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The cookiecutter shark (Isistius brasiliensis), also called the cigar shark, is a species of small dogfish shark in the family Dalatiidae. This shark occurs in warm, oceanic waters worldwide, particularly near islands, and has been recorded from as deep as 3.7 km (2.3 mi).

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Digital pen and ink illustration of a dogfish shark dissection. This section highlight the digestive system. The inset overviews the gill arteries.

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from Etsy

Porbeagle, Bull Shark, Sandy Dogfish, White Shark, etc. Vintage 1984 Fish Book Plate

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from ScienceDaily

How sharks recycle toxic ammonia to keep their skin moist

The Pacific spiny dogfish shark is a master at recycling the ocean’s toxic ammonia and converting it into useful urea, according to new research.