The rare Yago Shark, never before filmed. (credit: Walla) The Yago shark is from the ancient Hexanchidae family, characterized by having six gill arches instead of the five that are typical for ...

The Yago shark is from the ancient Hexanchidae family, characterized by having six gill arches instead of the five that are typical for most shark species. It usually lives at depths of 200 to 600 ...