SQUALIDAE
Squalidae
Squalidae, also called dogfish sharks or sometimes spiny dogfishes, are a family of sharks in the order Squaliformes. They have two dorsal fins, each with smooth spines, but no anal fin and their skin is generally rough to the touch. Unlike virtually all other shark species, dogfish sharks possess venom which coats their dorsal spines – this venom is mildly toxic to humans.The above text is a snippet from Wikipedia: Squalidae
and as such is available under the Creative Commons Attribution/Share-Alike License.