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Interesting hitchhiker, what is it?


Mr. Fosi

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This came in on a piece of aquacultured rock from the gulf.

 

zoanthids.jpg

 

zoanthids1.jpg

 

If you see anything else (other than the bubble algae) that you recognize, identify it as well.

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$7/lb.

 

This is a 1.5lb piece of a total 3lbs that I bought. I have two blue leg hermits in the curing tank cleaning the rock off.

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They definitely retract when bothered.

 

Feels like there may be a little something in there... Kinda soft on top and a little stiff further in.

 

Perhaps I should try feeding it something...

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It is definately a coral of some type. There is a hard skeleton that is almost visable when the animal is fully retracted.

 

I also found a second patch of this on the rock. I hope both patches survive and reproduce.

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I looked at that link, but I am sure that it is not a plate or mushroom, since it just doesn't look the same.

 

I also found something else on the rock. I actually noticed it when I was first poking at the cup-coral-like animal. You can see this 'new' discovery in the origional full-monty picture at the beginning of the post as a bulge just below the brown corals and extending left away from the purple macroalgae stalks.

 

It looks like rock, but it is soft and obviously attached. This morning, I noticed a hole in it, so I poked it and the hole (mouth?) closed up. Here is a closer pic of it:

 

unknown%20p.jpg

 

 

 

Doesn't look much like a sponge, and I doubt a grown sponge would have survived the 12hr dry flight from Florida. It doesn't move, so it probably isn't a cucumber.

 

It actually looks like there could be another closed mouth to the left of the open one...

 

Yaddya think?

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I think your rock looks very cool.

more organic and less 'chunk of rock in water'.

heres to all kinds of things popping out of there.

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I think Icy meant you should follow the links in that thread to cup coral/tube coral threads. I can't really make out your picture clearly, but here's a link to a Reefs.org thread about hitch hikers that has some great pictures in it. Go to pages 2 & 3 of this thread and scroll down to the cup coral/tube coral pics to see what they look like.

 

http://www.reefs.org/phpBB2/viewtopic.php?...der=asc&start=0

 

I also can't really make out the second critter you mention, but from your description it sounds as if it could be a tunicate. They are frequent hitch hikers and come in an enormous variety of colors and sizes (mine were transparent). I don't have any good tunicate links but you should try searching for images of them. Here is a link to a Shimek article that has a few pics:

 

http://www.reefkeeping.com/issues/2005-03/rs/index.php

 

HTH,

 

--Diane

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I agree with Diane, the second mystery creature is probably a tunicate. The fact that it (probably) has two openings (inhalent and exhalent siphons) and is responsive to external stimulus points to this rather than a sponge of some sort.

 

If you want to check out some wonderful pictures of squirts then go here. You may find an ID there but probably not. I wish that they were easy to keep in captivity as I find them truely amazing creatures.

 

Best regards

 

Ann

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Nope.

 

Should I be proud?

 

The other day, I was messing around with some live rock that I'm curing.....and I moved a chunk of rock and a dead bristleworm floated onto my arm.......I jumped. :o

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Great links Diane & Ann!

 

I found something that looks exactly like what is on my rock on that first link. I guess the corals are a Madracis sp. They are apparantly a zooxanthellate, which is very cool, since I didn't want to have to feed them. The SEM pic of the individal corallite in this link looks a lot like the ones on my rock when they retract.

http://eusmilia.geology.uiowa.edu/database...at/mirablis.htm

 

I didn't see anything on the tunicate links that looks like what is on my rock. I wish I could get a better picture, but I would need a better camera to do that.

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That's funny, I scrolled right by that Madracis pic, I was so intent on finding the cup & tube coral shots! You're right, it looks very much like what you have. Sounds like a pretty cool hitch hiker! And it sounds like you've already done some research on it. Let us know what you find out.

 

--Diane

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First seems to be a Cup Coral, and I agree with Ann on the second.

 

Gulf Aquaculture is some of the best live rock I've ever seen.

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Many of the corals in the phylum Madracis were described and named in the mid-late 1800s.

 

A brief classification listing:

 

Order Scleractinia

Class Pocilloporidae

Phylum Madracis

Species

pharensis (Heller, 1868)

pharensis forma pharensis Wells, 1973

sendaria

mirabilis (Duchassaing & Michelotti, 1861)

carmabi

formosa Wells, 1973

kerbyi

asperula

senaria Wells, 1974

decactis

myriaster (Milne Edwards & Haime, 1849)

asanoi

brueggemanni (Ridley, 1881)

hellana

interjecta

kauaiensis Vaughan, 1907

myriaster (M. Edwards & Haime, 1849)

profunda Zibrowius, 1980

singularis Rehberg, 1892

asperula Milne Edwards & Haime, 1850

decactis (Lyman, 1859)

hellana M. Edwards & Haime, 1850

 

A German site that has a good coral database w/photos:

http://www.meerwasser-lexikon.de/eng/0/0/0/index.htm

 

Good list of stonies and LPS:

http://64.233.179.104/translate_c?hl=en&sl...cial_s%26sa%3DG

 

Neat searchable database that has no pictures:

http://hercules.kgs.ku.edu/hexacoral/dev/valid_species.cfm

 

Various sites displaying pictures of different Madracis species:

http://coexploration.org/bbsr/coral/html/body_madracis.html

http://whelk.aims.gov.au/coralsearch/html/...20pages/682.htm

http://www.meerwasser-lexikon.de/de/94/123...is/sendaria.htm

 

So far, what I have looks most like Madracis sendaria. I am searching for a good online way to key out this species, but I don't expect to find one.

 

Anyone know of any good coral idetification keys or books that would otherwise assist me in figuring out which Atlantic coral I have?

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  • 3 weeks later...

Mr. Fosi,

 

Since this thread's been resurrected, I'd just like to let you know that I enjoyed visiting the sites you posted, and have saved several. BTW, do you read German?

 

How's the Madracis doing?

 

Regarding coral ID, I don't think there are many, if any, keys available to us hobbyists. It's just such a big area, and the demand for any particular taxon is relatively small. You could try posting a query to Eric Borneman's Coral Forum at Marine Depot and see if you get any more info:

 

http://www.marinedepot.com/FORUMS/Forum9-1.aspx

 

--Diane

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IAmANanoReefer: If it grows enough to frag, you may certainly have some.

 

Diane: Very cool. Glad to have helped.

 

Sadly, I do not read German. There are so many good German reefing sites that it is almost worth learning the language just for them.

 

The Madracis is doing very well. I found a second colony of it on the rear side of the rock and I have found a few small (~1mm) polyps elsewhere on the rock. I noticed one of the small polyps grab some of my fish food a few nights ago, so I decided to try target feeding the two larger 4-7 polyp colonies. They were very interested in the food and had it consumed in under 10min.

 

I agree that keys are virtually impossible to find, which is evidenced by the lack up updates to this thread. I did see a quick reference guide to corals at one of my LFSs last night and I found Madracis in it. The book said that it was to be pronounced mad-RAY-sis, whereas I had been calling it maad-RA-sis.

 

According to this book, their range is all through the mid-Atlantic and there are some in the western Pacific. I thought this distribution pattern interesting from a biogeophraphical standpoint. Those two areas are about as far from one another as you can get and still be on this planet.

 

The book also claimed that Madracis species:

1) Prefer rather intense lighting

2) Will consume phyto/zooplankton as well as fish feces and marine snow

3) Are relatively unagressive

4) Are fairly easy to keep and maintain in an aquarium

 

They apparantly will grow in large, flat-surface, rather bulbous colonies as well as in large spherical to hemispherical colonies with many finger-like projections.

 

I am not currently a memeber of marinedepot, but I will check out the link and see if it is worth giving them some of my information.

 

Here are some better pics:

 

Madracis%20HL%20p.jpg

 

Madracis%20spot%20p.jpg

 

3-24-06%20medracis%20p.jpg

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