Hey guys an ID on "crustacean" if i could?

[Saltliquid]

This is one of many that were living in algae that I got a few miles out to sea and they are mainly of one segment, but this large one was a multiple.
It is around one mill across by 6 mill long.
It moves by dragging it self along or the head acts like a tail but by pulling not pushing through the water.
Any one got any ideas?

 

[Betta132]

It almost looks like a weird skeleton shrimp... is it like a weird worm?
Dude, WHERE do you get all these weird things for us to ID?

 

[Calappidae]

Possibly an eucinid worm? The head looks like one but the behavior doesn't sound the same.

 

[Saltliquid]

Hey guys the body of these is hard like a stick and all that you could say are its head and tail retract to with in and it gets along by its extending and flipping pulling it along in very small amounts at a time, well dragging it along and that is its way of walking you might call it as well, but that just drags it along.
I find these things when diving and I dive a lot, usually like this one, these came out of some algae I brought home.
Out of a fist sized section of the algae there would have been 30 to 50 came out in the bowl.
I have been diving for over 40 years and collecting for 36 years.

 

[Saltliquid]

More pics of them.

 

[Betta132]

Sounds almost like a caddisfly larva... they build/locate little houses that they drag around on their bodies, sort of like if a hermit crab built its own house. Those are river creatures, though.

 

[Saltliquid]

The thing is these things are part of that log like body, they have around their head and tail retraction wrinkles, like a turtle has on its neck.

 

[LeslieH]

It's an amphipod. Many species build tubes and some in family Ischyroceridae build these caddis-fly-like tubes.

Scroll down to see the Cerapus tubularis pic
http://www2.mmbs.s.u-tokyo.ac.jp/sbnet/top_photo.html

 

[Saltliquid]

It's an amphipod. Many species build tubes and some in family Ischyroceridae build these caddis-fly-like tubes.

Scroll down to see the Cerapus tubularis pic
http://www2.mmbs.s.u-tokyo.ac.jp/sbnet/top_photo.html

Thank you LeslieH, much appreciated.