What In Tarnation Am I?

When your child asks to dress up as something scary this Halloween, I suggest outfitting him/her in a costume of this creature. Guaranteed to haunt your dreams. I've never heard of this creature, but there sure is a lot of information on it, such as:

Found most often at depths of 200-6000 meters in tropical and subtropical waters of the Atlantic, Pacific and Indian Oceans. They grow from 2.8 cm to nearly 2 feet. Their large, tubular eyes collect the faintest of light and focus well on targets both close and far. The eyes are permanently fixed gazing upwards. They undertake nightly migrations en masse, from depths of 3,600 metres to the upper 50-100 metres of the starlit water column. There they feed throughout the night, returning to the depths by daybreak. Their prey consists primarily of tiny copepods, amphipods, ostracods, euphausiids and other fish.

Sounds like a garden variety vampire, if you ask me.

Although I have never heard or seen a thing about these little fella's before in my life, maybe you have. Which begs the question: What In Tarnation Am I?