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Why do shark teeth vary so much among species?
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shark
Shortfin mako shark (Isurus oxyrinchus), found throughout tropical and temperate seas worldwide.
Shark teeth vary significantly among species primarily because their morphology is specialized to suit specific feeding habits and prey types. Evolution has refined these structures over millions of years to optimize the efficiency of each shark's unique hunting or foraging mechanism.1
The diversity in tooth shape reflects these varied dietary needs:
- Shearing and Sawing: Predatory sharks, such as the great white, possess teeth adapted for shearing and sawing, which allow them to effectively consume large prey like seals and dolphins.231
- Crushing: Bottom-dwelling species that feed on shellfish are equipped with coarse, pavementlike teeth designed for crushing hard shells.1
- Straining: In contrast, the largest shark species—such as the whale shark and basking shark—do not rely on teeth for hunting; instead, they use specialized gill structures to strain plankton from the water.21
Regardless of the specific shape, all sharks utilize a continuous tooth replacement system, ensuring that as teeth are worn down or lost, new ones from rows behind move forward to maintain their effectiveness throughout their lives.4