Hagfishes [Myxinidae]
Description
Myxinidae, the only family within the order Myxiniformes, represents the hagfishes, which are jawless marine fish known for their eel-like shape and the production of slime. They have elongated bodies, with paddle-like tails and no scales or paired fins. Hagfishes have a unique defense mechanism against predators and stress, secreting copious amounts of slime. They possess a skull made of cartilage but lack vertebral columns, making them unique among vertebrates. Myxinidae are scavengers, feeding on dead or dying fish, and have the ability to absorb nutrients directly through their skin. They have a simple, rudimentary eye that senses changes in light but cannot form images. Found in cold ocean waters worldwide, these creatures play a significant role in ocean ecosystems by recycling nutrients from dead animals.