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Chondrichthyans (Sharks, Rays,<br />

and Their Relatives)<br />

• Chondrichthyans (Chondrichthyes)<br />

have a skeleton composed primarily of<br />

cartilage<br />

• The cartilaginous skeleton evolved<br />

secondarily from an ancestral mineralized<br />

skeleton<br />

• The largest and most diverse group of<br />

chondrichthyans includes the sharks,<br />

Video: Shark Eating Seal<br />

rays, and skates<br />

Video: Manta Ray

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