What In Tarnation Am I?

When Larry, Nancy and One of Three said that last week's bizarre creature was the cucumber, I had to laugh. If the sea had cucumbers, I reckoned, then I'm sure the Pacific is also filled with fava beans and wonderful aged bottles of Chianti. Oh look, the sea is like a giant buffet, could you pass the butter, please? Now I wish I could take that laugh back, because those monster-knowing folks were correct, last week's creature was the sea cucumber.

This week will be different, I'll be amazed if anyone will be able to guess what this odd looking beastie is. Here's some info in case you may have an inkling:

It has a tubular, segmented body lined with chaetae, small appendages that aids with its mobility. As it does not move outside its tube, it does not have any specialized appendages for movement or swimming.

The most distinct features are the two "crowns" that are shaped like Christmas-trees. These "crowns" are actually highly modified prostomial palps which are specialized mouth appendages. Each spiral is actually composed of feather-like tentacles called radioles, which are heavily ciliated which allows any prey that are trapped in them to be transported straight towards the mouth. While they are primarily feeding structures, it also uses its radioles for respiration. It is because of this that the structures are commonly called "gills".

It sounds sexy enough. Ya, good luck with that.

So, What in Tarnation Am I?