Bramble shark

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enlarged, thorn-like denticles scattered over the body (the group's scientific name means "hedgehog shark")

five pairs of gill slits

two spineless dorsal fins, located far back on the body (the first arising behind the origin of the pelvic fins)

lack of an anal fin

ovoviviparous

exclusively marine, inhabiting deep water from cool temperate to tropical zones of the eastern Atlantic, Pacific, and Indian oceans

a single genus (Echinorhinus) in the family Echinorhinidae