ID this nocturnal hitchhiker

[justinl]

Can't really make anything out in the pictures, but you've described a barnacle. They're arthropods and are harmless filter feeders. Imagine a shrimp in a box (that is actually its nose believe it or not!) that feeds by sticking its legs out and sweeping them in to its mouth.

[Albertan22]

Pictures are hard to make out, but +1 on the barnacle ID based on what you've described.

[ScubaSteve]

Haven't had enough wine yet to make sense of the pictures but I'm giving a +1 on barnacle (the 'half feather duster' and the in and out are a give away).

[nlreefguy]

impossible to tell from the pictures.... need some better ones

[born]

ya i myself think its a barnacle now. I did some more research and watched him for over 30 minutes last night lol