Heteroxenia?

gflat65

New member
How many Xeniids out there have non retractile polyps? I think I found some Heteroxenia on an Aussie Prism Favia I got from Casey. The polyps do not retract, but tend to fold over on themselves. The stalk kinda looks like a toadstool with full Xenia polyps coming out of the top. I've got a top down, but nothing that shows the stalk. This one had to come from Aussieland, because I don't think Casey had anything besides Aussie corals in his tanks.

Odd-Aussie-Xeniid.jpg
 
Took some more because a number of people on another forum said Anthelia. These pics should eliminate that as an ID, I think.

Hetero04.jpg

Hetero03.jpg

Hetero02.jpg

Hetero01.jpg
 
No... I've got to get some bleach so I can melt some of the tissue away and look at the sclerites. I plan to do the same for my softies, but just realized yesteray that we had run out of bleach...
 
Gary- I'm not sure exactly what you're looking at that is different from a standard xenia. Can you take another shot at explaining. I've never seen any of my xenia retract into the main stalk and other than the feathery part on the tips (which look a little more sparse than the xenia I have) it looks pretty much the same to me. Of course, I'm just imagining I'm looking at the wrong thing.
 
Meisen had spoken to me at the MTRC swap and mentioned that he was looking for true Heteroxenia and that many say they have it, but don't actually have Heterxenia. I didn't realize they were hard to find or really different than regular ole Xenia (and maybe they aren't). I don't have any other types of Xeniids except for Cespits, so I couldn't compare this one to the any others.

When I've seen Heteroxenia listed, statements like "Looks like a toadstool banged a Xenia and had offspring" usually accompany it. This one seems to have a stalk like a toadstool (kinda flat on top) any the polyps come from the flat part of the stalk. If for no other reason, since it is apparently relatively easy to get a general idea of Genus by bleaching superficial tissue and inspecting the sclerites, I figured I'd become a bigger nerd and start classifying anything I can to genus level instead of crappy common names.

I plan to do all of my softies to see what I get. Nephthea are supposedly almost never actually in tanks. I have somethign I've been calling Nephthea for a while, so it falls in line with this 'experiment'.

People have shown me Heteroxenia on stocklists, but they can never get one in when they order it for some reason. Some of the reading I've done sounds like any pulse coral could be a Hetero, so they are probably nothing special (unless I'm missing something). Meisen is a collector like me, so when he mentioned it, I thought maybe there was some widely incorrect descriptions of them or something. The one in the pics looked a little different to me when I noticed it, so I thought I'd try to classify it...
 
Gary,

Gotcha. I've had two types of "xenia." One looks a lot like yours in the pic. The other would grow really long flowy stalks and fall all over itself. After it grew into a colony it actually probably "encrusted" as much as it grew stalks with the polyps on it.

Of the xenia that looks most like yours, it definitely stays a lot shorter and the stalks more or less grow independently. The one thing that looks different, as I said, is that the feathery parts are a little thicker looking and there seems to be more polyps coming vertically out of the "head." I know from experience that they just clamp up when they are angry and don't actually retract like the other xenia I have.

I always assumed they were just regional variants, but it would make sense that the two I had might be classified as different species.

Good luck in your nerdy quest and let us know what you find out.
 
:) Let us know what you come up with...intruguing looking coral at least. The other IDing characteristic from what I understand is that there are smaller polyps of a different structure interspersed within the larger ones on adult specimens of true Heteroxenia. Its not exactly clear to me what the function is of these secondary polyps even is or what they look like exactly, perhaps someone can chime in?
 
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