It has been informally named "Casper" because it is cute and pale and translucent, like a friendly lil ghost, and we do know a few things about it.It lays its eggs on the stems of dead sea sponges ...

It may surprise you to know that the world is full of ghosts. Not the specters of the deceased lingering long after their bodies have gone – but a number of pale, creeping, shy animal species ...