The Californian Horn Shark (Heterodontus francisci) is a small species of shark in the Heterodontidae family of bullhead sharks.
The Californian Horn Shark is grey or brown with many small dark spots over its cylindrical body. The spots may be absent in older sharks. It has a short, wide head and a blunt snout. It has two lateral ridges, one over each eye from the back of its head to its snout, stopping abruptly. It has two high dorsal (back) fins with large spines. Its nostrils are split into two openings – one for inflowing water and the other opening for outflowing water. Its mouth is small and curved with prominent furrows at the corners. Its teeth are small and pointed.
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