Tiny Taiwan fossil - sea urchin?

[FF7_Yuffie]

I found this last weekend, but had it put aside until now. It is from the miocene marine outcrops of the Dahan River. Now, this is tiny--we are talking 2mm in diameter. It's something, it stands out among the rock. But I am not sure if it is an extremely small sea urchin or not. I hope the pictures help. It was tricky to take a picture of because of its size. It's small, circular, with tiny ridges on each side.

[Ludwigia]

Yes, it could very well be a tiny regular sea urchin, but it's hard to judge since the pixels are getting in the way. I think you need a strong microscope.

[pachy-pleuro-whatnot-odon]

Yup, globular with segmentation and a hole at the top - looks like a microscopic sea urchin to me, though it's hard to tell whether it's got the required five-fold symmetry or not... As Roger said, strong magnification will likely be needed to confirm...

 

Nice find! I know how tricky it has been for you in Taiwan to find some decent fossils

[FF7_Yuffie]

Awesome. I was hoping it was. Sea Urchins are rare here, and a tiny one, I expect is even rarer lol.

 

I do have a stronger magnifier on order (this one is x500, the new one is x1000 and something). I'll do a pic when I get it, just to double check. 

 

Thanks for taking a look.

[caterpillar]

I don't think it's an echinoid.

Maybe a little sponge