和切割獵物的肉;最後,以浮游生物為食的鯊魚(像是鯨鯊和姥鯊),則只有小型而無功能的牙齒。

Those who consume mollusks or crustaceans have flatter teeth useful for grinding their food; those who eat mid-sized fish have needle-shaped teeth to grasp their prey tightly; those who hunt even larger animals, such as marine mammals, have sharp mandibularis (teeth in the lower jaw) and jagged maxillaries (teeth in the upper jaw), used to seize, and cut, their victims’ meat respectively. Finally, some sharks (such as basking sharks or whale sharks) have tiny teeth which are rarely used. These sharks’ main source of food is plankton.

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