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Sharks and dogfishes differ from skates and rays by

1. Their pectoral fins distinctly marked off from cylindrical bodies
2. Gill slits are ventrally placed
3. Head and trunk are widened considerably
4. Distinct demarcation between body and tail

Correct answer: Their pectoral fins distinctly marked off from cylindrical bodies

Solution

Sharks and dogfishes have a more cylindrical body with pectoral fins that are clearly separate from the body. In skates and rays, the pectoral fins are expanded and fused to the head and trunk, creating a flattened disc-like shape.

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