Author H L Todd
English: Horned Dogfish - Squalus acanthias, L.
Subject: Spiny dogfish
Tag: Fish
Date 1884
Source/Photographer
English: George Brown Goode (1884) Fisheries and Fishery Industries of the United States: Section I, Natural History of Useful Aquatic Animals, Plates, Washington, DC: Government Printing Office
Source: https://commons.wikimedia.org/wiki/File:FMIB_51157_Horned_Dogfish.jpeg

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.