Whale sharks, the largest fish species on Earth, can grow to more than 55 feet, while dwarf lantern sharks reach a mere eight inches.įormidable predators, sharks have mouths lined with multiple rows of individual teeth that fall out and grow back on a routine basis. Species in this subclass have skeletons made from cartilage, not bone, and have five to seven gill slits on each side of their heads (most other fish have only one gill slit on each side), which they use to filter oxygen from the water. Like rays and skates, sharks fall into a subclass of fish called elasmobranchii. The ocean’s top predators have evolved into roughly 500 species that come in all different sizes and colors and have varying diets and behavior. Sharks star in blockbuster movies as blood-seeking villains, but in reality they’re far more fascinating and complicated than they’re often depicted in pop culture.īased on fossilized teeth and scales, scientists believe that sharks have been around for more than 400 million years-long before the dinosaurs.
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