please help me to identify this coral

[bichocr]

106647

Thanks

[parrthed]

Looks like a deflated Amplexidiscus fenestrafer (giant cup) mushroom to me.

[Apercula]

I agree its most likely amplexidiscus, how large is it? Larger specimens have a fairly distinct band around the outer rim of the disk, but it takes a while for the band to form.
Amplexidiscus get very large, and are capable of eating fish especially clowns and perching fish like hawks, gobies, and blennies.

My amplexidiscus, the day I got it, mostly deflated, showing the band I mentioned.
http://i263.photobucket.com/albums/ii150/Ganrin/eejuly2at830am.jpg

At its largest, about 16inches in diameter.
http://i263.photobucket.com/albums/ii150/Ganrin/giantcupaug2.jpg

[bichocr]

thanks for your anwsers.

maybe it is 4 inches. Look this another pic
106832