The family Squalidae refers to a group of sharks commonly known as dogfish sharks. These sharks are found in oceans all over the world and have been around for millions of years. Synonyms for the family Squalidae include the roughsharks, sleeper sharks, spiny dogfish, and longnose sharks. They are known for their sharp spine on the dorsal fin and their ability to survive in deep waters. While some species of dogfish sharks are commonly used for food, others are at risk due to overfishing and habitat destruction. Despite their fierce reputation, dogfish sharks play an important role in maintaining the balance of marine ecosystems.