Line art drawing of a dogfish.
Date
Source Archives of Pearson Scott Foresman, extracted from https://commons.wikimedia.org/wiki/File:PSF_D-260004.png
Author Pearson Scott Foresman
Source: https://commons.wikimedia.org/wiki/File:Dogfish_(PSF).png

The spiny dogfish, spurdog, mud shark, or piked dogfish (Squalus acanthias) is one of the best known species of the Squalidae (dogfish) family of sharks, which is part of the Squaliformes order. It is found mostly in shallow waters and further offshore in most parts of the world, especially in temperate waters.