ID for this polyp please? (picture included)

[XrayGuy]

Would anyone be able to tell me what this polyp is? It extends the white dots all over the place at night, but most of the time it sits like in the picture. I have a couple of other single polyps of the same thing on 2 other parts of the same rock. Thanks in advance for the help!

 

[saltygeek]

Looks like a mushroom coral but could be a zoanthid

 

[MechEng99]

I'm guessing a Psuedocorynactis spp. (aka orange ball anemone). You'll probably get more help on ID if you post this in the corallimorpharian or anemone forum (the line on pseudocorynactis is kinda blurred to me). The fact you have a few others elsewhere on the same rock really makes me suspicious that it is a psuedocorynactis - mushrooms/zoanthids usually live more colonial.

 

[returnofsid]

I'm guessing a Psuedocorynactis spp. (aka orange ball anemone). You'll probably get more help on ID if you post this in the corallimorpharian or anemone forum (the line on pseudocorynactis is kinda blurred to me). The fact you have a few others elsewhere on the same rock really makes me suspicious that it is a psuedocorynactis - mushrooms/zoanthids usually live more colonial.

I definitely agree. Pseudocorynactis caribbeorum

They're actually a cold water species, that've been appearing with high frequency, as reef tank hitchhikers lately.