Answer:
The key differences between the Atlantic hagfish and the gulper eel are their size, methods of feeding, and habitat. The Atlantic hagfish is described as a "part eel, part sea snake" whereas the gulper eel is described as a "part eel and part giant pouch," indicating that the hagfish is more snake-like, while the gulper eel is more pouch-like; the hagfish is also typically smaller than the gulper eel, which can reach up to six feet in length. The hagfish feeds by "locat[ing] and latch[ing] on to a victim" with its razor-sharp teeth, and then "eat[ing] its prey from the inside out," while the gulper eel has a "pouch-shaped mouth [that] can open quite wide to gulp prey," such as small crustaceans, shrimp and other sea creatures. Lastly, the hagfish lives in deep sea depths of up to 5,600 feet, while the gulper eel "swim[s] through...prey groups with its mouth wide open."