Bullhead shark

A member of Heterodontidae, a family of small bottom-dwelling sharks with blunt heads, ridged teeth, and two dorsal fins bearing spines.

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Heterodontidae: A family of sharks distinguished by blunt heads, varied tooth shapes, and spines before both dorsal fins. Bullhead sharks are the living members of this family.
Durophagy: A feeding strategy based on eating hard-shelled or otherwise tough prey. Broad rear teeth let many bullhead sharks crush mollusks and crustaceans.
Port Jackson shark: An Australian bullhead shark with harness-like markings and spiral egg cases. It is a well-studied Heterodontidae species known for seasonal migrations to breeding grounds.
Catshark: A diverse group of small sharks in the family Scyliorhinidae, many of which live near the seafloor. Catsharks share bottom-dwelling habits but lack the characteristic dorsal spines of bullhead sharks.
Shark: A cartilaginous fish in the group Selachimorpha, with multiple gill slits and a skeleton made mainly of cartilage. Bullhead sharks belong to this broader group of fishes.
Spiral egg case: A spiral-shaped capsule that protects the developing embryo of some sharks and rays. Female bullhead sharks attach distinctive spiral egg cases to rocks or seaweed.
Horn shark: A bullhead shark native to coastal waters of the eastern Pacific. Its stout body and prominent dorsal spines typify the family's recognizable form.
Dogfish: A common name for several small shark groups, including spiny dogfish in the family Squalidae. Spiny dogfish have dorsal spines but differ in body form and family relationships.
Dorsal fin: A fin on the back of an aquatic animal that helps stabilize and steer it. Bullhead sharks have two dorsal fins, each preceded by a spine.
Oviparity: Reproduction in which embryos develop in eggs laid outside the parent's body. Bullhead sharks lay eggs rather than giving birth to live young.