Coral or not coral ?

[fifbrindacier]

I wondered what could be that little one (about 1 cm), i found last year in the Bathonian of Normandy. A coral, maybe a sponge ?

I've took the best photos i could.

Edited May 18, 2023 by fifbrindacier

[rocket]

first moment I thought it could be a sponge (like Porosphaera), but think it is not this genus

Could you describe the fine structures (there are some small round structures to be seen)

do not think it is a coral

[fifbrindacier]

3 minutes ago, rocket said:

first moment I thought it could be a sponge (like Porosphaera), but think it is not this genus

Could you describe the fine structures (there are some small round structures to be seen)

do not think it is a coral

Well, i couldn't take good enough pics of them, but they have a polygonal shape. I also thought sponge at first, but then, i found this Site and thought thrn it could be a very worn coral, like the Allocoeniopsis Lucien suspendu they show.

[Tidgy's Dad]

Pretty sure it's not a coral, possibly a sponge, but have you considered worn echinoid? 

That hole at one end could be the anus? 

[Mahnmut]

20 minutes ago, Tidgy's Dad said:

 

That hole at one end could be the anus? 

Now thats comparative anatomy in a nutshell!

[fifbrindacier]

1 hour ago, Tidgy's Dad said:

Pretty sure it's not a coral, possibly a sponge, but have you considered worn echinoid? 

That hole at one end could be the anus? 

Yes, i considered this also, its shape and that little hole are why i picked it up.

Edited May 18, 2023 by fifbrindacier

[fifbrindacier]

Here are better pics.

 

 

 

Edited May 18, 2023 by fifbrindacier

[oyo]

In the first photo of the last message, calyxes, columellas and septa appear to be visible. I would say it is a coral.

[fifbrindacier]

Yes, that was one of the possibilities.

I'll stick to that opinion, though à very worn echinoid can still be a good candidate.