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any of about four species of long-snouted marine sharks of the family Pristiophoridae. Saw sharks are found off South Africa, Australia, and eastern Asia and are characterized by a long, slender, sawlike snout equipped with sharp, toothlike projections on each edge. They resemble the rays known as sawfishes but have a pair of barbels on the underside of the saw and have gill slits on the sides of the head, not underneath.