Can ANYONE guess this creature?!
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Can ANYONE guess this creature?!

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Can ANYONE guess this creature?!
Old 04-11-2014, 06:53 PM   #1
 
Can ANYONE guess this creature?!

It pops straight up out of the live rock and stays that way until something comes near it. It looks hard (calcerous) and NEVER leaves that position. It is either up 1/2" or flat against the surface of the live rock.

My best guess is it is a Mollusca Phylum -- one that is hard skinned but has no shell with a worm like body. I thought maybe Annelida in the Polychaeta class but nothing seems to come close in appearance.

Any body have ANY knowledge on what this "jack-in-the-box" thing is?! NO ONE has a clue -- no one at ANY LFS can even guess. C'mon, I wanna be impressed.

View 1: Side view up (about the size of a nickel)
View 2: Side view down (completely invisible even down to the calcerous algae)
View 3: Front view up (or at least coming back up)
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Old 04-11-2014, 07:17 PM   #2
 
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Pictures arent clear enough to get a good look at it.
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Old 04-12-2014, 12:20 AM   #3
 
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Originally Posted by Tazman View Post
Pictures arent clear enough to get a good look at it.
That's the challenge -- I can't get any better pictures of it. I guess I could try my wifes pro-level camera but it will still not get much better. It would be nice to get the 45 degree angle shot but it is in-between 2 rocks, almost like a cave and sits right at the corner of the tank.

Still, it should be enough to get some kind of read on what it is -- I can't find anything and I don't have many Phylums left to cover. Those pics are pretty much as good as it gets.....
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Old 04-12-2014, 10:33 AM   #4
 
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I have to agree even in your other thread I cannot quite see any detail of what I am looking at. I will usually use a macro lens or setting when I need to get good close ups of small creatures.I also take 10+ pictures so I have the right shot. Aquatics photography can takes some work some times.
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Old 04-13-2014, 04:00 PM   #5
 
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Originally Posted by badxgillen View Post
I have to agree even in your other thread I cannot quite see any detail of what I am looking at. I will usually use a macro lens or setting when I need to get good close ups of small creatures.I also take 10+ pictures so I have the right shot. Aquatics photography can takes some work some times.
I've taken easily 30+ pictures using a Macro and it just is in a very difficult spot -- bad lighting, small creature, under an overhang in a 2 inch crevice so difficult to focus and the best angle is from the corner of a acrylic tank which is not possible to shoot from.

I'll put a another front and side shot in but I'm not sure it is a ton better -- it takes a little work to see. I'm hoping based on the animal's behavior (simply goes up as shown, and goes down very quickly -- NOTHING else), the basic visual and lack of mobility would lead to some potential discussion of possibilities..... but again, probably not too many botanists on here.
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Old 04-14-2014, 05:25 PM   #6
 
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Feather Duster?
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Old 04-15-2014, 09:46 PM   #7
 
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Feather Duster?
Maybe a rare form but I don't think it is an Annelida, I think it is Mollusca -- I don't have all the notes with me due to the paper bomb called taxes. It may be a form of worm snail but that still doesn't seem right.

I'll try to download the new pictures I took today with some high powered lights and different angles -- I almost wish I could draw a picture -- I have a shot I need to review from almost the top (the overhang is less than 1/2 " so this is tricky). It looks somewhat like a reverse horseshoe from the top (but closed) with an opening at the U end -- it looks like it has 2 horns from the side but it doesn't from the front -- it is opens a triangular "mouth" as it comes up to filter feed, and it collapses inward as it pops back in (think of a pie with a slice taken out that closes on the opening). It never moves -- I look at the tank almost every night with a flashlight and it stays home. It also appears Calcerous -- I can't see any soft parts that I can tell.

Today may have given another clue, I believe it released a stringy substance with some tiny particles from it's opening.

It's actually driving me nuts -- I can't find anything that looks like this thing or has a similar description of behavior except the worm snails -- and they form tubes. This guy has possibly been in this tank for up to 10 years and is imbedded in the same spot in the live rock.

I also wish I could cirlce it on the picture. It is more dime size than nickel sized.
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Old 04-15-2014, 10:04 PM   #8
 
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Like a Vermatid snail?
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Old 04-16-2014, 11:08 PM   #9
 
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Like a Vermatid snail?
Yea -- it looks closer to some of those species but not quite it -- I think it is in the class Aplacophora. The descriptions and behaviors are almost spot on -- chitonous exterior but no shell. Stays burrowed and is worm like -- no external features such as eyes.

Here are the latest shots I took -- they look better alittle smaller but I can see more with the pictures than the naked eye so I am not sure there is really much more to see without yanking it out. You can see a little piece of sand or detritious coming out of it's opening.

pic 1: what it looks like at a distance from the frront
pic 2: same shot but much closer -- looks like you can see some sort of upside y-shaped feature in it
pic 3: side shot again but hopefully somewhat clearer
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