Black dogfish to the clade formed by the granular dogfish ("C. granulatum") and combtooth dogfish ("C. nigrum"). The black dogfish is a common species, with a wide but discontinuous distribution in the temperate waters of the Atlantic Ocean; its range abuts, but does not extend into, the Arctic Ocean. In the northeast, it occurs from Iceland to Sierra Leone, including the Faroe Islands, southern Norway, and the Rockall Trough and Porcupine Seabight off Ireland. In the northwest, it is found from southern Greenland and Baffin Island to Virginia, being particularly abundant in the Laurentian Channel, and may occur further south to the
Rockall Rockall" sailing race, sponsored by Galway Bay Sailing Club, runs from Galway, Ireland, around Rockall and back. It was held in 2012 to coincide with the finish of the 2011–12 Volvo Ocean Race around the world. The 2015-2016 Clipper Round the World Yacht Race race 12 from New York to Londonderry was extended around Rockall despite previous promises to crew from Sir Robin Knox-Johnston that this would not happen again after the race to Danang. In 2017, the Safehaven Marine team led by Frank Kowalski set a world record for the Long Way Round Circumnavigation of Ireland via Rockall island.