The broad nose Seven Gill Shark, as the name suggests, has seven gill slits on each side of its body, ahead of the pectoral fin. Although it is not considered dangerous, it has attacked humans in captivity, and has been implicated in a a number of non-fatal attacks in the wild. The shark grows to 3m in length and is silver grey to brown above, white below, with black and white speckles on the upper body and fins.
Seven gill sharks are amongst the most primitive of modern sharks, and belong to the order Hexanchiformes - members of this order have 6-7 gill slits, a single dorsal fin, and no nictitating membrane in the eye.
Now we need Scott to add something about catching them from a yak!